Messages in this thread Patch in this message | | | From | Kefeng Wang <> | Subject | [PATCH v2 2/3] ARM: mm: Provide is_write_fault() | Date | Wed, 3 Nov 2021 21:38:44 +0800 |
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The function will check whether the fault is caused by a write access.
Signed-off-by: Kefeng Wang <wangkefeng.wang@huawei.com> --- arch/arm/mm/fault.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-)
diff --git a/arch/arm/mm/fault.c b/arch/arm/mm/fault.c index bc8779d54a64..f7ab6dabe89f 100644 --- a/arch/arm/mm/fault.c +++ b/arch/arm/mm/fault.c @@ -207,6 +207,11 @@ static inline bool is_permission_fault(unsigned int fsr) return false; } +static inline bool is_write_fault(unsigned int fsr) +{ + return (fsr & FSR_WRITE) && !(fsr & FSR_CM); +} + static vm_fault_t __kprobes __do_page_fault(struct mm_struct *mm, unsigned long addr, unsigned int flags, unsigned long vma_flags, struct pt_regs *regs) @@ -261,7 +266,7 @@ do_page_fault(unsigned long addr, unsigned int fsr, struct pt_regs *regs) if (user_mode(regs)) flags |= FAULT_FLAG_USER; - if ((fsr & FSR_WRITE) && !(fsr & FSR_CM)) { + if (is_write_fault(fsr)) { flags |= FAULT_FLAG_WRITE; vm_flags = VM_WRITE; } -- 2.26.2
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