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authorAndrey Konovalov <andreyknvl@google.com>2023-02-11 00:16:00 +0300
committerAndrew Morton <akpm@linux-foundation.org>2023-02-17 07:43:51 +0300
commit514d5c557b8b590a80f0569af5ae5f4d455ecef2 (patch)
treea4813263ac0742521e54e22d1520966a75317fff /lib
parentcb788e84a4cfe47941cded45b5ca81a917fbb1a6 (diff)
downloadlinux-514d5c557b8b590a80f0569af5ae5f4d455ecef2.tar.xz
lib/stacktrace: drop impossible WARN_ON for depot_init_pool
depot_init_pool has two call sites: 1. In depot_alloc_stack with a potentially NULL prealloc. 2. In __stack_depot_save with a non-NULL prealloc. At the same time depot_init_pool can only return false when prealloc is NULL. As the second call site makes sure that prealloc is not NULL, the WARN_ON there can never trigger. Thus, drop the WARN_ON and also move the prealloc check from depot_init_pool to its first call site. Also change the return type of depot_init_pool to void as it now always returns true. Link: https://lkml.kernel.org/r/ce149f9bdcbc80a92549b54da67eafb27f846b7b.1676063693.git.andreyknvl@google.com Signed-off-by: Andrey Konovalov <andreyknvl@google.com> Reviewed-by: Alexander Potapenko <glider@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'lib')
-rw-r--r--lib/stackdepot.c12
1 files changed, 5 insertions, 7 deletions
diff --git a/lib/stackdepot.c b/lib/stackdepot.c
index 7f5f08bb6c3a..d4d988276b91 100644
--- a/lib/stackdepot.c
+++ b/lib/stackdepot.c
@@ -218,16 +218,14 @@ out_unlock:
}
EXPORT_SYMBOL_GPL(stack_depot_init);
-static bool depot_init_pool(void **prealloc)
+static void depot_init_pool(void **prealloc)
{
- if (!*prealloc)
- return false;
/*
* This smp_load_acquire() pairs with smp_store_release() to
* |next_pool_inited| below and in depot_alloc_stack().
*/
if (smp_load_acquire(&next_pool_inited))
- return true;
+ return;
if (stack_pools[pool_index] == NULL) {
stack_pools[pool_index] = *prealloc;
*prealloc = NULL;
@@ -243,7 +241,6 @@ static bool depot_init_pool(void **prealloc)
*/
smp_store_release(&next_pool_inited, 1);
}
- return true;
}
/* Allocation of a new stack in raw storage */
@@ -270,7 +267,8 @@ depot_alloc_stack(unsigned long *entries, int size, u32 hash, void **prealloc)
if (pool_index + 1 < DEPOT_MAX_POOLS)
smp_store_release(&next_pool_inited, 0);
}
- depot_init_pool(prealloc);
+ if (*prealloc)
+ depot_init_pool(prealloc);
if (stack_pools[pool_index] == NULL)
return NULL;
@@ -435,7 +433,7 @@ depot_stack_handle_t __stack_depot_save(unsigned long *entries,
* We didn't need to store this stack trace, but let's keep
* the preallocated memory for the future.
*/
- WARN_ON(!depot_init_pool(&prealloc));
+ depot_init_pool(&prealloc);
}
raw_spin_unlock_irqrestore(&pool_lock, flags);