Messages in this thread Patch in this message | | | From | Kefeng Wang <> | Subject | [PATCH Resend v2 2/3] ARM: mm: Provide is_write_fault() | Date | Mon, 15 Nov 2021 21:48:47 +0800 |
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The function will check whether the fault is caused by a write access, it will be called in die_kernel_fault() too in next patch, so put it before the function of die_kernel_fault().
Acked-by: Marco Elver <elver@google.com> 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..1207ed925039 100644 --- a/arch/arm/mm/fault.c +++ b/arch/arm/mm/fault.c @@ -99,6 +99,11 @@ void show_pte(const char *lvl, struct mm_struct *mm, unsigned long addr) { } #endif /* CONFIG_MMU */ +static inline bool is_write_fault(unsigned int fsr) +{ + return (fsr & FSR_WRITE) && !(fsr & FSR_CM); +} + static void die_kernel_fault(const char *msg, struct mm_struct *mm, unsigned long addr, unsigned int fsr, 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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