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| author | Dmitry Ilvokhin <d@ilvokhin.com> | 2026-08-04 07:15:44 +0000 |
|---|---|---|
| committer | Peter Zijlstra <peterz@infradead.org> | 2026-08-07 17:58:10 +0200 |
| commit | b359800c6970cb653d41ed2af18fd8e95dbb822f (patch) | |
| tree | eeb7f6dc911982d69ab277296faec8fdaee8043f /kernel/locking | |
| parent | f7e2cb6d495aa1a88368650970a230b45870859b (diff) | |
| download | linux-next-b359800c6970cb653d41ed2af18fd8e95dbb822f.tar.gz linux-next-b359800c6970cb653d41ed2af18fd8e95dbb822f.zip | |
tracing/lock: Use TRACE_EVENT_FN() for contended_release
queued_spin_unlock() gates its contended_release trace call behind a
static branch, so a NOP sits on the unlock path even while the
tracepoint is disabled. Removing that requires replacing the unlock
implementation only while contended_release is enabled, which needs a
callback when the tracepoint is toggled.
Convert contended_release to TRACE_EVENT_FN() and add weak no-op
arch_contended_release_trace_reg()/arch_contended_release_trace_unreg()
hooks.
The default hooks are empty, so this is a no-op until an architecture
overrides them.
No functional change intended.
Signed-off-by: Dmitry Ilvokhin <d@ilvokhin.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: Juergen Gross <jgross@suse.com>
Link: https://patch.msgid.link/1c2fcccfb584c075c02890c484f22c76a1948bf1.1785778551.git.d@ilvokhin.com
Diffstat (limited to 'kernel/locking')
| -rw-r--r-- | kernel/locking/mutex.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/kernel/locking/mutex.c b/kernel/locking/mutex.c index 8a85912d7ee6..942a939cee95 100644 --- a/kernel/locking/mutex.c +++ b/kernel/locking/mutex.c @@ -1272,6 +1272,10 @@ EXPORT_TRACEPOINT_SYMBOL_GPL(contention_begin); EXPORT_TRACEPOINT_SYMBOL_GPL(contention_end); EXPORT_TRACEPOINT_SYMBOL_GPL(contended_release); +__weak int arch_contended_release_trace_reg(void) { return 0; } + +__weak void arch_contended_release_trace_unreg(void) { } + /** * atomic_dec_and_mutex_lock - return holding mutex if we dec to 0 * @cnt: the atomic which we are to dec |