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Miller" , Thomas Gleixner , Ingo Molnar , Dave Hansen , Jonathan Corbet , Longpeng , Andrew Morton , Mike Kravetz Subject: [PATCH 1/4] hugetlbfs: add arch_hugetlb_valid_size Date: Wed, 18 Mar 2020 15:06:31 -0700 Message-Id: <20200318220634.32100-2-mike.kravetz@oracle.com> X-Mailer: git-send-email 2.24.1 In-Reply-To: <20200318220634.32100-1-mike.kravetz@oracle.com> References: <20200318220634.32100-1-mike.kravetz@oracle.com> MIME-Version: 1.0 X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9564 signatures=668685 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 spamscore=0 bulkscore=0 phishscore=0 malwarescore=0 mlxscore=0 mlxlogscore=999 adultscore=0 suspectscore=2 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2003020000 definitions=main-2003180094 X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9564 signatures=668685 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 malwarescore=0 bulkscore=0 suspectscore=2 lowpriorityscore=0 phishscore=0 adultscore=0 clxscore=1015 impostorscore=0 priorityscore=1501 spamscore=0 mlxlogscore=999 mlxscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2003020000 definitions=main-2003180094 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: The architecture independent routine hugetlb_default_setup sets up the default huge pages size. It has no way to verify if the passed value is valid, so it accepts it and attempts to validate at a later time. This requires undocumented cooperation between the arch specific and arch independent code. For architectures that support more than one huge page size, provide a routine arch_hugetlb_valid_size to validate a huge page size. hugetlb_default_setup can use this to validate passed values. arch_hugetlb_valid_size will also be used in a subsequent patch to move processing of the "hugepagesz=" in arch specific code to a common routine in arch independent code. Signed-off-by: Mike Kravetz Reported-by: kbuild test robot Reported-by: kbuild test robot Acked-by: Mina Almasry --- arch/arm64/include/asm/hugetlb.h | 2 ++ arch/arm64/mm/hugetlbpage.c | 19 ++++++++++++++----- arch/powerpc/include/asm/hugetlb.h | 3 +++ arch/powerpc/mm/hugetlbpage.c | 20 +++++++++++++------- arch/riscv/include/asm/hugetlb.h | 3 +++ arch/riscv/mm/hugetlbpage.c | 28 ++++++++++++++++++---------- arch/s390/include/asm/hugetlb.h | 3 +++ arch/s390/mm/hugetlbpage.c | 18 +++++++++++++----- arch/sparc/include/asm/hugetlb.h | 3 +++ arch/sparc/mm/init_64.c | 23 ++++++++++++++++------- arch/x86/include/asm/hugetlb.h | 3 +++ arch/x86/mm/hugetlbpage.c | 21 +++++++++++++++------ include/linux/hugetlb.h | 7 +++++++ mm/hugetlb.c | 16 +++++++++++++--- 14 files changed, 126 insertions(+), 43 deletions(-) diff --git a/arch/arm64/include/asm/hugetlb.h b/arch/arm64/include/asm/hugetlb.h index 2eb6c234d594..3248f35213ee 100644 --- a/arch/arm64/include/asm/hugetlb.h +++ b/arch/arm64/include/asm/hugetlb.h @@ -59,6 +59,8 @@ extern void huge_pte_clear(struct mm_struct *mm, unsigned long addr, extern void set_huge_swap_pte_at(struct mm_struct *mm, unsigned long addr, pte_t *ptep, pte_t pte, unsigned long sz); #define set_huge_swap_pte_at set_huge_swap_pte_at +extern bool __init arch_hugetlb_valid_size(unsigned long long size); +#define arch_hugetlb_valid_size arch_hugetlb_valid_size #include diff --git a/arch/arm64/mm/hugetlbpage.c b/arch/arm64/mm/hugetlbpage.c index bbeb6a5a6ba6..da30127086d0 100644 --- a/arch/arm64/mm/hugetlbpage.c +++ b/arch/arm64/mm/hugetlbpage.c @@ -462,23 +462,32 @@ static int __init hugetlbpage_init(void) } arch_initcall(hugetlbpage_init); -static __init int setup_hugepagesz(char *opt) +bool __init arch_hugetlb_valid_size(unsigned long long size) { - unsigned long ps = memparse(opt, &opt); - - switch (ps) { + switch (size) { #ifdef CONFIG_ARM64_4K_PAGES case PUD_SIZE: #endif case CONT_PMD_SIZE: case PMD_SIZE: case CONT_PTE_SIZE: + return true; + } + + return false; +} + +static __init int setup_hugepagesz(char *opt) +{ + unsigned long long ps = memparse(opt, &opt); + + if arch_hugetlb_valid_size(ps)) { add_huge_page_size(ps); return 1; } hugetlb_bad_size(); - pr_err("hugepagesz: Unsupported page size %lu K\n", ps >> 10); + pr_err("hugepagesz: Unsupported page size %llu K\n", ps >> 10); return 0; } __setup("hugepagesz=", setup_hugepagesz); diff --git a/arch/powerpc/include/asm/hugetlb.h b/arch/powerpc/include/asm/hugetlb.h index bd6504c28c2f..3b5939016955 100644 --- a/arch/powerpc/include/asm/hugetlb.h +++ b/arch/powerpc/include/asm/hugetlb.h @@ -64,6 +64,9 @@ static inline void arch_clear_hugepage_flags(struct page *page) { } +#define arch_hugetlb_valid_size arch_hugetlb_valid_size +extern bool __init arch_hugetlb_valid_size(unsigned long long size); + #include #else /* ! CONFIG_HUGETLB_PAGE */ diff --git a/arch/powerpc/mm/hugetlbpage.c b/arch/powerpc/mm/hugetlbpage.c index 33b3461d91e8..b78f660252f3 100644 --- a/arch/powerpc/mm/hugetlbpage.c +++ b/arch/powerpc/mm/hugetlbpage.c @@ -558,7 +558,7 @@ unsigned long vma_mmu_pagesize(struct vm_area_struct *vma) return vma_kernel_pagesize(vma); } -static int __init add_huge_page_size(unsigned long long size) +bool __init arch_hugetlb_valid_size(unsigned long long size) { int shift = __ffs(size); int mmu_psize; @@ -566,20 +566,26 @@ static int __init add_huge_page_size(unsigned long long size) /* Check that it is a page size supported by the hardware and * that it fits within pagetable and slice limits. */ if (size <= PAGE_SIZE || !is_power_of_2(size)) - return -EINVAL; + return false; mmu_psize = check_and_get_huge_psize(shift); if (mmu_psize < 0) - return -EINVAL; + return false; BUG_ON(mmu_psize_defs[mmu_psize].shift != shift); - /* Return if huge page size has already been setup */ - if (size_to_hstate(size)) - return 0; + return true; +} - hugetlb_add_hstate(shift - PAGE_SHIFT); +static int __init add_huge_page_size(unsigned long long size) +{ + int shift = __ffs(size); + + if (!arch_hugetlb_valid_size(size)) + return -EINVAL; + if (!size_to_hstate(size)) + hugetlb_add_hstate(shift - PAGE_SHIFT); return 0; } diff --git a/arch/riscv/include/asm/hugetlb.h b/arch/riscv/include/asm/hugetlb.h index 728a5db66597..ebd6f5a35d26 100644 --- a/arch/riscv/include/asm/hugetlb.h +++ b/arch/riscv/include/asm/hugetlb.h @@ -5,6 +5,9 @@ #include #include +extern bool __init arch_hugetlb_valid_size(unsigned long long size); +#define arch_hugetlb_valid_size arch_hugetlb_valid_size + static inline int is_hugepage_only_range(struct mm_struct *mm, unsigned long addr, unsigned long len) { diff --git a/arch/riscv/mm/hugetlbpage.c b/arch/riscv/mm/hugetlbpage.c index a6189ed36c5f..f1990882f16c 100644 --- a/arch/riscv/mm/hugetlbpage.c +++ b/arch/riscv/mm/hugetlbpage.c @@ -12,21 +12,29 @@ int pmd_huge(pmd_t pmd) return pmd_leaf(pmd); } +bool __init arch_hugetlb_valid_size(unsigned long long size) +{ + if (size == HPAGE_SIZE) + return true; + else if (IS_ENABLED(CONFIG_64BIT) && ps == PUD_SIZE) + retrurn true; + else + return false; +} + static __init int setup_hugepagesz(char *opt) { - unsigned long ps = memparse(opt, &opt); + unsigned long long ps = memparse(opt, &opt); - if (ps == HPAGE_SIZE) { - hugetlb_add_hstate(HPAGE_SHIFT - PAGE_SHIFT); - } else if (IS_ENABLED(CONFIG_64BIT) && ps == PUD_SIZE) { - hugetlb_add_hstate(PUD_SHIFT - PAGE_SHIFT); - } else { - hugetlb_bad_size(); - pr_err("hugepagesz: Unsupported page size %lu M\n", ps >> 20); - return 0; + if (arch_hugetlb_valid_size(ps)) { + hugetlb_add_hstate(ilog2(ps) - PAGE_SHIFT); + return 1; } - return 1; + hugetlb_bad_size(); + pr_err("hugepagesz: Unsupported page size %lu M\n", ps >> 20); + return 0; + } __setup("hugepagesz=", setup_hugepagesz); diff --git a/arch/s390/include/asm/hugetlb.h b/arch/s390/include/asm/hugetlb.h index de8f0bf5f238..a3dd457d2167 100644 --- a/arch/s390/include/asm/hugetlb.h +++ b/arch/s390/include/asm/hugetlb.h @@ -15,6 +15,9 @@ #define hugetlb_free_pgd_range free_pgd_range #define hugepages_supported() (MACHINE_HAS_EDAT1) +extern bool __init arch_hugetlb_valid_size(unsigned long long size); +#define arch_hugetlb_valid_size arch_hugetlb_valid_size + void set_huge_pte_at(struct mm_struct *mm, unsigned long addr, pte_t *ptep, pte_t pte); pte_t huge_ptep_get(pte_t *ptep); diff --git a/arch/s390/mm/hugetlbpage.c b/arch/s390/mm/hugetlbpage.c index 5674710a4841..d92e8c5c3e71 100644 --- a/arch/s390/mm/hugetlbpage.c +++ b/arch/s390/mm/hugetlbpage.c @@ -251,16 +251,24 @@ follow_huge_pud(struct mm_struct *mm, unsigned long address, return pud_page(*pud) + ((address & ~PUD_MASK) >> PAGE_SHIFT); } +bool __init arch_hugetlb_valid_size(unsigned long long size) +{ + if (MACHINE_HAS_EDAT1 && size == PMD_SIZE) + return true; + else if (MACHINE_HAS_EDAT2 && size == PUD_SIZE) + return true; + else + return false; +} + static __init int setup_hugepagesz(char *opt) { - unsigned long size; + unsigned long long size; char *string = opt; size = memparse(opt, &opt); - if (MACHINE_HAS_EDAT1 && size == PMD_SIZE) { - hugetlb_add_hstate(PMD_SHIFT - PAGE_SHIFT); - } else if (MACHINE_HAS_EDAT2 && size == PUD_SIZE) { - hugetlb_add_hstate(PUD_SHIFT - PAGE_SHIFT); + if (arch_hugetlb_valid_size(size)) { + hugetlb_add_hstate(ilog2(size) - PAGE_SHIFT); } else { hugetlb_bad_size(); pr_err("hugepagesz= specifies an unsupported page size %s\n", diff --git a/arch/sparc/include/asm/hugetlb.h b/arch/sparc/include/asm/hugetlb.h index 3963f80d1cb3..0d4f4adaffaf 100644 --- a/arch/sparc/include/asm/hugetlb.h +++ b/arch/sparc/include/asm/hugetlb.h @@ -10,6 +10,9 @@ struct pud_huge_patch_entry { unsigned int insn; }; extern struct pud_huge_patch_entry __pud_huge_patch, __pud_huge_patch_end; + +extern bool __init arch_hugetlb_valid_size(unsigned long long size); +#define arch_hugetlb_valid_size arch_hugetlb_valid_size #endif #define __HAVE_ARCH_HUGE_SET_HUGE_PTE_AT diff --git a/arch/sparc/mm/init_64.c b/arch/sparc/mm/init_64.c index 1cf0d666dea3..4cc248817b19 100644 --- a/arch/sparc/mm/init_64.c +++ b/arch/sparc/mm/init_64.c @@ -360,17 +360,13 @@ static void __init pud_huge_patch(void) __asm__ __volatile__("flush %0" : : "r" (addr)); } -static int __init setup_hugepagesz(char *string) +bool __init arch_hugetlb_valid_size(unsigned long long size) { - unsigned long long hugepage_size; - unsigned int hugepage_shift; + unsigned int hugepage_shift = ilog2(size); unsigned short hv_pgsz_idx; unsigned int hv_pgsz_mask; int rc = 0; - hugepage_size = memparse(string, &string); - hugepage_shift = ilog2(hugepage_size); - switch (hugepage_shift) { case HPAGE_16GB_SHIFT: hv_pgsz_mask = HV_PGSZ_MASK_16GB; @@ -397,7 +393,20 @@ static int __init setup_hugepagesz(char *string) hv_pgsz_mask = 0; } - if ((hv_pgsz_mask & cpu_pgsz_mask) == 0U) { + if ((hv_pgsz_mask & cpu_pgsz_mask) == 0U) + return false; + + return true; +} + +static int __init setup_hugepagesz(char *string) +{ + unsigned long long hugepage_size; + int rc = 0; + + hugepage_size = memparse(string, &string); + + if (!arch_hugetlb_valid_size(hugepage_size)) { hugetlb_bad_size(); pr_err("hugepagesz=%llu not supported by MMU.\n", hugepage_size); diff --git a/arch/x86/include/asm/hugetlb.h b/arch/x86/include/asm/hugetlb.h index f65cfb48cfdd..8ed96e4010ec 100644 --- a/arch/x86/include/asm/hugetlb.h +++ b/arch/x86/include/asm/hugetlb.h @@ -7,6 +7,9 @@ #define hugepages_supported() boot_cpu_has(X86_FEATURE_PSE) +extern bool __init arch_hugetlb_valid_size(unsigned long long size); +#define arch_hugetlb_valid_size arch_hugetlb_valid_size + static inline int is_hugepage_only_range(struct mm_struct *mm, unsigned long addr, unsigned long len) { diff --git a/arch/x86/mm/hugetlbpage.c b/arch/x86/mm/hugetlbpage.c index 5bfd5aef5378..51e6208fdeec 100644 --- a/arch/x86/mm/hugetlbpage.c +++ b/arch/x86/mm/hugetlbpage.c @@ -181,16 +181,25 @@ hugetlb_get_unmapped_area(struct file *file, unsigned long addr, #endif /* CONFIG_HUGETLB_PAGE */ #ifdef CONFIG_X86_64 +bool __init arch_hugetlb_valid_size(unsigned long long size) +{ + if (size == PMD_SIZE) + return true; + else if (size == PUD_SIZE && boot_cpu_has(X86_FEATURE_GBPAGES)) + return true; + else + return false; +} + static __init int setup_hugepagesz(char *opt) { - unsigned long ps = memparse(opt, &opt); - if (ps == PMD_SIZE) { - hugetlb_add_hstate(PMD_SHIFT - PAGE_SHIFT); - } else if (ps == PUD_SIZE && boot_cpu_has(X86_FEATURE_GBPAGES)) { - hugetlb_add_hstate(PUD_SHIFT - PAGE_SHIFT); + unsigned long long ps = memparse(opt, &opt); + + if (arch_hugetlb_valid_size(ps)) { + hugetlb_add_hstate(ilog2(ps) - PAGE_SHIFT); } else { hugetlb_bad_size(); - printk(KERN_ERR "hugepagesz: Unsupported page size %lu M\n", + printk(KERN_ERR "hugepagesz: Unsupported page size %llu M\n", ps >> 20); return 0; } diff --git a/include/linux/hugetlb.h b/include/linux/hugetlb.h index b831e9fa1a26..33343eb980d0 100644 --- a/include/linux/hugetlb.h +++ b/include/linux/hugetlb.h @@ -678,6 +678,13 @@ static inline spinlock_t *huge_pte_lockptr(struct hstate *h, return &mm->page_table_lock; } +#ifndef arch_hugetlb_valid_size +static inline bool arch_hugetlb_valid_size(unsigned long long size) +{ + return (size == HPAGE_SIZE); +} +#endif + #ifndef hugepages_supported /* * Some platform decide whether they support huge pages at boot diff --git a/mm/hugetlb.c b/mm/hugetlb.c index d8ebd876871d..2f99359b93af 100644 --- a/mm/hugetlb.c +++ b/mm/hugetlb.c @@ -3224,12 +3224,22 @@ static int __init hugetlb_nrpages_setup(char *s) } __setup("hugepages=", hugetlb_nrpages_setup); -static int __init hugetlb_default_setup(char *s) +static int __init default_hugepagesz_setup(char *s) { - default_hstate_size = memparse(s, &s); + unsigned long long size; + char *saved_s = s; + + size = memparse(s, &s); + + if (!arch_hugetlb_valid_size(size)) { + pr_err("HugeTLB: unsupported default_hugepagesz %s\n", saved_s); + return 0; + } + + default_hstate_size = size; return 1; } -__setup("default_hugepagesz=", hugetlb_default_setup); +__setup("default_hugepagesz=", default_hugepagesz_setup); static unsigned int cpuset_mems_nr(unsigned int *array) { From patchwork Wed Mar 18 22:06:32 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mike Kravetz X-Patchwork-Id: 11446149 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id A03A516C1 for ; Wed, 18 Mar 2020 22:07:13 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 53B9520752 for ; 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Wed, 18 Mar 2020 22:06:53 +0000 Received: from abhmp0008.oracle.com (abhmp0008.oracle.com [141.146.116.14]) by aserv0121.oracle.com (8.14.4/8.13.8) with ESMTP id 02IM6pAc003506; Wed, 18 Mar 2020 22:06:51 GMT Received: from monkey.oracle.com (/71.63.128.209) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Wed, 18 Mar 2020 15:06:51 -0700 From: Mike Kravetz To: linux-mm@kvack.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linuxppc-dev@lists.ozlabs.org, linux-riscv@lists.infradead.org, linux-s390@vger.kernel.org, sparclinux@vger.kernel.org, linux-doc@vger.kernel.org Cc: Catalin Marinas , Will Deacon , Benjamin Herrenschmidt , Paul Mackerras , Paul Walmsley , Palmer Dabbelt , Albert Ou , Heiko Carstens , Vasily Gorbik , Christian Borntraeger , "David S . Miller" , Thomas Gleixner , Ingo Molnar , Dave Hansen , Jonathan Corbet , Longpeng , Andrew Morton , Mike Kravetz Subject: [PATCH 2/4] hugetlbfs: move hugepagesz= parsing to arch independent code Date: Wed, 18 Mar 2020 15:06:32 -0700 Message-Id: <20200318220634.32100-3-mike.kravetz@oracle.com> X-Mailer: git-send-email 2.24.1 In-Reply-To: <20200318220634.32100-1-mike.kravetz@oracle.com> References: <20200318220634.32100-1-mike.kravetz@oracle.com> MIME-Version: 1.0 X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9564 signatures=668685 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 spamscore=0 bulkscore=0 phishscore=0 malwarescore=0 mlxscore=0 mlxlogscore=999 adultscore=0 suspectscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2003020000 definitions=main-2003180094 X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9564 signatures=668685 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 lowpriorityscore=0 suspectscore=0 adultscore=0 bulkscore=0 mlxlogscore=999 priorityscore=1501 clxscore=1015 malwarescore=0 mlxscore=0 phishscore=0 impostorscore=0 spamscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2003020000 definitions=main-2003180094 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: Now that architectures provide arch_hugetlb_valid_size(), parsing of "hugepagesz=" can be done in architecture independent code. Create a single routine to handle hugepagesz= parsing and remove all arch specific routines. We can also remove the interface hugetlb_bad_size() as this is no longer used outside arch independent code. This also provides consistent behavior of hugetlbfs command line options. The hugepagesz= option should only be specified once for a specific size, but some architectures allow multiple instances. This appears to be more of an oversight when code was added by some architectures to set up ALL huge pages sizes. Signed-off-by: Mike Kravetz Acked-by: Mina Almasry --- arch/arm64/mm/hugetlbpage.c | 15 --------------- arch/powerpc/mm/hugetlbpage.c | 15 --------------- arch/riscv/mm/hugetlbpage.c | 16 ---------------- arch/s390/mm/hugetlbpage.c | 18 ------------------ arch/sparc/mm/init_64.c | 22 ---------------------- arch/x86/mm/hugetlbpage.c | 16 ---------------- include/linux/hugetlb.h | 1 - mm/hugetlb.c | 24 ++++++++++++++++++------ 8 files changed, 18 insertions(+), 109 deletions(-) diff --git a/arch/arm64/mm/hugetlbpage.c b/arch/arm64/mm/hugetlbpage.c index da30127086d0..4aa9534a45d7 100644 --- a/arch/arm64/mm/hugetlbpage.c +++ b/arch/arm64/mm/hugetlbpage.c @@ -476,18 +476,3 @@ bool __init arch_hugetlb_valid_size(unsigned long long size) return false; } - -static __init int setup_hugepagesz(char *opt) -{ - unsigned long long ps = memparse(opt, &opt); - - if arch_hugetlb_valid_size(ps)) { - add_huge_page_size(ps); - return 1; - } - - hugetlb_bad_size(); - pr_err("hugepagesz: Unsupported page size %llu K\n", ps >> 10); - return 0; -} -__setup("hugepagesz=", setup_hugepagesz); diff --git a/arch/powerpc/mm/hugetlbpage.c b/arch/powerpc/mm/hugetlbpage.c index b78f660252f3..166960ba1236 100644 --- a/arch/powerpc/mm/hugetlbpage.c +++ b/arch/powerpc/mm/hugetlbpage.c @@ -589,21 +589,6 @@ static int __init add_huge_page_size(unsigned long long size) return 0; } -static int __init hugepage_setup_sz(char *str) -{ - unsigned long long size; - - size = memparse(str, &str); - - if (add_huge_page_size(size) != 0) { - hugetlb_bad_size(); - pr_err("Invalid huge page size specified(%llu)\n", size); - } - - return 1; -} -__setup("hugepagesz=", hugepage_setup_sz); - static int __init hugetlbpage_init(void) { bool configured = false; diff --git a/arch/riscv/mm/hugetlbpage.c b/arch/riscv/mm/hugetlbpage.c index f1990882f16c..bdf89d7eb714 100644 --- a/arch/riscv/mm/hugetlbpage.c +++ b/arch/riscv/mm/hugetlbpage.c @@ -22,22 +22,6 @@ bool __init arch_hugetlb_valid_size(unsigned long long size) return false; } -static __init int setup_hugepagesz(char *opt) -{ - unsigned long long ps = memparse(opt, &opt); - - if (arch_hugetlb_valid_size(ps)) { - hugetlb_add_hstate(ilog2(ps) - PAGE_SHIFT); - return 1; - } - - hugetlb_bad_size(); - pr_err("hugepagesz: Unsupported page size %lu M\n", ps >> 20); - return 0; - -} -__setup("hugepagesz=", setup_hugepagesz); - #ifdef CONFIG_CONTIG_ALLOC static __init int gigantic_pages_init(void) { diff --git a/arch/s390/mm/hugetlbpage.c b/arch/s390/mm/hugetlbpage.c index d92e8c5c3e71..b809762f206e 100644 --- a/arch/s390/mm/hugetlbpage.c +++ b/arch/s390/mm/hugetlbpage.c @@ -261,24 +261,6 @@ bool __init arch_hugetlb_valid_size(unsigned long long size) return false; } -static __init int setup_hugepagesz(char *opt) -{ - unsigned long long size; - char *string = opt; - - size = memparse(opt, &opt); - if (arch_hugetlb_valid_size(size)) { - hugetlb_add_hstate(ilog2(size) - PAGE_SHIFT); - } else { - hugetlb_bad_size(); - pr_err("hugepagesz= specifies an unsupported page size %s\n", - string); - return 0; - } - return 1; -} -__setup("hugepagesz=", setup_hugepagesz); - static unsigned long hugetlb_get_unmapped_area_bottomup(struct file *file, unsigned long addr, unsigned long len, unsigned long pgoff, unsigned long flags) diff --git a/arch/sparc/mm/init_64.c b/arch/sparc/mm/init_64.c index 4cc248817b19..5c29203fd460 100644 --- a/arch/sparc/mm/init_64.c +++ b/arch/sparc/mm/init_64.c @@ -398,28 +398,6 @@ bool __init arch_hugetlb_valid_size(unsigned long long size) return true; } - -static int __init setup_hugepagesz(char *string) -{ - unsigned long long hugepage_size; - int rc = 0; - - hugepage_size = memparse(string, &string); - - if (!arch_hugetlb_valid_size(hugepage_size)) { - hugetlb_bad_size(); - pr_err("hugepagesz=%llu not supported by MMU.\n", - hugepage_size); - goto out; - } - - add_huge_page_size(hugepage_size); - rc = 1; - -out: - return rc; -} -__setup("hugepagesz=", setup_hugepagesz); #endif /* CONFIG_HUGETLB_PAGE */ void update_mmu_cache(struct vm_area_struct *vma, unsigned long address, pte_t *ptep) diff --git a/arch/x86/mm/hugetlbpage.c b/arch/x86/mm/hugetlbpage.c index 51e6208fdeec..dd3ed09f6c23 100644 --- a/arch/x86/mm/hugetlbpage.c +++ b/arch/x86/mm/hugetlbpage.c @@ -191,22 +191,6 @@ bool __init arch_hugetlb_valid_size(unsigned long long size) return false; } -static __init int setup_hugepagesz(char *opt) -{ - unsigned long long ps = memparse(opt, &opt); - - if (arch_hugetlb_valid_size(ps)) { - hugetlb_add_hstate(ilog2(ps) - PAGE_SHIFT); - } else { - hugetlb_bad_size(); - printk(KERN_ERR "hugepagesz: Unsupported page size %llu M\n", - ps >> 20); - return 0; - } - return 1; -} -__setup("hugepagesz=", setup_hugepagesz); - #ifdef CONFIG_CONTIG_ALLOC static __init int gigantic_pages_init(void) { diff --git a/include/linux/hugetlb.h b/include/linux/hugetlb.h index 33343eb980d0..47244853ceb4 100644 --- a/include/linux/hugetlb.h +++ b/include/linux/hugetlb.h @@ -504,7 +504,6 @@ int huge_add_to_page_cache(struct page *page, struct address_space *mapping, int __init __alloc_bootmem_huge_page(struct hstate *h); int __init alloc_bootmem_huge_page(struct hstate *h); -void __init hugetlb_bad_size(void); void __init hugetlb_add_hstate(unsigned order); struct hstate *size_to_hstate(unsigned long size); diff --git a/mm/hugetlb.c b/mm/hugetlb.c index 2f99359b93af..cd4ec07080fb 100644 --- a/mm/hugetlb.c +++ b/mm/hugetlb.c @@ -3149,12 +3149,6 @@ static int __init hugetlb_init(void) } subsys_initcall(hugetlb_init); -/* Should be called on processing a hugepagesz=... option */ -void __init hugetlb_bad_size(void) -{ - parsed_valid_hugepagesz = false; -} - void __init hugetlb_add_hstate(unsigned int order) { struct hstate *h; @@ -3224,6 +3218,24 @@ static int __init hugetlb_nrpages_setup(char *s) } __setup("hugepages=", hugetlb_nrpages_setup); +static int __init hugepagesz_setup(char *s) +{ + unsigned long long size; + char *saved_s = s; + + size = memparse(s, &s); + + if (!arch_hugetlb_valid_size(size)) { + parsed_valid_hugepagesz = false; + pr_err("HugeTLB: unsupported hugepagesz %s\n", saved_s); + return 0; + } + + hugetlb_add_hstate(ilog2(size) - PAGE_SHIFT); + return 1; +} +__setup("hugepagesz=", hugepagesz_setup); + static int __init default_hugepagesz_setup(char *s) { unsigned long long size; From patchwork Wed Mar 18 22:06:33 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mike Kravetz X-Patchwork-Id: 11446153 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 4EC4092A for ; 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Wed, 18 Mar 2020 22:06:58 +0000 Received: from pps.filterd (aserp3020.oracle.com [127.0.0.1]) by aserp3020.oracle.com (8.16.0.42/8.16.0.42) with SMTP id 02ILvh6h055313; Wed, 18 Mar 2020 22:06:58 GMT Received: from aserv0122.oracle.com (aserv0122.oracle.com [141.146.126.236]) by aserp3020.oracle.com with ESMTP id 2ys92j02tg-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Wed, 18 Mar 2020 22:06:58 +0000 Received: from abhmp0008.oracle.com (abhmp0008.oracle.com [141.146.116.14]) by aserv0122.oracle.com (8.14.4/8.14.4) with ESMTP id 02IM6s3m006841; Wed, 18 Mar 2020 22:06:54 GMT Received: from monkey.oracle.com (/71.63.128.209) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Wed, 18 Mar 2020 15:06:54 -0700 From: Mike Kravetz To: linux-mm@kvack.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linuxppc-dev@lists.ozlabs.org, linux-riscv@lists.infradead.org, linux-s390@vger.kernel.org, sparclinux@vger.kernel.org, linux-doc@vger.kernel.org Cc: Catalin Marinas , Will Deacon , Benjamin Herrenschmidt , Paul Mackerras , Paul Walmsley , Palmer Dabbelt , Albert Ou , Heiko Carstens , Vasily Gorbik , Christian Borntraeger , "David S . Miller" , Thomas Gleixner , Ingo Molnar , Dave Hansen , Jonathan Corbet , Longpeng , Andrew Morton , Mike Kravetz Subject: [PATCH 3/4] hugetlbfs: remove hugetlb_add_hstate() warning for existing hstate Date: Wed, 18 Mar 2020 15:06:33 -0700 Message-Id: <20200318220634.32100-4-mike.kravetz@oracle.com> X-Mailer: git-send-email 2.24.1 In-Reply-To: <20200318220634.32100-1-mike.kravetz@oracle.com> References: <20200318220634.32100-1-mike.kravetz@oracle.com> MIME-Version: 1.0 X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9564 signatures=668685 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 malwarescore=0 mlxlogscore=999 mlxscore=0 spamscore=0 bulkscore=0 adultscore=0 suspectscore=0 phishscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2003020000 definitions=main-2003180094 X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9564 signatures=668685 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 lowpriorityscore=0 suspectscore=0 adultscore=0 bulkscore=0 mlxlogscore=999 priorityscore=1501 clxscore=1015 malwarescore=0 mlxscore=0 phishscore=0 impostorscore=0 spamscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2003020000 definitions=main-2003180094 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: The routine hugetlb_add_hstate prints a warning if the hstate already exists. This was originally done as part of kernel command line parsing. If 'hugepagesz=' was specified more than once, the warning pr_warn("hugepagesz= specified twice, ignoring\n"); would be printed. Some architectures want to enable all huge page sizes. They would call hugetlb_add_hstate for all supported sizes. However, this was done after command line processing and as a result hstates could have already been created for some sizes. To make sure no warning were printed, there would often be code like: if (!size_to_hstate(size) hugetlb_add_hstate(ilog2(size) - PAGE_SHIFT) The only time we want to print the warning is as the result of command line processing. So, remove the warning from hugetlb_add_hstate and add it to the single arch independent routine processing "hugepagesz=". After this, calls to size_to_hstate() in arch specific code can be removed and hugetlb_add_hstate can be called without worrying about warning messages. Signed-off-by: Mike Kravetz Acked-By: Mina Almasry --- arch/arm64/mm/hugetlbpage.c | 16 ++++------------ arch/powerpc/mm/hugetlbpage.c | 3 +-- arch/riscv/mm/hugetlbpage.c | 2 +- arch/sparc/mm/init_64.c | 19 ++++--------------- arch/x86/mm/hugetlbpage.c | 2 +- mm/hugetlb.c | 10 +++++++--- 6 files changed, 18 insertions(+), 34 deletions(-) diff --git a/arch/arm64/mm/hugetlbpage.c b/arch/arm64/mm/hugetlbpage.c index 4aa9534a45d7..050809e6f0a9 100644 --- a/arch/arm64/mm/hugetlbpage.c +++ b/arch/arm64/mm/hugetlbpage.c @@ -441,22 +441,14 @@ void huge_ptep_clear_flush(struct vm_area_struct *vma, clear_flush(vma->vm_mm, addr, ptep, pgsize, ncontig); } -static void __init add_huge_page_size(unsigned long size) -{ - if (size_to_hstate(size)) - return; - - hugetlb_add_hstate(ilog2(size) - PAGE_SHIFT); -} - static int __init hugetlbpage_init(void) { #ifdef CONFIG_ARM64_4K_PAGES - add_huge_page_size(PUD_SIZE); + hugetlb_add_hstate(ilog2(PUD_SIZE) - PAGE_SHIFT); #endif - add_huge_page_size(CONT_PMD_SIZE); - add_huge_page_size(PMD_SIZE); - add_huge_page_size(CONT_PTE_SIZE); + hugetlb_add_hstate(ilog2(CONT_PMD_SIZE) - PAGE_SHIFT); + hugetlb_add_hstate(ilog2(PMD_SIZE) - PAGE_SHIFT); + hugetlb_add_hstate(ilog2(CONT_PTE_SIZE) - PAGE_SHIFT); return 0; } diff --git a/arch/powerpc/mm/hugetlbpage.c b/arch/powerpc/mm/hugetlbpage.c index 166960ba1236..f46464ba6fb4 100644 --- a/arch/powerpc/mm/hugetlbpage.c +++ b/arch/powerpc/mm/hugetlbpage.c @@ -584,8 +584,7 @@ static int __init add_huge_page_size(unsigned long long size) if (!arch_hugetlb_valid_size(size)) return -EINVAL; - if (!size_to_hstate(size)) - hugetlb_add_hstate(shift - PAGE_SHIFT); + hugetlb_add_hstate(shift - PAGE_SHIFT); return 0; } diff --git a/arch/riscv/mm/hugetlbpage.c b/arch/riscv/mm/hugetlbpage.c index bdf89d7eb714..beaa91941db8 100644 --- a/arch/riscv/mm/hugetlbpage.c +++ b/arch/riscv/mm/hugetlbpage.c @@ -26,7 +26,7 @@ bool __init arch_hugetlb_valid_size(unsigned long long size) static __init int gigantic_pages_init(void) { /* With CONTIG_ALLOC, we can allocate gigantic pages at runtime */ - if (IS_ENABLED(CONFIG_64BIT) && !size_to_hstate(1UL << PUD_SHIFT)) + if (IS_ENABLED(CONFIG_64BIT)) hugetlb_add_hstate(PUD_SHIFT - PAGE_SHIFT); return 0; } diff --git a/arch/sparc/mm/init_64.c b/arch/sparc/mm/init_64.c index 5c29203fd460..8f619edc8f8c 100644 --- a/arch/sparc/mm/init_64.c +++ b/arch/sparc/mm/init_64.c @@ -325,23 +325,12 @@ static void __update_mmu_tsb_insert(struct mm_struct *mm, unsigned long tsb_inde } #ifdef CONFIG_HUGETLB_PAGE -static void __init add_huge_page_size(unsigned long size) -{ - unsigned int order; - - if (size_to_hstate(size)) - return; - - order = ilog2(size) - PAGE_SHIFT; - hugetlb_add_hstate(order); -} - static int __init hugetlbpage_init(void) { - add_huge_page_size(1UL << HPAGE_64K_SHIFT); - add_huge_page_size(1UL << HPAGE_SHIFT); - add_huge_page_size(1UL << HPAGE_256MB_SHIFT); - add_huge_page_size(1UL << HPAGE_2GB_SHIFT); + hugetlb_add_hstate(HPAGE_64K_SHIFT - PAGE_SHIFT); + hugetlb_add_hstate(HPAGE_SHIFT - PAGE_SHIFT); + hugetlb_add_hstate(HPAGE_256MB_SHIFT - PAGE_SHIFT); + hugetlb_add_hstate(HPAGE_2GB_SHIFT - PAGE_SHIFT); return 0; } diff --git a/arch/x86/mm/hugetlbpage.c b/arch/x86/mm/hugetlbpage.c index dd3ed09f6c23..8a3f586e1217 100644 --- a/arch/x86/mm/hugetlbpage.c +++ b/arch/x86/mm/hugetlbpage.c @@ -195,7 +195,7 @@ bool __init arch_hugetlb_valid_size(unsigned long long size) static __init int gigantic_pages_init(void) { /* With compaction or CMA we can allocate gigantic pages at runtime */ - if (boot_cpu_has(X86_FEATURE_GBPAGES) && !size_to_hstate(1UL << PUD_SHIFT)) + if (boot_cpu_has(X86_FEATURE_GBPAGES)) hugetlb_add_hstate(PUD_SHIFT - PAGE_SHIFT); return 0; } diff --git a/mm/hugetlb.c b/mm/hugetlb.c index cd4ec07080fb..cc85b4f156ca 100644 --- a/mm/hugetlb.c +++ b/mm/hugetlb.c @@ -3116,8 +3116,7 @@ static int __init hugetlb_init(void) } default_hstate_size = HPAGE_SIZE; - if (!size_to_hstate(default_hstate_size)) - hugetlb_add_hstate(HUGETLB_PAGE_ORDER); + hugetlb_add_hstate(HUGETLB_PAGE_ORDER); } default_hstate_idx = hstate_index(size_to_hstate(default_hstate_size)); if (default_hstate_max_huge_pages) { @@ -3155,7 +3154,6 @@ void __init hugetlb_add_hstate(unsigned int order) unsigned long i; if (size_to_hstate(PAGE_SIZE << order)) { - pr_warn("hugepagesz= specified twice, ignoring\n"); return; } BUG_ON(hugetlb_max_hstate >= HUGE_MAX_HSTATE); @@ -3231,6 +3229,12 @@ static int __init hugepagesz_setup(char *s) return 0; } + if (size_to_hstate(size)) { + pr_warn("HugeTLB: hugepagesz %s specified twice, ignoring\n", + saved_s); + return 0; + } + hugetlb_add_hstate(ilog2(size) - PAGE_SHIFT); return 1; } From patchwork Wed Mar 18 22:06:34 2020 Content-Type: text/plain; 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Wed, 18 Mar 2020 22:06:59 +0000 Received: from pps.filterd (aserp3030.oracle.com [127.0.0.1]) by aserp3030.oracle.com (8.16.0.42/8.16.0.42) with SMTP id 02ILv9Oq058865; Wed, 18 Mar 2020 22:06:58 GMT Received: from aserv0122.oracle.com (aserv0122.oracle.com [141.146.126.236]) by aserp3030.oracle.com with ESMTP id 2ys8tuteuj-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Wed, 18 Mar 2020 22:06:58 +0000 Received: from abhmp0008.oracle.com (abhmp0008.oracle.com [141.146.116.14]) by aserv0122.oracle.com (8.14.4/8.14.4) with ESMTP id 02IM6vVZ006849; Wed, 18 Mar 2020 22:06:57 GMT Received: from monkey.oracle.com (/71.63.128.209) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Wed, 18 Mar 2020 15:06:57 -0700 From: Mike Kravetz To: linux-mm@kvack.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linuxppc-dev@lists.ozlabs.org, linux-riscv@lists.infradead.org, linux-s390@vger.kernel.org, sparclinux@vger.kernel.org, linux-doc@vger.kernel.org Cc: Catalin Marinas , Will Deacon , Benjamin Herrenschmidt , Paul Mackerras , Paul Walmsley , Palmer Dabbelt , Albert Ou , Heiko Carstens , Vasily Gorbik , Christian Borntraeger , "David S . Miller" , Thomas Gleixner , Ingo Molnar , Dave Hansen , Jonathan Corbet , Longpeng , Andrew Morton , Mike Kravetz Subject: [PATCH 4/4] hugetlbfs: clean up command line processing Date: Wed, 18 Mar 2020 15:06:34 -0700 Message-Id: <20200318220634.32100-5-mike.kravetz@oracle.com> X-Mailer: git-send-email 2.24.1 In-Reply-To: <20200318220634.32100-1-mike.kravetz@oracle.com> References: <20200318220634.32100-1-mike.kravetz@oracle.com> MIME-Version: 1.0 X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9564 signatures=668685 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 adultscore=0 phishscore=0 mlxscore=0 malwarescore=0 suspectscore=0 mlxlogscore=999 spamscore=0 bulkscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2003020000 definitions=main-2003180094 X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9564 signatures=668685 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 malwarescore=0 bulkscore=0 suspectscore=0 lowpriorityscore=0 phishscore=0 adultscore=0 clxscore=1015 impostorscore=0 priorityscore=1501 spamscore=0 mlxlogscore=999 mlxscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2003020000 definitions=main-2003180094 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: With all hugetlb page processing done in a single file clean up code. - Make code match desired semantics - Update documentation with semantics - Make all warnings and errors messages start with 'HugeTLB:'. - Consistently name command line parsing routines. - Add comments to code - Describe some of the subtle interactions - Describe semantics of command line arguments Signed-off-by: Mike Kravetz --- Documentation/admin-guide/mm/hugetlbpage.rst | 26 +++++++ mm/hugetlb.c | 78 +++++++++++++++----- 2 files changed, 87 insertions(+), 17 deletions(-) diff --git a/Documentation/admin-guide/mm/hugetlbpage.rst b/Documentation/admin-guide/mm/hugetlbpage.rst index 1cc0bc78d10e..afc8888f33c3 100644 --- a/Documentation/admin-guide/mm/hugetlbpage.rst +++ b/Documentation/admin-guide/mm/hugetlbpage.rst @@ -100,6 +100,32 @@ with a huge page size selection parameter "hugepagesz=". must be specified in bytes with optional scale suffix [kKmMgG]. The default huge page size may be selected with the "default_hugepagesz=" boot parameter. +Hugetlb boot command line parameter semantics +hugepagesz - Specify a huge page size. Used in conjunction with hugepages + parameter to preallocate a number of huge pages of the specified + size. Hence, hugepagesz and hugepages are typically specified in + pairs such as: + hugepagesz=2M hugepages=512 + hugepagesz can only be specified once on the command line for a + specific huge page size. Valid huge page sizes are architecture + dependent. +hugepages - Specify the number of huge pages to preallocate. This typically + follows a valid hugepagesz parameter. However, if hugepages is the + first or only hugetlb command line parameter it specifies the number + of huge pages of default size to allocate. The number of huge pages + of default size specified in this manner can be overwritten by a + hugepagesz,hugepages parameter pair for the default size. + For example, on an architecture with 2M default huge page size: + hugepages=256 hugepagesz=2M hugepages=512 + will result in 512 2M huge pages being allocated. If a hugepages + parameter is preceded by an invalid hugepagesz parameter, it will + be ignored. +default_hugepagesz - Specify the default huge page size. This parameter can + only be specified on the command line. No other hugetlb command line + parameter is associated with default_hugepagesz. Therefore, it can + appear anywhere on the command line. Valid default huge page size is + architecture dependent. + When multiple huge page sizes are supported, ``/proc/sys/vm/nr_hugepages`` indicates the current number of pre-allocated huge pages of the default size. Thus, one can use the following command to dynamically allocate/deallocate diff --git a/mm/hugetlb.c b/mm/hugetlb.c index cc85b4f156ca..2b9bf01db2b6 100644 --- a/mm/hugetlb.c +++ b/mm/hugetlb.c @@ -2954,7 +2954,7 @@ static void __init hugetlb_sysfs_init(void) err = hugetlb_sysfs_add_hstate(h, hugepages_kobj, hstate_kobjs, &hstate_attr_group); if (err) - pr_err("Hugetlb: Unable to add hstate %s", h->name); + pr_err("HugeTLB: Unable to add hstate %s", h->name); } } @@ -3058,7 +3058,7 @@ static void hugetlb_register_node(struct node *node) nhs->hstate_kobjs, &per_node_hstate_attr_group); if (err) { - pr_err("Hugetlb: Unable to add hstate %s for node %d\n", + pr_err("HugeTLB: Unable to add hstate %s for node %d\n", h->name, node->dev.id); hugetlb_unregister_node(node); break; @@ -3109,19 +3109,35 @@ static int __init hugetlb_init(void) if (!hugepages_supported()) return 0; - if (!size_to_hstate(default_hstate_size)) { - if (default_hstate_size != 0) { - pr_err("HugeTLB: unsupported default_hugepagesz %lu. Reverting to %lu\n", - default_hstate_size, HPAGE_SIZE); - } - + /* + * Make sure HPAGE_SIZE (HUGETLB_PAGE_ORDER) hstate exists. Some + * architectures depend on setup being done here. + * + * If a valid default huge page size was specified on the command line, + * add associated hstate if necessary. If not, set default_hstate_size + * to default size. default_hstate_idx is used at runtime to identify + * the default huge page size/hstate. + */ + hugetlb_add_hstate(HUGETLB_PAGE_ORDER); + if (default_hstate_size) + hugetlb_add_hstate(ilog2(default_hstate_size) - PAGE_SHIFT); + else default_hstate_size = HPAGE_SIZE; - hugetlb_add_hstate(HUGETLB_PAGE_ORDER); - } default_hstate_idx = hstate_index(size_to_hstate(default_hstate_size)); + + /* + * default_hstate_max_huge_pages != 0 indicates a count (hugepages=) + * specified before a size (hugepagesz=). Use this count for the + * default huge page size, unless a specific value was specified for + * this size in a hugepagesz/hugepages pair. + */ if (default_hstate_max_huge_pages) { if (!default_hstate.max_huge_pages) - default_hstate.max_huge_pages = default_hstate_max_huge_pages; + default_hstate.max_huge_pages = + default_hstate_max_huge_pages; + else + pr_warn("HugeTLB: First hugepages=%lu kB ignored\n", + default_hstate_max_huge_pages); } hugetlb_init_hstates(); @@ -3174,20 +3190,27 @@ void __init hugetlb_add_hstate(unsigned int order) parsed_hstate = h; } -static int __init hugetlb_nrpages_setup(char *s) +/* + * hugepages command line processing + * hugepages must normally follows a valid hugepagsz specification. If not, + * ignore the hugepages value. hugepages can also be the first huge page + * command line option in which case it specifies the number of huge pages + * for the default size. + */ +static int __init hugepages_setup(char *s) { unsigned long *mhp; static unsigned long *last_mhp; if (!parsed_valid_hugepagesz) { - pr_warn("hugepages = %s preceded by " + pr_warn("HugeTLB: hugepages = %s preceded by " "an unsupported hugepagesz, ignoring\n", s); parsed_valid_hugepagesz = true; return 1; } /* - * !hugetlb_max_hstate means we haven't parsed a hugepagesz= parameter yet, - * so this hugepages= parameter goes to the "default hstate". + * !hugetlb_max_hstate means we haven't parsed a hugepagesz= parameter + * yet, so this hugepages= parameter goes to the "default hstate". */ else if (!hugetlb_max_hstate) mhp = &default_hstate_max_huge_pages; @@ -3195,7 +3218,8 @@ static int __init hugetlb_nrpages_setup(char *s) mhp = &parsed_hstate->max_huge_pages; if (mhp == last_mhp) { - pr_warn("hugepages= specified twice without interleaving hugepagesz=, ignoring\n"); + pr_warn("HugeTLB: hugepages= specified twice without interleaving hugepagesz=, ignoring hugepages=%s\n", + s); return 1; } @@ -3214,8 +3238,15 @@ static int __init hugetlb_nrpages_setup(char *s) return 1; } -__setup("hugepages=", hugetlb_nrpages_setup); +__setup("hugepages=", hugepages_setup); +/* + * hugepagesz command line processing + * A specific huge page size can only be specified once with hugepagesz. + * hugepagesz is followed by hugepages on the commnad line. The global + * variable 'parsed_valid_hugepagesz' is used to determine if prior + * hugepagesz argument was valid. + */ static int __init hugepagesz_setup(char *s) { unsigned long long size; @@ -3230,16 +3261,23 @@ static int __init hugepagesz_setup(char *s) } if (size_to_hstate(size)) { + parsed_valid_hugepagesz = false; pr_warn("HugeTLB: hugepagesz %s specified twice, ignoring\n", saved_s); return 0; } + parsed_valid_hugepagesz = true; hugetlb_add_hstate(ilog2(size) - PAGE_SHIFT); return 1; } __setup("hugepagesz=", hugepagesz_setup); +/* + * default_hugepagesz command line input + * Only one instance of default_hugepagesz allowed on command line. Do not + * add hstate here as that will confuse hugepagesz/hugepages processing. + */ static int __init default_hugepagesz_setup(char *s) { unsigned long long size; @@ -3252,6 +3290,12 @@ static int __init default_hugepagesz_setup(char *s) return 0; } + if (default_hstate_size) { + pr_err("HugeTLB: default_hugepagesz previously specified, ignoring %s\n", + saved_s); + return 0; + } + default_hstate_size = size; return 1; }