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| author | Qiang Zhang <qiang4.zhang@intel.com> | 2024-03-12 09:04:23 +0100 |
|---|---|---|
| committer | Andrew Morton <akpm@linux-foundation.org> | 2024-03-13 20:12:21 +0100 |
| commit | 82634d7e24271698e50a3ec811e5f50de790a65f (patch) | |
| tree | 88e8df0a2e1f7e85cb355d137e5ae7e349f6c985 | |
| parent | mm: prohibit the last subpage from reusing the entire large folio (diff) | |
| download | linux-82634d7e24271698e50a3ec811e5f50de790a65f.tar.xz linux-82634d7e24271698e50a3ec811e5f50de790a65f.zip | |
memtest: use {READ,WRITE}_ONCE in memory scanning
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/20240312080422.691222-1-qiang4.zhang@intel.com
Signed-off-by: Qiang Zhang <qiang4.zhang@intel.com>
Cc: Bill Wendling <morbo@google.com>
Cc: Justin Stitt <justinstitt@google.com>
Cc: Nathan Chancellor <nathan@kernel.org>
Cc: Nick Desaulniers <ndesaulniers@google.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
| -rw-r--r-- | mm/memtest.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/mm/memtest.c b/mm/memtest.c index 32f3e9dda837..c2c609c39119 100644 --- a/mm/memtest.c +++ b/mm/memtest.c @@ -51,10 +51,10 @@ 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; |