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| author | Peter Zijlstra <peterz@infradead.org> | 2022-09-15 13:11:25 +0200 |
|---|---|---|
| committer | Peter Zijlstra <peterz@infradead.org> | 2022-10-17 16:41:14 +0200 |
| commit | 770ae1b709528a6a173b5c7b183818ee9b45e376 (patch) | |
| tree | 32e60c4fe4e050c253f981ed2ae7af00e2d51f77 /arch/x86/include/asm/nospec-branch.h | |
| parent | x86/modules: Add call patching (diff) | |
| download | linux-770ae1b709528a6a173b5c7b183818ee9b45e376.tar.xz linux-770ae1b709528a6a173b5c7b183818ee9b45e376.zip | |
x86/returnthunk: Allow different return thunks
In preparation for call depth tracking on Intel SKL CPUs, make it possible
to patch in a SKL specific return thunk.
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lore.kernel.org/r/20220915111147.680469665@infradead.org
Diffstat (limited to 'arch/x86/include/asm/nospec-branch.h')
| -rw-r--r-- | arch/x86/include/asm/nospec-branch.h | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/arch/x86/include/asm/nospec-branch.h b/arch/x86/include/asm/nospec-branch.h index c936ce9f0c47..f10ca334dd75 100644 --- a/arch/x86/include/asm/nospec-branch.h +++ b/arch/x86/include/asm/nospec-branch.h @@ -208,6 +208,12 @@ extern void __x86_return_thunk(void); extern void zen_untrain_ret(void); extern void entry_ibpb(void); +#ifdef CONFIG_CALL_THUNKS +extern void (*x86_return_thunk)(void); +#else +#define x86_return_thunk (&__x86_return_thunk) +#endif + #ifdef CONFIG_RETPOLINE #define GEN(reg) \ |