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AJvYcCUOkeyaLO5ZsB+mxO2HaUfYsyhAY2NWxRQ3tmZtkZms2q6PZQI8btS6wD3JvO01aUHGyitY/+orO5TR@vger.kernel.org X-Gm-Message-State: AOJu0Yy/ag5fyoh7QuTZ/Julbq13C2dzapJLZXr2iAFaZcnDIUAwZBiG 3/uwyXcCMXLNzaLDLCm+T2r21cTzmBKTaLoWLL+ThhTXMhCxRc8xS/4JnzBNpJ+d4oMzqjtVK6l jCPpxrvV0m5zTJBB/Idtrhw== X-Google-Smtp-Source: AGHT+IHidwQ3DrDPNLywyhRXMiEnGjaKCiBaEc5hXwYPZZjpJE9GCWopm3osDWhhLjTFzQGtE2yr4rptNlkPUN/bOw== X-Received: from pfbch7.prod.google.com ([2002:a05:6a00:2887:b0:725:e05b:5150]) (user=kaleshsingh job=prod-delivery.src-stubby-dispatcher) by 2002:a05:6a00:99f:b0:725:e015:909d with SMTP id d2e1a72fcca58-728faadfd6cmr1845767b3a.21.1733959697352; Wed, 11 Dec 2024 15:28:17 -0800 (PST) Date: Wed, 11 Dec 2024 15:27:48 -0800 In-Reply-To: <20241211232754.1583023-1-kaleshsingh@google.com> Precedence: bulk X-Mailing-List: linux-mips@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20241211232754.1583023-1-kaleshsingh@google.com> X-Mailer: git-send-email 2.47.0.338.g60cca15819-goog Message-ID: <20241211232754.1583023-11-kaleshsingh@google.com> Subject: [PATCH mm-unstable v2 10/16] mm: s390: Use generic_mmap_hint() From: Kalesh Singh To: akpm@linux-foundation.org, vbabka@suse.cz, yang@os.amperecomputing.com, riel@surriel.com, david@redhat.com, minchan@kernel.org, jyescas@google.com Cc: linux@armlinux.org.uk, tsbogend@alpha.franken.de, James.Bottomley@HansenPartnership.com, ysato@users.sourceforge.jp, dalias@libc.org, glaubitz@physik.fu-berlin.de, davem@davemloft.net, andreas@gaisler.com, tglx@linutronix.de, bp@alien8.de, dave.hansen@linux.intel.com, x86@kernel.org, chris@zankel.net, jcmvbkbc@gmail.com, bhelgaas@google.com, jason.andryuk@amd.com, leitao@debian.org, linux-alpha@vger.kernel.org, linux-kernel@vger.kernel.org, linux-snps-arc@lists.infradead.org, linux-arm-kernel@lists.infradead.org, linux-csky@vger.kernel.org, loongarch@lists.linux.dev, linux-mips@vger.kernel.org, linux-parisc@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-s390@vger.kernel.org, linux-sh@vger.kernel.org, sparclinux@vger.kernel.org, linux-mm@kvack.org, kernel-team@android.com, android-mm@google.com, Kalesh Singh Introduce s390 arch_mmap_hint() and define HAVE_ARCH_MMAP_HINT. This is a preparatory patch, no functional change is introduced. Signed-off-by: Kalesh Singh --- Changes in v2: - MAP_FIXED case is also handled in arch_mmap_hint() since this is just a special case of the hint addr being "enforced", per Yang Shi. - Consolidate error handling in arch_mmap_hint(). arch/s390/include/asm/pgtable.h | 1 + arch/s390/mm/mmap.c | 51 +++++++++++++++------------------ 2 files changed, 24 insertions(+), 28 deletions(-) diff --git a/arch/s390/include/asm/pgtable.h b/arch/s390/include/asm/pgtable.h index 48268095b0a3..eaecb558ab9b 100644 --- a/arch/s390/include/asm/pgtable.h +++ b/arch/s390/include/asm/pgtable.h @@ -1997,6 +1997,7 @@ extern void s390_reset_cmma(struct mm_struct *mm); /* s390 has a private copy of get unmapped area to deal with cache synonyms */ #define HAVE_ARCH_UNMAPPED_AREA #define HAVE_ARCH_UNMAPPED_AREA_TOPDOWN +#define HAVE_ARCH_MMAP_HINT #define pmd_pgtable(pmd) \ ((pgtable_t)__va(pmd_val(pmd) & -sizeof(pte_t)*PTRS_PER_PTE)) diff --git a/arch/s390/mm/mmap.c b/arch/s390/mm/mmap.c index 33f3504be90b..8afb046605c9 100644 --- a/arch/s390/mm/mmap.c +++ b/arch/s390/mm/mmap.c @@ -83,28 +83,33 @@ static int get_align_mask(struct file *filp, unsigned long flags) return 0; } +unsigned long arch_mmap_hint(struct file *filp, unsigned long addr, + unsigned long len, unsigned long pgoff, + unsigned long flags) +{ + /* requested length too big for entire address space */ + if (len > TASK_SIZE - mmap_min_addr) + return -ENOMEM; + + if (flags & MAP_FIXED) + return addr; + + return generic_mmap_hint(filp, addr, len, pgoff, flags); +} + unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr, unsigned long len, unsigned long pgoff, unsigned long flags, vm_flags_t vm_flags) { struct mm_struct *mm = current->mm; - struct vm_area_struct *vma; struct vm_unmapped_area_info info = {}; - if (len > TASK_SIZE - mmap_min_addr) - return -ENOMEM; - - if (flags & MAP_FIXED) + addr = arch_mmap_hint(filp, addr, len, pgoff, flags); + if (IS_ERR_VALUE(addr)) + return addr; + if (addr) goto check_asce_limit; - if (addr) { - addr = PAGE_ALIGN(addr); - vma = find_vma(mm, addr); - if (TASK_SIZE - len >= addr && addr >= mmap_min_addr && - (!vma || addr + len <= vm_start_gap(vma))) - goto check_asce_limit; - } - info.length = len; info.low_limit = mm->mmap_base; info.high_limit = TASK_SIZE; @@ -123,25 +128,15 @@ unsigned long arch_get_unmapped_area_topdown(struct file *filp, unsigned long ad unsigned long len, unsigned long pgoff, unsigned long flags, vm_flags_t vm_flags) { - struct vm_area_struct *vma; struct mm_struct *mm = current->mm; struct vm_unmapped_area_info info = {}; - /* requested length too big for entire address space */ - if (len > TASK_SIZE - mmap_min_addr) - return -ENOMEM; - - if (flags & MAP_FIXED) - goto check_asce_limit; - /* requesting a specific address */ - if (addr) { - addr = PAGE_ALIGN(addr); - vma = find_vma(mm, addr); - if (TASK_SIZE - len >= addr && addr >= mmap_min_addr && - (!vma || addr + len <= vm_start_gap(vma))) - goto check_asce_limit; - } + addr = arch_mmap_hint(filp, addr, len, pgoff, flags); + if (IS_ERR_VALUE(addr)) + return addr; + if (addr) + goto check_asce_limit; info.flags = VM_UNMAPPED_AREA_TOPDOWN; info.length = len;