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| author | Thomas Gleixner <tglx@linutronix.de> | 2022-08-25 19:41:27 +0300 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2022-09-19 15:35:08 +0300 |
| commit | a738e9bad6030d4fd33bfd7db3399a250b7e94d8 (patch) | |
| tree | 35ae639c7c133b6722252ceacf28d7e5802698d9 | |
| parent | 7a025e91abd23effe869a05d037b26770ffa0309 (diff) | |
| download | linux-a738e9bad6030d4fd33bfd7db3399a250b7e94d8.tar.xz | |
mm/debug: Provide VM_WARN_ON_IRQS_ENABLED()
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
| -rw-r--r-- | include/linux/mmdebug.h | 6 | ||||
| -rw-r--r-- | lib/Kconfig.debug | 3 |
2 files changed, 9 insertions, 0 deletions
diff --git a/include/linux/mmdebug.h b/include/linux/mmdebug.h index 15ae78cd2853..b8728d11c949 100644 --- a/include/linux/mmdebug.h +++ b/include/linux/mmdebug.h @@ -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 diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug index bcbe60d6c80c..cdb4b27ef1a0 100644 --- a/lib/Kconfig.debug +++ b/lib/Kconfig.debug @@ -803,6 +803,9 @@ config ARCH_HAS_DEBUG_VM_PGTABLE An architecture should select this when it can successfully build and run DEBUG_VM_PGTABLE. +config DEBUG_VM_IRQSOFF + def_bool DEBUG_VM && !PREEMPT_RT + config DEBUG_VM bool "Debug VM" depends on DEBUG_KERNEL |