perf/core: Lift event->mmap_mutex in perf_mmap()
This puts 'all' of perf_mmap() under single event->mmap_mutex. Signed-off-by:Peter Zijlstra (Intel) <peterz@infradead.org> Signed-off-by:
Ingo Molnar <mingo@kernel.org> Reviewed-by:
Ravi Bangoria <ravi.bangoria@amd.com> Link: https://lore.kernel.org/r/20241104135519.582252957@infradead.org
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