On Tue, Aug 05, 2025 at 01:51:40PM -0400, Zi Yan wrote:
>FORCE_READ() converts input value x to its pointer type then reads from
>address x. This is wrong. If x is a non-pointer, it would be caught it
>easily. But all FORCE_READ() callers are trying to read from a pointer and
>FORCE_READ() basically reads a pointer to a pointer instead of the original
>typed pointer. Almost no access violation was found, except the one from
>split_huge_page_test.
>
>Fix it by implementing a simplified READ_ONCE() instead.
>
>Fixes: 3f6bfd4789a0 ("selftests/mm: reuse FORCE_READ to replace "asm
>volatile("" : "+r" (XXX));"")
>Signed-off-by: Zi Yan <[email protected]>
>---
Reviewed-by: Wei Yang <[email protected]>
--
Wei Yang
Help you, Help me
