From 29f1c1ae6d2fff3bf4f89d265f4a1a7c8ab78a8e Mon Sep 17 00:00:00 2001 From: Kent Overstreet Date: Sat, 29 Jun 2024 22:12:09 -0400 Subject: [PATCH] closures: fix closure_sync + closure debugging originally, stack closures were only used synchronously, and with the original implementation of closure_sync() the ref never hit 0; thus, closure_put_after_sub() assumes that if the ref hits 0 it's on the debug list, in debug mode. that's no longer true with the current implementation of closure_sync, so we need a new magic so closure_debug_destroy() doesn't pop an assert. Signed-off-by: Kent Overstreet --- include/linux/closure.h | 7 +++++++ lib/closure.c | 3 +++ 2 files changed, 10 insertions(+) diff --git a/include/linux/closure.h b/include/linux/closure.h index 59b8c06b11ff..2af44427107d 100644 --- a/include/linux/closure.h +++ b/include/linux/closure.h @@ -159,6 +159,7 @@ struct closure { #ifdef CONFIG_DEBUG_CLOSURES #define CLOSURE_MAGIC_DEAD 0xc054dead #define CLOSURE_MAGIC_ALIVE 0xc054a11e +#define CLOSURE_MAGIC_STACK 0xc05451cc unsigned int magic; struct list_head all; @@ -323,12 +324,18 @@ static inline void closure_init_stack(struct closure *cl) { memset(cl, 0, sizeof(struct closure)); atomic_set(&cl->remaining, CLOSURE_REMAINING_INITIALIZER); +#ifdef CONFIG_DEBUG_CLOSURES + cl->magic = CLOSURE_MAGIC_STACK; +#endif } static inline void closure_init_stack_release(struct closure *cl) { memset(cl, 0, sizeof(struct closure)); atomic_set_release(&cl->remaining, CLOSURE_REMAINING_INITIALIZER); +#ifdef CONFIG_DEBUG_CLOSURES + cl->magic = CLOSURE_MAGIC_STACK; +#endif } /** diff --git a/lib/closure.c b/lib/closure.c index c971216d9d77..116afae2eed9 100644 --- a/lib/closure.c +++ b/lib/closure.c @@ -244,6 +244,9 @@ void closure_debug_destroy(struct closure *cl) { unsigned long flags; + if (cl->magic == CLOSURE_MAGIC_STACK) + return; + BUG_ON(cl->magic != CLOSURE_MAGIC_ALIVE); cl->magic = CLOSURE_MAGIC_DEAD;