diff options
Diffstat (limited to 'patches/0005-mm-debug-Provide-VM_WARN_ON_IRQS_ENABLED.patch')
| -rw-r--r-- | patches/0005-mm-debug-Provide-VM_WARN_ON_IRQS_ENABLED.patch | 51 |
1 files changed, 51 insertions, 0 deletions
diff --git a/patches/0005-mm-debug-Provide-VM_WARN_ON_IRQS_ENABLED.patch b/patches/0005-mm-debug-Provide-VM_WARN_ON_IRQS_ENABLED.patch new file mode 100644 index 000000000000..62c58ef57f11 --- /dev/null +++ b/patches/0005-mm-debug-Provide-VM_WARN_ON_IRQS_ENABLED.patch @@ -0,0 +1,51 @@ +From: Thomas Gleixner <tglx@linutronix.de> +Date: Wed, 17 Aug 2022 18:26:59 +0200 +Subject: [PATCH 5/9] 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> +Cc: Andrew Morton <akpm@linux-foundation.org> +Cc: linux-mm@kvack.org +Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> +Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org> +Link: https://lore.kernel.org/r/20220817162703.728679-6-bigeasy@linutronix.de +--- + include/linux/mmdebug.h | 6 ++++++ + lib/Kconfig.debug | 3 +++ + 2 files changed, 9 insertions(+) + +--- 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 +--- 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 |