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| author |   Peter Zijlstra <peterz@infradead.org> | 2020-10-22 12:23:02 +0200 |
|---|---|---|
| committer | Peter Zijlstra <peterz@infradead.org> | 2020-10-22 12:37:22 +0200 |
| commit | f8e48a3dca060e80f672d398d181db1298fbc86c (patch) | |
| tree | 8ccab9b05381c1cd06d368bedf620bcd8bb3ae7b /kernel/locking | |
| parent | locking/seqlocks: Fix kernel-doc warnings (diff) | |
| download | linux-dev-f8e48a3dca060e80f672d398d181db1298fbc86c.tar.xz linux-dev-f8e48a3dca060e80f672d398d181db1298fbc86c.zip | |
lockdep: Fix preemption WARN for spurious IRQ-enable
It is valid (albeit uncommon) to call local_irq_enable() without first
having called local_irq_disable(). In this case we enter
lockdep_hardirqs_on*() with IRQs enabled and trip a preemption warning
for using __this_cpu_read().
Use this_cpu_read() instead to avoid the warning.
Fixes: 4d004099a6 ("lockdep: Fix lockdep recursion")
Reported-by: syzbot+53f8ce8bbc07924b6417@syzkaller.appspotmail.com
Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Diffstat (limited to 'kernel/locking')
| -rw-r--r-- | kernel/locking/lockdep.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/kernel/locking/lockdep.c b/kernel/locking/lockdep.c index 3e99dfef8408..fc206aefa970 100644 --- a/kernel/locking/lockdep.c +++ b/kernel/locking/lockdep.c @@ -4057,7 +4057,7 @@ void lockdep_hardirqs_on_prepare(unsigned long ip) if (unlikely(in_nmi())) return; - if (unlikely(__this_cpu_read(lockdep_recursion))) + if (unlikely(this_cpu_read(lockdep_recursion))) return; if (unlikely(lockdep_hardirqs_enabled())) { @@ -4126,7 +4126,7 @@ void noinstr lockdep_hardirqs_on(unsigned long ip) goto skip_checks; } - if (unlikely(__this_cpu_read(lockdep_recursion))) + if (unlikely(this_cpu_read(lockdep_recursion))) return; if (lockdep_hardirqs_enabled()) { |