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authorPeter Zijlstra <peterz@infradead.org>2020-12-18 16:39:14 +0100
committerPeter Zijlstra <peterz@infradead.org>2020-12-18 16:53:13 +0100
commit91ea62d58bd661827c328a2c6c02a87fa4aae88b (patch)
tree531563294d9ea18a4b4797b91fafee39d3a5f720 /kernel
parent441fa3409769180df2fd12fcada35441435a120c (diff)
softirq: Avoid bad tracing / lockdep interaction
Similar to commit: 1a63dcd8765b ("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
Diffstat (limited to 'kernel')
-rw-r--r--kernel/softirq.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/kernel/softirq.c b/kernel/softirq.c
index 09229ad82209..0f1d3a32d53b 100644
--- a/kernel/softirq.c
+++ b/kernel/softirq.c
@@ -185,7 +185,7 @@ void __local_bh_enable_ip(unsigned long ip, unsigned int cnt)
* Keep preemption disabled until we are done with
* softirq processing:
*/
- preempt_count_sub(cnt - 1);
+ __preempt_count_sub(cnt - 1);
if (unlikely(!in_interrupt() && local_softirq_pending())) {
/*