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| author | David S. Miller <davem@davemloft.net> | 2018-02-24 00:04:20 -0500 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2018-02-24 00:04:20 -0500 |
| commit | f74290fdb363665538743d14c4f00aeacdb68d87 (patch) | |
| tree | a5c8f6332f06550e935d1e557ac927302f7f63c4 /include/linux/compiler-gcc.h | |
| parent | 1b71af6053af1bd2f849e9fda4f71c1e3f145dcf (diff) | |
| parent | 9cb9c07d6b0c5fd97d83b8ab14d7e308ba4b612f (diff) | |
Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net
Diffstat (limited to 'include/linux/compiler-gcc.h')
| -rw-r--r-- | include/linux/compiler-gcc.h | 15 |
1 files changed, 14 insertions, 1 deletions
diff --git a/include/linux/compiler-gcc.h b/include/linux/compiler-gcc.h index 73bc63e0a1c4..901c1ccb3374 100644 --- a/include/linux/compiler-gcc.h +++ b/include/linux/compiler-gcc.h @@ -208,6 +208,15 @@ #endif /* + * calling noreturn functions, __builtin_unreachable() and __builtin_trap() + * confuse the stack allocation in gcc, leading to overly large stack + * frames, see https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82365 + * + * Adding an empty inline assembly before it works around the problem + */ +#define barrier_before_unreachable() asm volatile("") + +/* * Mark a position in code as unreachable. This can be used to * suppress control flow warnings after asm blocks that transfer * control elsewhere. @@ -217,7 +226,11 @@ * unreleased. Really, we need to have autoconf for the kernel. */ #define unreachable() \ - do { annotate_unreachable(); __builtin_unreachable(); } while (0) + do { \ + annotate_unreachable(); \ + barrier_before_unreachable(); \ + __builtin_unreachable(); \ + } while (0) /* Mark a function definition as prohibited from being cloned. */ #define __noclone __attribute__((__noclone__, __optimize__("no-tracer"))) |