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perf/core: Remove retry loop from perf_mmap()
AFAICT there is no actual benefit from the mutex drop on re-try. The 'worst' case scenario is that we instantly re-gain the mutex without perf_mmap_close() getting it. So might as well make that the normal case. Reflow the code to make the ring buffer detach case naturally flow into the no ring buffer case. [ mingo: Forward ported it ] 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/20241104135519.463607258@infradead.org
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