diff options
| author | Linus Torvalds <torvalds@linux-foundation.org> | 2020-05-17 11:08:29 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2020-05-17 11:08:29 -0700 |
| commit | 43567139f5f3808cda4f61c956576f8a4f2232cb (patch) | |
| tree | a878bdae763213bbde2d1deaab2c7a7f102d0d90 /include | |
| parent | 5a9ffb954a3933d7867f4341684a23e008d6839b (diff) | |
| parent | a9a3ed1eff3601b63aea4fb462d8b3b92c7c1e7e (diff) | |
Merge tag 'x86_urgent_for_v5.7-rc7' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull x86 fix from Borislav Petkov:
"A single fix for early boot crashes of kernels built with gcc10 and
stack protector enabled"
* tag 'x86_urgent_for_v5.7-rc7' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
x86: Fix early boot crash on gcc-10, third try
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/compiler.h | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/include/linux/compiler.h b/include/linux/compiler.h index 034b0a644efc..448c91bf543b 100644 --- a/include/linux/compiler.h +++ b/include/linux/compiler.h @@ -356,4 +356,10 @@ static inline void *offset_to_ptr(const int *off) /* &a[0] degrades to a pointer: a different type from an array */ #define __must_be_array(a) BUILD_BUG_ON_ZERO(__same_type((a), &(a)[0])) +/* + * This is needed in functions which generate the stack canary, see + * arch/x86/kernel/smpboot.c::start_secondary() for an example. + */ +#define prevent_tail_call_optimization() mb() + #endif /* __LINUX_COMPILER_H */ |