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| author | Ingo Molnar <mingo@kernel.org> | 2018-12-19 13:20:57 +0300 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2018-12-19 14:00:04 +0300 |
| commit | 851a4cd7cc11fcebfa833824415fc57cf180cadf (patch) | |
| tree | d5af0ff0135be373e7f8ba0180a72fb7754fb38d /arch/x86 | |
| parent | ffb61c6346d0f02b2a03377a3edac838c1f09b45 (diff) | |
| download | linux-851a4cd7cc11fcebfa833824415fc57cf180cadf.tar.xz | |
Revert "x86/alternatives: Macrofy lock prefixes to work around GCC inlining bugs"
This reverts commit 77f48ec28e4ccff94d2e5f4260a83ac27a7f3099.
See this commit for details about the revert:
e769742d3584 ("Revert "x86/jump-labels: Macrofy inline assembly code to work around GCC inlining bugs"")
Reported-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Reviewed-by: Borislav Petkov <bp@alien8.de>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Juergen Gross <jgross@suse.com>
Cc: Richard Biener <rguenther@suse.de>
Cc: Kees Cook <keescook@chromium.org>
Cc: Segher Boessenkool <segher@kernel.crashing.org>
Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Nadav Amit <namit@vmware.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'arch/x86')
| -rw-r--r-- | arch/x86/include/asm/alternative-asm.h | 20 | ||||
| -rw-r--r-- | arch/x86/include/asm/alternative.h | 11 | ||||
| -rw-r--r-- | arch/x86/kernel/macros.S | 1 |
3 files changed, 15 insertions, 17 deletions
diff --git a/arch/x86/include/asm/alternative-asm.h b/arch/x86/include/asm/alternative-asm.h index 8e4ea39e55d0..31b627b43a8e 100644 --- a/arch/x86/include/asm/alternative-asm.h +++ b/arch/x86/include/asm/alternative-asm.h @@ -7,24 +7,16 @@ #include <asm/asm.h> #ifdef CONFIG_SMP -.macro LOCK_PREFIX_HERE + .macro LOCK_PREFIX +672: lock .pushsection .smp_locks,"a" .balign 4 - .long 671f - . # offset + .long 672b - . .popsection -671: -.endm - -.macro LOCK_PREFIX insn:vararg - LOCK_PREFIX_HERE - lock \insn -.endm + .endm #else -.macro LOCK_PREFIX_HERE -.endm - -.macro LOCK_PREFIX insn:vararg -.endm + .macro LOCK_PREFIX + .endm #endif /* diff --git a/arch/x86/include/asm/alternative.h b/arch/x86/include/asm/alternative.h index d7faa16622d8..4cd6a3b71824 100644 --- a/arch/x86/include/asm/alternative.h +++ b/arch/x86/include/asm/alternative.h @@ -31,8 +31,15 @@ */ #ifdef CONFIG_SMP -#define LOCK_PREFIX_HERE "LOCK_PREFIX_HERE\n\t" -#define LOCK_PREFIX "LOCK_PREFIX " +#define LOCK_PREFIX_HERE \ + ".pushsection .smp_locks,\"a\"\n" \ + ".balign 4\n" \ + ".long 671f - .\n" /* offset */ \ + ".popsection\n" \ + "671:" + +#define LOCK_PREFIX LOCK_PREFIX_HERE "\n\tlock; " + #else /* ! CONFIG_SMP */ #define LOCK_PREFIX_HERE "" #define LOCK_PREFIX "" diff --git a/arch/x86/kernel/macros.S b/arch/x86/kernel/macros.S index 852487a9fc56..f1fe1d570365 100644 --- a/arch/x86/kernel/macros.S +++ b/arch/x86/kernel/macros.S @@ -8,4 +8,3 @@ #include <linux/compiler.h> #include <asm/refcount.h> -#include <asm/alternative-asm.h> |