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mm/debug: Provide VM_WARN_ON_IRQS_ENABLED()

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Some places in the VM code expect interrupts disabled, which is a valid
expectation on non-PREEMPT_RT kernels, but does not hold on RT kernels in
some places because the RT spinlock substitution does not disable
interrupts.

To avoid sprinkling CONFIG_PREEMPT_RT conditionals into those places,
provide VM_WARN_ON_IRQS_ENABLED() which is only enabled when VM_DEBUG=y and
PREEMPT_RT=n.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: Michal Hocko <mhocko@suse.com>
Link: https://lore.kernel.org/r/20220825164131.402717-5-bigeasy@linutronix.de
This commit is contained in:
Thomas Gleixner
2022-08-25 18:41:27 +02:00
parent 7a025e91ab
commit a738e9bad6
2 changed files with 9 additions and 0 deletions
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6
include/linux/mmdebug.h
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@@ -94,6 +94,12 @@ void dump_mm(const struct mm_struct *mm);
#define VM_WARN(cond, format...) BUILD_BUG_ON_INVALID(cond)
#endif
#ifdef CONFIG_DEBUG_VM_IRQSOFF
#define VM_WARN_ON_IRQS_ENABLED() WARN_ON_ONCE(!irqs_disabled())
#else
#define VM_WARN_ON_IRQS_ENABLED() do { } while (0)
#endif
#ifdef CONFIG_DEBUG_VIRTUAL
#define VIRTUAL_BUG_ON(cond) BUG_ON(cond)
#else