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author | Heiko Carstens <heiko.carstens@de.ibm.com> | 2015-01-07 10:04:41 +0100 |
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committer | Ingo Molnar <mingo@kernel.org> | 2015-01-14 15:16:21 +0100 |
commit | 0f1ba9a2cea52896448ef4e14a4cb1880b8e5bee (patch) | |
tree | 301b6a4c78620715ea99a35eba30e80a866097e9 /Documentation/locking | |
parent | 036cc30c6b6af1cd42de6c34c4461f17da01cbf7 (diff) | |
download | op-kernel-dev-0f1ba9a2cea52896448ef4e14a4cb1880b8e5bee.zip op-kernel-dev-0f1ba9a2cea52896448ef4e14a4cb1880b8e5bee.tar.gz |
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: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Link: http://lkml.kernel.org/r/20150107090441.GC4365@osiris
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'Documentation/locking')
0 files changed, 0 insertions, 0 deletions