[PATCH 2/4] ARM: mm: Provide is_write_fault()
From: Kefeng Wang <hidden>
Date: 2021-08-25 09:17:28
Also in:
lkml
Subsystem:
arm port, the rest · Maintainers:
Russell King, Linus Torvalds
The function will check whether the fault is caused by a write access. Signed-off-by: Kefeng Wang <redacted> --- 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
_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel