Commit 0f1ba9a2 authored by Heiko Carstens's avatar Heiko Carstens Committed by Ingo Molnar

softirq/preempt: Add missing current->preempt_disable_ip update

While debugging some "sleeping function called from invalid context" bug I
realized that the debugging message "Preemption disabled at:" pointed to
an incorrect function.

In particular if the last function/action that disabled preemption was
spin_lock_bh() then current->preempt_disable_ip won't be updated.

The reason for this is that __local_bh_disable_ip() will increase
preempt_count manually instead of calling preempt_count_add(), which
would handle the update correctly.

It look like the manual handling was done to work around some lockdep issue.

So add the missing update of current->preempt_disable_ip to
__local_bh_disable_ip() as well.
Signed-off-by: default avatarHeiko Carstens <>
Signed-off-by: default avatarPeter Zijlstra (Intel) <>
Cc: Paul E. McKenney <>
Cc: Andrew Morton <>
Cc: Linus Torvalds <>
Link: default avatarIngo Molnar <>
parent 036cc30c
......@@ -114,8 +114,12 @@ void __local_bh_disable_ip(unsigned long ip, unsigned int cnt)
if (preempt_count() == cnt)
if (preempt_count() == cnt) {
current->preempt_disable_ip = get_parent_ip(CALLER_ADDR1);
trace_preempt_off(CALLER_ADDR0, get_parent_ip(CALLER_ADDR1));
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