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closures: fix closure_sync + closure debugging

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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 <kent.overstreet@linux.dev>
This commit is contained in:
Kent Overstreet 2024-06-29 22:12:09 -04:00
parent 0435773239
commit 29f1c1ae6d
2 changed files with 10 additions and 0 deletions
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7
include/linux/closure.h
View File

@ -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
}
/**

3
lib/closure.c
View File

@ -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;