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| author | Thomas Gleixner <tglx@linutronix.de> | 2022-09-15 13:11:30 +0200 |
|---|---|---|
| committer | Peter Zijlstra <peterz@infradead.org> | 2022-10-17 16:41:16 +0200 |
| commit | f5c1bb2afe93396d41c5cbdcb909b08a75b8dde4 (patch) | |
| tree | ea7d2c0ffd9a4c54bb865b0b3fdccbfb21f4189a /arch/x86/lib | |
| parent | x86/retbleed: Add SKL call thunk (diff) | |
| download | linux-f5c1bb2afe93396d41c5cbdcb909b08a75b8dde4.tar.xz linux-f5c1bb2afe93396d41c5cbdcb909b08a75b8dde4.zip | |
x86/calldepth: Add ret/call counting for debug
Add a debuigfs mechanism to validate the accounting, e.g. vs. call/ret
balance and to gather statistics about the stuffing to call ratio.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lore.kernel.org/r/20220915111148.204285506@infradead.org
Diffstat (limited to 'arch/x86/lib')
| -rw-r--r-- | arch/x86/lib/retpoline.S | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/arch/x86/lib/retpoline.S b/arch/x86/lib/retpoline.S index e00206077ae9..5f61c65322be 100644 --- a/arch/x86/lib/retpoline.S +++ b/arch/x86/lib/retpoline.S @@ -203,13 +203,18 @@ EXPORT_SYMBOL(__x86_return_thunk) .align 64 SYM_FUNC_START(__x86_return_skl) ANNOTATE_NOENDBR - /* Keep the hotpath in a 16byte I-fetch */ + /* + * Keep the hotpath in a 16byte I-fetch for the non-debug + * case. + */ + CALL_THUNKS_DEBUG_INC_RETS shlq $5, PER_CPU_VAR(pcpu_hot + X86_call_depth) jz 1f ANNOTATE_UNRET_SAFE ret int3 1: + CALL_THUNKS_DEBUG_INC_STUFFS .rept 16 ANNOTATE_INTRA_FUNCTION_CALL call 2f |