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* [PATCH v3 11/11] x86: msr: Use trace_call__##name() at guarded tracepoint call sites
@ 2026-05-15 14:00 Vineeth Pillai (Google)
  0 siblings, 0 replies; only message in thread
From: Vineeth Pillai (Google) @ 2026-05-15 14:00 UTC (permalink / raw)
  To: Thomas Gleixner, Ingo Molnar, Borislav Petkov, Dave Hansen, x86
  Cc: linux-kernel, Steven Rostedt, linux-trace-kernel, Vineeth Pillai,
	Peter Zijlstra

From: Vineeth Pillai <vineeth@bitbyteword.org>

Replace trace_foo() with the new trace_call__foo() at sites already
guarded by trace_foo_enabled(), avoiding a redundant
static_branch_unlikely() re-evaluation inside the tracepoint.
trace_call__foo() calls the tracepoint callbacks directly without
utilizing the static branch again.

Original v2 series:
https://lore.kernel.org/linux-trace-kernel/20260323160052.17528-1-vineeth@bitbyteword.org/

Parts of the original v2 series have already been merged in mainline.
This patch is being reposted as a follow-up cleanup for the remaining
unmerged pieces.

Suggested-by: Steven Rostedt <rostedt@goodmis.org>
Suggested-by: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Vineeth Pillai (Google) <vineeth@bitbyteword.org>
Assisted-by: Claude:claude-sonnet-4-6
---
 arch/x86/lib/msr.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/arch/x86/lib/msr.c b/arch/x86/lib/msr.c
index dfdd1da89f36..14785fe5e07b 100644
--- a/arch/x86/lib/msr.c
+++ b/arch/x86/lib/msr.c
@@ -125,21 +125,21 @@ EXPORT_SYMBOL_FOR_KVM(msr_clear_bit);
 #ifdef CONFIG_TRACEPOINTS
 void do_trace_write_msr(u32 msr, u64 val, int failed)
 {
-	trace_write_msr(msr, val, failed);
+	trace_call__write_msr(msr, val, failed);
 }
 EXPORT_SYMBOL(do_trace_write_msr);
 EXPORT_TRACEPOINT_SYMBOL(write_msr);
 
 void do_trace_read_msr(u32 msr, u64 val, int failed)
 {
-	trace_read_msr(msr, val, failed);
+	trace_call__read_msr(msr, val, failed);
 }
 EXPORT_SYMBOL(do_trace_read_msr);
 EXPORT_TRACEPOINT_SYMBOL(read_msr);
 
 void do_trace_rdpmc(u32 msr, u64 val, int failed)
 {
-	trace_rdpmc(msr, val, failed);
+	trace_call__rdpmc(msr, val, failed);
 }
 EXPORT_SYMBOL(do_trace_rdpmc);
 EXPORT_TRACEPOINT_SYMBOL(rdpmc);
-- 
2.54.0


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