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memtest: use {READ,WRITE}_ONCE in memory scanning

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[ Upstream commit 82634d7e24271698e50a3ec811e5f50de790a65f ]

memtest failed to find bad memory when compiled with clang.  So use
{WRITE,READ}_ONCE to access memory to avoid compiler over optimization.

Link: https://lkml.kernel.org/r/[email protected]
Signed-off-by: Qiang Zhang <[email protected]>
Cc: Bill Wendling <[email protected]>
Cc: Justin Stitt <[email protected]>
Cc: Nathan Chancellor <[email protected]>
Cc: Nick Desaulniers <[email protected]>
Cc: <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Sasha Levin <[email protected]>
This commit is contained in:
Qiang Zhang 2024-03-12 16:04:23 +08:00 • committed by Greg Kroah-Hartman
commit f2cee08a69
1 changed files with 2 additions and 2 deletions
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4
mm/memtest.c
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@ -46,10 +46,10 @@ static void __init memtest(u64 pattern, phys_addr_t start_phys, phys_addr_t size
last_bad = 0;
for (p = start; p < end; p++)
*p = pattern;
WRITE_ONCE(*p, pattern);
for (p = start; p < end; p++, start_phys_aligned += incr) {
if (*p == pattern)
if (READ_ONCE(*p) == pattern)
continue;
if (start_phys_aligned == last_bad + incr) {
last_bad += incr;