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authorPeter Zijlstra <peterz@infradead.org>2020-10-22 13:23:02 +0300
committerPeter Zijlstra <peterz@infradead.org>2020-10-22 13:37:22 +0300
commitf8e48a3dca060e80f672d398d181db1298fbc86c (patch)
tree8ccab9b05381c1cd06d368bedf620bcd8bb3ae7b /kernel/locking
parented3e453798d4f81c99056aa09fcd79d0874a60fd (diff)
downloadlinux-f8e48a3dca060e80f672d398d181db1298fbc86c.tar.xz
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.c4
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()) {