From: Anshuman Khandual <anshuman.khandual@arm.com> To: linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org Cc: Anshuman Khandual <anshuman.khandual@arm.com>, Catalin Marinas <catalin.marinas@arm.com>, Will Deacon <will.deacon@arm.com>, Mark Rutland <mark.rutland@arm.com>, James Morse <james.morse@arm.com>, Andrey Konovalov <andreyknvl@google.com>, Christoph Hellwig <hch@infradead.org> Subject: [PATCH V3 2/2] arm64/mm: Refactor __do_page_fault() Date: Fri, 7 Jun 2019 14:43:06 +0530 [thread overview] Message-ID: <1559898786-28530-3-git-send-email-anshuman.khandual@arm.com> (raw) In-Reply-To: <1559898786-28530-1-git-send-email-anshuman.khandual@arm.com> __do_page_fault() is over complicated with multiple goto statements. This cleans up the code flow and while there drops local variable vm_fault_t. Signed-off-by: Anshuman Khandual <anshuman.khandual@arm.com> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Will Deacon <will.deacon@arm.com> Cc: Mark Rutland <mark.rutland@arm.com> Cc: James Morse <james.morse@arm.com> Cc: Andrey Konovalov <andreyknvl@google.com> Cc: Christoph Hellwig <hch@infradead.org> --- arch/arm64/mm/fault.c | 30 +++++++++++------------------- 1 file changed, 11 insertions(+), 19 deletions(-) diff --git a/arch/arm64/mm/fault.c b/arch/arm64/mm/fault.c index 95cac4a..235b7c0 100644 --- a/arch/arm64/mm/fault.c +++ b/arch/arm64/mm/fault.c @@ -397,37 +397,29 @@ static void do_bad_area(unsigned long addr, unsigned int esr, struct pt_regs *re static vm_fault_t __do_page_fault(struct mm_struct *mm, unsigned long addr, unsigned int mm_flags, unsigned long vm_flags) { - struct vm_area_struct *vma; - vm_fault_t fault; + struct vm_area_struct *vma = find_vma(mm, addr); - vma = find_vma(mm, addr); - fault = VM_FAULT_BADMAP; if (unlikely(!vma)) - goto out; - if (unlikely(vma->vm_start > addr)) - goto check_stack; + return VM_FAULT_BADMAP; /* * Ok, we have a good vm_area for this memory access, so we can handle * it. */ -good_area: + if (unlikely(vma->vm_start > addr)) { + if (!(vma->vm_flags & VM_GROWSDOWN)) + return VM_FAULT_BADMAP; + if (expand_stack(vma, addr)) + return VM_FAULT_BADMAP; + } + /* * Check that the permissions on the VMA allow for the fault which * occurred. */ - if (!(vma->vm_flags & vm_flags)) { - fault = VM_FAULT_BADACCESS; - goto out; - } - + if (!(vma->vm_flags & vm_flags)) + return VM_FAULT_BADACCESS; return handle_mm_fault(vma, addr & PAGE_MASK, mm_flags); - -check_stack: - if (vma->vm_flags & VM_GROWSDOWN && !expand_stack(vma, addr)) - goto good_area; -out: - return fault; } static bool is_el0_instruction_abort(unsigned int esr) -- 2.7.4
WARNING: multiple messages have this Message-ID (diff)
From: Anshuman Khandual <anshuman.khandual@arm.com> To: linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org Cc: Mark Rutland <mark.rutland@arm.com>, Anshuman Khandual <anshuman.khandual@arm.com>, Catalin Marinas <catalin.marinas@arm.com>, Will Deacon <will.deacon@arm.com>, Christoph Hellwig <hch@infradead.org>, James Morse <james.morse@arm.com>, Andrey Konovalov <andreyknvl@google.com> Subject: [PATCH V3 2/2] arm64/mm: Refactor __do_page_fault() Date: Fri, 7 Jun 2019 14:43:06 +0530 [thread overview] Message-ID: <1559898786-28530-3-git-send-email-anshuman.khandual@arm.com> (raw) In-Reply-To: <1559898786-28530-1-git-send-email-anshuman.khandual@arm.com> __do_page_fault() is over complicated with multiple goto statements. This cleans up the code flow and while there drops local variable vm_fault_t. Signed-off-by: Anshuman Khandual <anshuman.khandual@arm.com> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Will Deacon <will.deacon@arm.com> Cc: Mark Rutland <mark.rutland@arm.com> Cc: James Morse <james.morse@arm.com> Cc: Andrey Konovalov <andreyknvl@google.com> Cc: Christoph Hellwig <hch@infradead.org> --- arch/arm64/mm/fault.c | 30 +++++++++++------------------- 1 file changed, 11 insertions(+), 19 deletions(-) diff --git a/arch/arm64/mm/fault.c b/arch/arm64/mm/fault.c index 95cac4a..235b7c0 100644 --- a/arch/arm64/mm/fault.c +++ b/arch/arm64/mm/fault.c @@ -397,37 +397,29 @@ static void do_bad_area(unsigned long addr, unsigned int esr, struct pt_regs *re static vm_fault_t __do_page_fault(struct mm_struct *mm, unsigned long addr, unsigned int mm_flags, unsigned long vm_flags) { - struct vm_area_struct *vma; - vm_fault_t fault; + struct vm_area_struct *vma = find_vma(mm, addr); - vma = find_vma(mm, addr); - fault = VM_FAULT_BADMAP; if (unlikely(!vma)) - goto out; - if (unlikely(vma->vm_start > addr)) - goto check_stack; + return VM_FAULT_BADMAP; /* * Ok, we have a good vm_area for this memory access, so we can handle * it. */ -good_area: + if (unlikely(vma->vm_start > addr)) { + if (!(vma->vm_flags & VM_GROWSDOWN)) + return VM_FAULT_BADMAP; + if (expand_stack(vma, addr)) + return VM_FAULT_BADMAP; + } + /* * Check that the permissions on the VMA allow for the fault which * occurred. */ - if (!(vma->vm_flags & vm_flags)) { - fault = VM_FAULT_BADACCESS; - goto out; - } - + if (!(vma->vm_flags & vm_flags)) + return VM_FAULT_BADACCESS; return handle_mm_fault(vma, addr & PAGE_MASK, mm_flags); - -check_stack: - if (vma->vm_flags & VM_GROWSDOWN && !expand_stack(vma, addr)) - goto good_area; -out: - return fault; } static bool is_el0_instruction_abort(unsigned int esr) -- 2.7.4 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
next prev parent reply other threads:[~2019-06-07 9:13 UTC|newest] Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top 2019-06-07 9:13 [PATCH V3 0/2] arm64/mm: Clean ups for do_page_fault() Anshuman Khandual 2019-06-07 9:13 ` Anshuman Khandual 2019-06-07 9:13 ` [PATCH V3 1/2] arm64/mm: Consolidate page fault information capture Anshuman Khandual 2019-06-07 9:13 ` Anshuman Khandual 2019-06-07 10:30 ` Mark Rutland 2019-06-07 10:30 ` Mark Rutland 2019-06-07 13:34 ` Catalin Marinas 2019-06-07 13:34 ` Catalin Marinas 2019-06-07 9:13 ` Anshuman Khandual [this message] 2019-06-07 9:13 ` [PATCH V3 2/2] arm64/mm: Refactor __do_page_fault() Anshuman Khandual 2019-06-07 10:23 ` Mark Rutland 2019-06-07 10:23 ` Mark Rutland
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