x86/returnthunk: Allow different return thunks

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Upstream commit: 770ae1b709

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
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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This commit is contained in:

Peter Zijlstra 2022-09-15 13:11:25 +02:00 • committed by Greg Kroah-Hartman

parent 786f089086

commit 1221b8ea25

5 changed files with 22 additions and 7 deletions

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6

arch/x86/include/asm/nospec-branch.h

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17

arch/x86/kernel/alternative.c

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2

arch/x86/kernel/ftrace.c

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2

arch/x86/kernel/static_call.c

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2

arch/x86/net/bpf_jit_comp.c

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