csky: Fixup wrong update_mmu_cache implementation

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In our stress test, we found some crash problem caused by:

if (!(vma->vm_flags & VM_EXEC))
	return;

in update_mmu_cache().

Seems current update_mmu_cache implementation is wrong and we retread
to the conservative implementation.

Also the usage of kmap_atomic in update_mmu_cache is risky, page-virtual
may be scheduled out and changed, so we must use preempt_disable &
pagefault_disable which is called by kmap_atomic().

Signed-off-by: Guo Ren <ren_guo@c-sky.com>
Cc: Arnd Bergmann <arnd@arndb.de>

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This commit is contained in:

Guo Ren 2019-04-10 10:55:07 +08:00

parent f62e31623d

commit 981bbf274b

1 changed files with 2 additions and 11 deletions

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13

arch/csky/abiv2/cacheflush.c

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