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A single fix for the generic entry code to correct the wrong assumption

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that the lockdep interrupt state needs not to be established before calling
 the RCU check.
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Merge tag 'core-urgent-2020-11-08' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull entry code fix from Thomas Gleixner:
 "A single fix for the generic entry code to correct the wrong
  assumption that the lockdep interrupt state needs not to be
  established before calling the RCU check"

* tag 'core-urgent-2020-11-08' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  entry: Fix the incorrect ordering of lockdep and RCU check
This commit is contained in:
Linus Torvalds 2020-11-08 09:51:28 -08:00
commit 6a8d0d283d
1 changed files with 2 additions and 2 deletions
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4
kernel/entry/common.c
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@ -337,10 +337,10 @@ noinstr irqentry_state_t irqentry_enter(struct pt_regs *regs)
* already contains a warning when RCU is not watching, so no point
* in having another one here.
*/
lockdep_hardirqs_off(CALLER_ADDR0);
instrumentation_begin();
rcu_irq_enter_check_tick();
/* Use the combo lockdep/tracing function */
trace_hardirqs_off();
trace_hardirqs_off_finish();
instrumentation_end();
return ret;