perf: Fix get_recursion_context()
One should use in_serving_softirq() to detect SoftIRQ context. Fixes: 96f6d444 ("perf_counter: avoid recursion") Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Link: https://lkml.kernel.org/r/20201030151955.120572175@infradead.org
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