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AJvYcCWfUPx7V8XqbnyLyYruWwjr85cnTQ8K26EbVXRDA/P7b11b9rGYOuw7/eVDPm7LjphFQkMFlgUbyKjO@vger.kernel.org X-Gm-Message-State: AOJu0Yx0Lo5vJ+jvmdjJtp7MCSWmn5EyYwt7c5j/5p/PsdGegGDQbr9U gkSaZmN7y4Tl0wjFmf/xV8kcXndN4Asov5adVoHBPVY/A+bihmSluLVwGQNj3o9MiKPZ3dEbhUj RA97DgrEimK2pUCxhoZyVtQ== X-Google-Smtp-Source: AGHT+IH7t7zoi6yI0PaPMLOJjSIpLoHx+Um10nYrD7SAuARxjRKOSw8DIf3dxsqs6hFZHoDsSpm8PlX4hDRCbsA6SQ== X-Received: from pgbcr9.prod.google.com ([2002:a05:6a02:4109:b0:7fd:4e21:2f5a]) (user=kaleshsingh job=prod-delivery.src-stubby-dispatcher) by 2002:a17:902:d590:b0:216:7ee9:2227 with SMTP id d9443c01a7336-21778505a3cmr82109795ad.36.1733959699175; Wed, 11 Dec 2024 15:28:19 -0800 (PST) Date: Wed, 11 Dec 2024 15:27:49 -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: <20241211232754.1583023-12-kaleshsingh@google.com> Subject: [PATCH mm-unstable v2 11/16] mm: sh: Introduce arch_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 sh 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/sh/include/asm/pgtable.h | 1 + arch/sh/mm/mmap.c | 83 ++++++++++++++--------------------- 2 files changed, 33 insertions(+), 51 deletions(-) diff --git a/arch/sh/include/asm/pgtable.h b/arch/sh/include/asm/pgtable.h index 729f5c6225fb..072dbe038808 100644 --- a/arch/sh/include/asm/pgtable.h +++ b/arch/sh/include/asm/pgtable.h @@ -149,5 +149,6 @@ static inline bool pte_access_permitted(pte_t pte, bool write) /* arch/sh/mm/mmap.c */ #define HAVE_ARCH_UNMAPPED_AREA #define HAVE_ARCH_UNMAPPED_AREA_TOPDOWN +#define HAVE_ARCH_MMAP_HINT #endif /* __ASM_SH_PGTABLE_H */ diff --git a/arch/sh/mm/mmap.c b/arch/sh/mm/mmap.c index c442734d9b0c..ebda962e8c4e 100644 --- a/arch/sh/mm/mmap.c +++ b/arch/sh/mm/mmap.c @@ -51,14 +51,14 @@ static inline unsigned long COLOUR_ALIGN(unsigned long addr, return base + off; } -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) +unsigned long arch_mmap_hint(struct file *filp, unsigned long addr, + unsigned long len, unsigned long pgoff, + unsigned long flags) { - struct mm_struct *mm = current->mm; - struct vm_area_struct *vma; - int do_colour_align; - struct vm_unmapped_area_info info = {}; + bool do_colour_align; + + if (unlikely(len > TASK_SIZE)) + return -ENOMEM; if (flags & MAP_FIXED) { /* We do not accept a shared mapping if it would violate @@ -70,24 +70,29 @@ unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr, return addr; } - if (unlikely(len > TASK_SIZE)) - return -ENOMEM; + do_colour_align = filp || (flags & MAP_SHARED); - do_colour_align = 0; - if (filp || (flags & MAP_SHARED)) - do_colour_align = 1; + if (do_colour_align) + addr = COLOUR_ALIGN(addr, pgoff); + else + addr = PAGE_ALIGN(addr); - if (addr) { - if (do_colour_align) - addr = COLOUR_ALIGN(addr, pgoff); - else - addr = PAGE_ALIGN(addr); + return generic_mmap_hint(filp, addr, len, pgoff, flags); +} - vma = find_vma(mm, addr); - if (TASK_SIZE - len >= addr && - (!vma || addr + len <= vm_start_gap(vma))) - return addr; - } + +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 vm_unmapped_area_info info = {}; + bool do_colour_align; + + addr = arch_mmap_hint(filp, addr, len, pgoff, flags); + if (addr) + return addr; + + do_colour_align = filp || (flags & MAP_SHARED); info.length = len; info.low_limit = TASK_UNMAPPED_BASE; @@ -102,41 +107,17 @@ arch_get_unmapped_area_topdown(struct file *filp, const unsigned long addr0, const unsigned long len, const unsigned long pgoff, const unsigned long flags, vm_flags_t vm_flags) { - struct vm_area_struct *vma; struct mm_struct *mm = current->mm; unsigned long addr = addr0; - int do_colour_align; struct vm_unmapped_area_info info = {}; + bool do_colour_align; - if (flags & MAP_FIXED) { - /* We do not accept a shared mapping if it would violate - * cache aliasing constraints. - */ - if ((flags & MAP_SHARED) && - ((addr - (pgoff << PAGE_SHIFT)) & shm_align_mask)) - return -EINVAL; + /* requesting a specific address */ + addr = arch_mmap_hint(filp, addr, len, pgoff, flags); + if (addr) return addr; - } - if (unlikely(len > TASK_SIZE)) - return -ENOMEM; - - do_colour_align = 0; - if (filp || (flags & MAP_SHARED)) - do_colour_align = 1; - - /* requesting a specific address */ - if (addr) { - if (do_colour_align) - addr = COLOUR_ALIGN(addr, pgoff); - else - addr = PAGE_ALIGN(addr); - - vma = find_vma(mm, addr); - if (TASK_SIZE - len >= addr && - (!vma || addr + len <= vm_start_gap(vma))) - return addr; - } + do_colour_align = filp || (flags & MAP_SHARED); info.flags = VM_UNMAPPED_AREA_TOPDOWN; info.length = len;