static_call: Add call depth tracking support

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When indirect calls are switched to direct calls then it has to be ensured
that the call target is not the function, but the call thunk when call
depth tracking is enabled. But static calls are available before call
thunks have been set up.

Ensure a second run through the static call patching code after call thunks
have been created. When call thunks are not enabled this has no side
effects.

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/20220915111148.306100465@infradead.org

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This commit is contained in:

Peter Zijlstra 2022-09-15 13:11:31 +02:00

parent f5c1bb2afe

commit 7825451fa4

5 changed files with 44 additions and 5 deletions

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5

arch/x86/include/asm/alternative.h

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18

arch/x86/kernel/callthunks.c

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1

arch/x86/kernel/static_call.c

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2

include/linux/static_call.h

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23

kernel/static_call_inline.c

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