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ARM: 9165/1: mm: Provide is_write_fault()

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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>
Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
This commit is contained in:
Wang Kefeng
2021-12-03 10:26:32 +01:00
committed by Russell King (Oracle)
parent 0ba8695e3d
commit 3c341b2174
1 changed files with 6 additions and 1 deletions
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7
arch/arm/mm/fault.c
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@@ -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;
}