diff options
| author | Ingo Molnar <mingo@kernel.org> | 2024-02-14 10:45:07 +0100 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2024-02-14 10:45:07 +0100 |
| commit | 03c11eb3b16dc0058589751dfd91f254be2be613 (patch) | |
| tree | e5f2889212fec0bb0babdce9abd781ab487e246a /include/linux/compiler-gcc.h | |
| parent | de8c6a352131f642b82474abe0cbb5dd26a7e081 (diff) | |
| parent | 841c35169323cd833294798e58b9bf63fa4fa1de (diff) | |
Merge tag 'v6.8-rc4' into x86/percpu, to resolve conflicts and refresh the branch
Conflicts:
arch/x86/include/asm/percpu.h
arch/x86/include/asm/text-patching.h
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'include/linux/compiler-gcc.h')
| -rw-r--r-- | include/linux/compiler-gcc.h | 23 |
1 files changed, 20 insertions, 3 deletions
diff --git a/include/linux/compiler-gcc.h b/include/linux/compiler-gcc.h index 7af9e34ec261..c1a963be7d28 100644 --- a/include/linux/compiler-gcc.h +++ b/include/linux/compiler-gcc.h @@ -39,8 +39,6 @@ #define __noretpoline __attribute__((__indirect_branch__("keep"))) #endif -#define __UNIQUE_ID(prefix) __PASTE(__PASTE(__UNIQUE_ID_, prefix), __COUNTER__) - #if defined(LATENT_ENTROPY_PLUGIN) && !defined(__CHECKER__) #define __latent_entropy __attribute__((latent_entropy)) #endif @@ -66,6 +64,25 @@ __builtin_unreachable(); \ } while (0) +/* + * GCC 'asm goto' with outputs miscompiles certain code sequences: + * + * https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110420 + * https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110422 + * + * Work it around via the same compiler barrier quirk that we used + * to use for the old 'asm goto' workaround. + * + * Also, always mark such 'asm goto' statements as volatile: all + * asm goto statements are supposed to be volatile as per the + * documentation, but some versions of gcc didn't actually do + * that for asms with outputs: + * + * https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98619 + */ +#define asm_goto_output(x...) \ + do { asm volatile goto(x); asm (""); } while (0) + #if defined(CONFIG_ARCH_USE_BUILTIN_BSWAP) #define __HAVE_BUILTIN_BSWAP32__ #define __HAVE_BUILTIN_BSWAP64__ @@ -138,7 +155,7 @@ #endif #define __diag_ignore_all(option, comment) \ - __diag_GCC(8, ignore, option) + __diag(__diag_GCC_ignore option) /* * Prior to 9.1, -Wno-alloc-size-larger-than (and therefore the "alloc_size" |