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softirq: Avoid bad tracing / lockdep interaction
Similar to commit:
1a63dcd876
("softirq: Reorder trace_softirqs_on to prevent lockdep splat")
__local_bh_enable_ip() can also call into tracing with inconsistent
state. Unlike that commit we don't need to bother about the tracepoint
because 'cnt-1' never matches preempt_count() (by construction).
Reported-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Tested-by: Heiko Carstens <hca@linux.ibm.com>
Link: https://lkml.kernel.org/r/20201218154519.GW3092@hirez.programming.kicks-ass.net
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parent
441fa34097
commit
91ea62d58b
@ -185,7 +185,7 @@ void __local_bh_enable_ip(unsigned long ip, unsigned int cnt)
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* Keep preemption disabled until we are done with
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* softirq processing:
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*/
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preempt_count_sub(cnt - 1);
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__preempt_count_sub(cnt - 1);
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if (unlikely(!in_interrupt() && local_softirq_pending())) {
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/*
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