perf: Identify the 0->1 transition for event::mmap_count

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Needed because refcount_inc() doesn't allow the 0->1 transition.

Specifically, this is the case where we've created the RB, this means
there was no RB, and as such there could not have been an mmap.
Additionally we hold mmap_mutex to serialize everything.

This must be the first.

Suggested-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lore.kernel.org/r/20250812104019.956479989@infradead.org

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Peter Zijlstra 2025-08-12 12:39:12 +02:00

parent d23a6dbc0a

commit 59741451b4

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kernel/events/core.c

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