diff options
| author | Uros Bizjak <ubizjak@gmail.com> | 2025-09-07 20:33:38 +0200 |
|---|---|---|
| committer | Borislav Petkov (AMD) <bp@alien8.de> | 2025-09-08 15:38:06 +0200 |
| commit | c6c973dbfa5e34b1572bcd1852adcad1b5d08fab (patch) | |
| tree | d7f0dfbf593ee77c79d6d3efe69c5877c446de98 /arch/x86/boot/bitops.h | |
| parent | 13bdfb53aa04eeb8022af87288c5bc0a5d13a834 (diff) | |
x86/asm: Remove code depending on __GCC_ASM_FLAG_OUTPUTS__
The minimum supported GCC version is 8.1, which supports flag output operands
and always defines __GCC_ASM_FLAG_OUTPUTS__ macro.
Remove code depending on __GCC_ASM_FLAG_OUTPUTS__ and use the "=@ccCOND" flag
output operand directly.
Use the equivalent "=@ccz" instead of "=@cce" flag output operand for
CMPXCHG8B and CMPXCHG16B instructions. These instructions set a single flag
bit - the Zero flag - and "=@ccz" is used to distinguish the CC user from
comparison instructions, where set ZERO flag indeed means that the values are
equal.
Signed-off-by: Uros Bizjak <ubizjak@gmail.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Link: https://lore.kernel.org/r/20250905121723.GCaLrU04lP2A50PT-B@fat_crate.local
Diffstat (limited to 'arch/x86/boot/bitops.h')
| -rw-r--r-- | arch/x86/boot/bitops.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/x86/boot/bitops.h b/arch/x86/boot/bitops.h index 8518ae214c9b..79e15971529d 100644 --- a/arch/x86/boot/bitops.h +++ b/arch/x86/boot/bitops.h @@ -27,7 +27,7 @@ static inline bool variable_test_bit(int nr, const void *addr) bool v; const u32 *p = addr; - asm("btl %2,%1" CC_SET(c) : CC_OUT(c) (v) : "m" (*p), "Ir" (nr)); + asm("btl %2,%1" : "=@ccc" (v) : "m" (*p), "Ir" (nr)); return v; } |