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Violators will be prosecuted for from ; Mon, 9 Oct 2017 11:08:43 +0100 From: Laurent Dufour Subject: [PATCH v4 12/20] mm: Introduce __vm_normal_page() Date: Mon, 9 Oct 2017 12:07:44 +0200 In-Reply-To: <1507543672-25821-1-git-send-email-ldufour@linux.vnet.ibm.com> References: <1507543672-25821-1-git-send-email-ldufour@linux.vnet.ibm.com> Message-Id: <1507543672-25821-13-git-send-email-ldufour@linux.vnet.ibm.com> Sender: owner-linux-mm@kvack.org List-ID: To: paulmck@linux.vnet.ibm.com, peterz@infradead.org, akpm@linux-foundation.org, kirill@shutemov.name, ak@linux.intel.com, mhocko@kernel.org, dave@stgolabs.net, jack@suse.cz, Matthew Wilcox , benh@kernel.crashing.org, mpe@ellerman.id.au, paulus@samba.org, Thomas Gleixner , Ingo Molnar , hpa@zytor.com, Will Deacon , Sergey Senozhatsky , Andrea Arcangeli , Alexei Starovoitov Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org, haren@linux.vnet.ibm.com, khandual@linux.vnet.ibm.com, npiggin@gmail.com, bsingharora@gmail.com, Tim Chen , linuxppc-dev@lists.ozlabs.org, x86@kernel.org When dealing with the speculative fault path we should use the VMA's field cached value stored in the vm_fault structure. Currently vm_normal_page() is using the pointer to the VMA to fetch the vm_flags value. This patch provides a new __vm_normal_page() which is receiving the vm_flags flags value as parameter. Note: The speculative path is turned on for architecture providing support for special PTE flag. So only the first block of vm_normal_page is used during the speculative path. Signed-off-by: Laurent Dufour --- include/linux/mm.h | 7 +++++-- mm/memory.c | 18 ++++++++++-------- 2 files changed, 15 insertions(+), 10 deletions(-) diff --git a/include/linux/mm.h b/include/linux/mm.h index cdccee815227..fe464c01d651 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -1246,8 +1246,11 @@ struct zap_details { pgoff_t last_index; /* Highest page->index to unmap */ }; -struct page *_vm_normal_page(struct vm_area_struct *vma, unsigned long addr, - pte_t pte, bool with_public_device); +struct page *__vm_normal_page(struct vm_area_struct *vma, unsigned long addr, + pte_t pte, bool with_public_device, + unsigned long vma_flags); +#define _vm_normal_page(vma, addr, pte, with_public_device) \ + __vm_normal_page(vma, addr, pte, with_public_device, (vma)->vm_flags) #define vm_normal_page(vma, addr, pte) _vm_normal_page(vma, addr, pte, false) struct page *vm_normal_page_pmd(struct vm_area_struct *vma, unsigned long addr, diff --git a/mm/memory.c b/mm/memory.c index d91418708845..3ea1bbe6cb03 100644 --- a/mm/memory.c +++ b/mm/memory.c @@ -823,8 +823,9 @@ static void print_bad_pte(struct vm_area_struct *vma, unsigned long addr, #else # define HAVE_PTE_SPECIAL 0 #endif -struct page *_vm_normal_page(struct vm_area_struct *vma, unsigned long addr, - pte_t pte, bool with_public_device) +struct page *__vm_normal_page(struct vm_area_struct *vma, unsigned long addr, + pte_t pte, bool with_public_device, + unsigned long vma_flags) { unsigned long pfn = pte_pfn(pte); @@ -833,7 +834,7 @@ struct page *_vm_normal_page(struct vm_area_struct *vma, unsigned long addr, goto check_pfn; if (vma->vm_ops && vma->vm_ops->find_special_page) return vma->vm_ops->find_special_page(vma, addr); - if (vma->vm_flags & (VM_PFNMAP | VM_MIXEDMAP)) + if (vma_flags & (VM_PFNMAP | VM_MIXEDMAP)) return NULL; if (pte_devmap(pte)) return NULL; @@ -867,8 +868,8 @@ struct page *_vm_normal_page(struct vm_area_struct *vma, unsigned long addr, /* !HAVE_PTE_SPECIAL case follows: */ - if (unlikely(vma->vm_flags & (VM_PFNMAP|VM_MIXEDMAP))) { - if (vma->vm_flags & VM_MIXEDMAP) { + if (unlikely(vma_flags & (VM_PFNMAP|VM_MIXEDMAP))) { + if (vma_flags & VM_MIXEDMAP) { if (!pfn_valid(pfn)) return NULL; goto out; @@ -877,7 +878,7 @@ struct page *_vm_normal_page(struct vm_area_struct *vma, unsigned long addr, off = (addr - vma->vm_start) >> PAGE_SHIFT; if (pfn == vma->vm_pgoff + off) return NULL; - if (!is_cow_mapping(vma->vm_flags)) + if (!is_cow_mapping(vma_flags)) return NULL; } } @@ -2730,7 +2731,8 @@ static int do_wp_page(struct vm_fault *vmf) { struct vm_area_struct *vma = vmf->vma; - vmf->page = vm_normal_page(vma, vmf->address, vmf->orig_pte); + vmf->page = __vm_normal_page(vma, vmf->address, vmf->orig_pte, false, + vmf->vma_flags); if (!vmf->page) { /* * VM_MIXEDMAP !pfn_valid() case, or VM_SOFTDIRTY clear on a @@ -3820,7 +3822,7 @@ static int do_numa_page(struct vm_fault *vmf) ptep_modify_prot_commit(vma->vm_mm, vmf->address, vmf->pte, pte); update_mmu_cache(vma, vmf->address, vmf->pte); - page = vm_normal_page(vma, vmf->address, pte); + page = __vm_normal_page(vma, vmf->address, pte, false, vmf->vma_flags); if (!page) { pte_unmap_unlock(vmf->pte, vmf->ptl); return 0; -- 2.7.4 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org