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AJvYcCXgXlUYifcjV3kegETGVdFp/u4IhfZvIkYqlNSYqHfbbDMGeLo5xRu/SkUqrB4MGzxUC/I1NV5kVl7f7Dg=@vger.kernel.org X-Gm-Message-State: AOJu0Yx9j1R0Igx8B4fNdqZSSvOB2dUBa2o8zTAQQdWxCGs9jD97hNXu GVIvDC4kw7EY0RyPPpN2lOTW5z+Pb3WNYWqmdq/t9rRj5o3rt7qNEEvcRyIYMk24fvtn0os8696 Z9NP1O7yK3x4ypfcCsOVtYA== X-Google-Smtp-Source: AGHT+IHgv+hz6lUV53h1smjsDXGUMrAdu+yMyNI0Y1qN6skLJAQw6jBsC8TmY8m6/oNaMxzzcfOLndyqCxWrzR4uSQ== X-Received: from pgbee13.prod.google.com ([2002:a05:6a02:458d:b0:7fd:4d08:df94]) (user=kaleshsingh job=prod-delivery.src-stubby-dispatcher) by 2002:a05:6a21:7890:b0:1db:e40d:5f89 with SMTP id adf61e73a8af0-1e1cebb5277mr1761320637.28.1733959689528; Wed, 11 Dec 2024 15:28:09 -0800 (PST) Date: Wed, 11 Dec 2024 15:27:44 -0800 In-Reply-To: <20241211232754.1583023-1-kaleshsingh@google.com> Precedence: bulk X-Mailing-List: linux-parisc@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: <20241211232754.1583023-7-kaleshsingh@google.com> Subject: [PATCH mm-unstable v2 06/16] mm: csky: 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 csky 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/csky/abiv1/inc/abi/pgtable-bits.h | 1 + arch/csky/abiv1/mmap.c | 68 ++++++++++++++------------ 2 files changed, 38 insertions(+), 31 deletions(-) diff --git a/arch/csky/abiv1/inc/abi/pgtable-bits.h b/arch/csky/abiv1/inc/abi/pgtable-bits.h index ae7a2f76dd42..c346a9fcb522 100644 --- a/arch/csky/abiv1/inc/abi/pgtable-bits.h +++ b/arch/csky/abiv1/inc/abi/pgtable-bits.h @@ -51,5 +51,6 @@ ((offset) << 10)}) #define HAVE_ARCH_UNMAPPED_AREA +#define HAVE_ARCH_MMAP_HINT #endif /* __ASM_CSKY_PGTABLE_BITS_H */ diff --git a/arch/csky/abiv1/mmap.c b/arch/csky/abiv1/mmap.c index 1047865e82a9..0c5c51a081e4 100644 --- a/arch/csky/abiv1/mmap.c +++ b/arch/csky/abiv1/mmap.c @@ -13,6 +13,39 @@ ((((addr)+SHMLBA-1)&~(SHMLBA-1)) + \ (((pgoff)< TASK_SIZE) + return -ENOMEM; + + /* + * We only need to do colour alignment if either the I or D + * caches alias. + */ + do_align = filp || (flags & MAP_SHARED); + + /* + * We enforce the MAP_FIXED case. + */ + if (flags & MAP_FIXED) { + if (flags & MAP_SHARED && + (addr - (pgoff << PAGE_SHIFT)) & (SHMLBA - 1)) + return -EINVAL; + return addr; + } + + if (do_align) + addr = COLOUR_ALIGN(addr, pgoff); + else + addr = PAGE_ALIGN(addr); + + return generic_mmap_hint(filp, addr, len, pgoff, flags); +} + /* * We need to ensure that shared mappings are correctly aligned to * avoid aliasing issues with VIPT caches. We need to ensure that @@ -27,8 +60,7 @@ arch_get_unmapped_area(struct file *filp, unsigned long addr, unsigned long flags, vm_flags_t vm_flags) { struct mm_struct *mm = current->mm; - struct vm_area_struct *vma; - int do_align = 0; + bool do_align; struct vm_unmapped_area_info info = { .length = len, .low_limit = mm->mmap_base, @@ -36,37 +68,11 @@ arch_get_unmapped_area(struct file *filp, unsigned long addr, .align_offset = pgoff << PAGE_SHIFT }; - /* - * We only need to do colour alignment if either the I or D - * caches alias. - */ - do_align = filp || (flags & MAP_SHARED); - - /* - * We enforce the MAP_FIXED case. - */ - if (flags & MAP_FIXED) { - if (flags & MAP_SHARED && - (addr - (pgoff << PAGE_SHIFT)) & (SHMLBA - 1)) - return -EINVAL; + addr = arch_mmap_hint(filp, addr, len, pgoff, flags); + if (addr) return addr; - } - - if (len > TASK_SIZE) - return -ENOMEM; - - if (addr) { - if (do_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_align = filp || (flags & MAP_SHARED); info.align_mask = do_align ? (PAGE_MASK & (SHMLBA - 1)) : 0; return vm_unmapped_area(&info); }