From: Kefeng Wang <wangkefeng.wang@huawei.com> hulk inclusion category: feature bugzilla: 181005 https://gitee.com/openeuler/kernel/issues/I4EUY7 ----------------------------------------------- The function will check whether the fault is caused by a write access. Signed-off-by: Kefeng Wang <wangkefeng.wang@huawei.com> Signed-off-by: Peng Liu <liupeng256@huawei.com> Reviewed-by: Kefeng Wang <wangkefeng.wang@huawei.com> Signed-off-by: Chen Jun <chenjun102@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 64df4c6cfb8d..792a99f66c55 100644 --- a/arch/arm/mm/fault.c +++ b/arch/arm/mm/fault.c @@ -112,6 +112,11 @@ 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) @@ -274,7 +279,7 @@ 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; } -- 2.20.1