diff options
| author | Maxime Ripard <mripard@kernel.org> | 2024-02-26 17:23:00 +0300 |
|---|---|---|
| committer | Maxime Ripard <mripard@kernel.org> | 2024-02-26 17:23:00 +0300 |
| commit | 2f910859724b53f1cd3579246e3d9bebb16d78b8 (patch) | |
| tree | 75cd2329b7e737865bf28ea734a2e0649c02a5bf /include/linux/compiler-gcc.h | |
| parent | 86bf8cfda6d2a6720fa2e6e676c98f0882c9d3d7 (diff) | |
| parent | 72fa02fdf83306c52bc1eede28359e3fa32a151a (diff) | |
| download | linux-2f910859724b53f1cd3579246e3d9bebb16d78b8.tar.xz | |
Merge drm/drm-fixes into drm-misc-fixes
Sima needs a more recent release to apply a patch.
Signed-off-by: Maxime Ripard <mripard@kernel.org>
Diffstat (limited to 'include/linux/compiler-gcc.h')
| -rw-r--r-- | include/linux/compiler-gcc.h | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/include/linux/compiler-gcc.h b/include/linux/compiler-gcc.h index aebb65bf95a7..75bd1692d2e3 100644 --- a/include/linux/compiler-gcc.h +++ b/include/linux/compiler-gcc.h @@ -64,6 +64,26 @@ __builtin_unreachable(); \ } while (0) +/* + * GCC 'asm goto' with outputs miscompiles certain code sequences: + * + * https://gcc.gnu.org/bugzilla/show_bug.cgi?id=113921 + * + * Work around it 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 + */ +#ifdef CONFIG_GCC_ASM_GOTO_OUTPUT_WORKAROUND +#define asm_goto_output(x...) \ + do { asm volatile goto(x); asm (""); } while (0) +#endif + #if defined(CONFIG_ARCH_USE_BUILTIN_BSWAP) #define __HAVE_BUILTIN_BSWAP32__ #define __HAVE_BUILTIN_BSWAP64__ |