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| author | Uros Bizjak <ubizjak@gmail.com> | 2024-03-19 13:40:12 +0300 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2024-03-19 15:15:34 +0300 |
| commit | a3ff53167cef2b5c6c8948246172d6f9279f037f (patch) | |
| tree | 011ca9e0a865e1e7d27d31747c60408ed28fd71e /arch/x86/include/asm/special_insns.h | |
| parent | 4ae3dc83b047d51485cce1a72be277a110d77c91 (diff) | |
| download | linux-a3ff53167cef2b5c6c8948246172d6f9279f037f.tar.xz | |
x86/asm: Remove %P operand modifier from altinstr asm templates
The "P" asm operand modifier is a x86 target-specific modifier.
For x86_64, when used with a symbol reference, the "%P" modifier
emits "sym" instead of "sym(%rip)". This property is currently
used to prevent %RIP-relative addressing in .altinstr sections.
%RIP-relative addresses are nowadays correctly handled in .altinstr
sections, so remove %P operand modifier from altinstr asm templates.
Also note that unlike GCC, clang emits %rip-relative symbol
reference with "P" asm operand modifier, so the patch also unifies
symbol handling with both compilers.
No functional changes intended.
Signed-off-by: Uros Bizjak <ubizjak@gmail.com>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Ard Biesheuvel <ardb@kernel.org>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Link: https://lore.kernel.org/r/20240319104418.284519-2-ubizjak@gmail.com
Diffstat (limited to 'arch/x86/include/asm/special_insns.h')
| -rw-r--r-- | arch/x86/include/asm/special_insns.h | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/arch/x86/include/asm/special_insns.h b/arch/x86/include/asm/special_insns.h index 2e9fc5c400cd..0ee2ba589492 100644 --- a/arch/x86/include/asm/special_insns.h +++ b/arch/x86/include/asm/special_insns.h @@ -182,8 +182,8 @@ static __always_inline void clflush(volatile void *__p) static inline void clflushopt(volatile void *__p) { - alternative_io(".byte 0x3e; clflush %P0", - ".byte 0x66; clflush %P0", + alternative_io(".byte 0x3e; clflush %0", + ".byte 0x66; clflush %0", X86_FEATURE_CLFLUSHOPT, "+m" (*(volatile char __force *)__p)); } |