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| author |   Thomas Gleixner <tglx@linutronix.de> | 2018-03-20 10:56:18 +0100 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2018-03-20 10:56:18 +0100 |
| commit | edc39c9b4589a4ce9a69273b5a27a1459c3423d4 (patch) | |
| tree | e5850fe4a533579b0de12c02e48f7dcdd60e8e38 /include/linux/compiler-gcc.h | |
| parent | x86/build: Drop superfluous ALIGN from the linker script (diff) | |
| parent | Merge branch 'for-4.16-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup (diff) | |
| download | wireguard-linux-edc39c9b4589a4ce9a69273b5a27a1459c3423d4.tar.xz wireguard-linux-edc39c9b4589a4ce9a69273b5a27a1459c3423d4.zip | |
Merge branch 'linus' into x86/build to pick up dependencies
Diffstat (limited to '')
| -rw-r--r-- | include/linux/compiler-gcc.h | 19 |
1 files changed, 18 insertions, 1 deletions
diff --git a/include/linux/compiler-gcc.h b/include/linux/compiler-gcc.h index 73bc63e0a1c4..e2c7f4369eff 100644 --- a/include/linux/compiler-gcc.h +++ b/include/linux/compiler-gcc.h @@ -93,6 +93,10 @@ #define __weak __attribute__((weak)) #define __alias(symbol) __attribute__((alias(#symbol))) +#ifdef RETPOLINE +#define __noretpoline __attribute__((indirect_branch("keep"))) +#endif + /* * it doesn't make sense on ARM (currently the only user of __naked) * to trace naked functions because then mcount is called without @@ -208,6 +212,15 @@ #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 +230,11 @@ * 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"))) |