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powerpc/irq: Don't WARN continuously in arch_local_irq_restore() 

When CONFIG_PPC_IRQ_SOFT_MASK_DEBUG is enabled (uncommon), we have a
series of WARN_ON's in arch_local_irq_restore().

These are "should never happen" conditions, but if they do happen they
can flood the console and render the system unusable. So switch them
to WARN_ON_ONCE().

Fixes: e2b36d5917 ("powerpc/64: Don't trace code that runs with the soft irq mask unreconciled")
Fixes: 9b81c0211c ("powerpc/64s: make PACA_IRQ_HARD_DIS track MSR[EE] closely")
Fixes: 7c0482e3d0 ("powerpc/irq: Fix another case of lazy IRQ state getting out of sync")
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20190708061046.7075-1-mpe@ellerman.id.au
This commit is contained in:
Michael Ellerman 2019-07-08 16:02:19 +10:00
parent a2b6f26c26
commit 0fc12c022a
1 changed files with 3 additions and 3 deletions
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6
arch/powerpc/kernel/irq.c
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@ -259,7 +259,7 @@ notrace void arch_local_irq_restore(unsigned long mask)
irq_happened = get_irq_happened();
if (!irq_happened) {
#ifdef CONFIG_PPC_IRQ_SOFT_MASK_DEBUG
WARN_ON(!(mfmsr() & MSR_EE));
WARN_ON_ONCE(!(mfmsr() & MSR_EE));
#endif
return;
}
@ -272,7 +272,7 @@ notrace void arch_local_irq_restore(unsigned long mask)
*/
if (!(irq_happened & PACA_IRQ_HARD_DIS)) {
#ifdef CONFIG_PPC_IRQ_SOFT_MASK_DEBUG
WARN_ON(!(mfmsr() & MSR_EE));
WARN_ON_ONCE(!(mfmsr() & MSR_EE));
#endif
__hard_irq_disable();
#ifdef CONFIG_PPC_IRQ_SOFT_MASK_DEBUG
@ -283,7 +283,7 @@ notrace void arch_local_irq_restore(unsigned long mask)
* warn if we are wrong. Only do that when IRQ tracing
* is enabled as mfmsr() can be costly.
*/
if (WARN_ON(mfmsr() & MSR_EE))
if (WARN_ON_ONCE(mfmsr() & MSR_EE))
__hard_irq_disable();
#endif
}