ARM: mm: fix alignment handler faults under memory pressure

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When the system has high memory pressure, the page containing the
instruction may be paged out.  Using probe_kernel_address() means that
if the page is swapped out, the resulting page fault will not be
handled because page faults are disabled by this function.

Use get_user() to read the instruction instead.

Reported-by: Jing Xiangfeng <jingxiangfeng@huawei.com>
Fixes: b255188f90 ("ARM: fix scheduling while atomic warning in alignment handling code")
Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>

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Russell King 2019-08-31 17:01:58 +01:00

parent 4d856f72c1

commit 67e15fa5b4

1 changed files with 36 additions and 8 deletions

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arch/arm/mm/alignment.c

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