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authorThomas Gleixner <tglx@linutronix.de>2019-04-10 12:28:05 +0200
committerThomas Gleixner <tglx@linutronix.de>2019-04-14 19:58:30 +0200
commitb8ca7ff7731f57b256fcc13a9b7d4913f5282e5c (patch)
tree23b094313cb6d6d36b62990cc7c45033dd41a469 /mm/slub.c
parent2dfed4565afe263751d2451ad22336ad806c25a6 (diff)
downloadlinux-b8ca7ff7731f57b256fcc13a9b7d4913f5282e5c.tar.bz2
mm/slub: Remove the ULONG_MAX stack trace hackery
No architecture terminates the stack trace with ULONG_MAX anymore. Remove the cruft. While at it remove the pointless loop of clearing the stack array completely. It's sufficient to clear the last entry as the consumers break out on the first zeroed entry anyway. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: Josh Poimboeuf <jpoimboe@redhat.com> Cc: Andy Lutomirski <luto@kernel.org> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Alexander Potapenko <glider@google.com> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Pekka Enberg <penberg@kernel.org> Cc: linux-mm@kvack.org Cc: David Rientjes <rientjes@google.com> Cc: Christoph Lameter <cl@linux.com> Link: https://lkml.kernel.org/r/20190410103644.574058244@linutronix.de
Diffstat (limited to 'mm/slub.c')
-rw-r--r--mm/slub.c13
1 files changed, 4 insertions, 9 deletions
diff --git a/mm/slub.c b/mm/slub.c
index d30ede89f4a6..e2ccd12b6faa 100644
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -553,7 +553,6 @@ static void set_track(struct kmem_cache *s, void *object,
if (addr) {
#ifdef CONFIG_STACKTRACE
struct stack_trace trace;
- int i;
trace.nr_entries = 0;
trace.max_entries = TRACK_ADDRS_COUNT;
@@ -563,20 +562,16 @@ static void set_track(struct kmem_cache *s, void *object,
save_stack_trace(&trace);
metadata_access_disable();
- /* See rant in lockdep.c */
- if (trace.nr_entries != 0 &&
- trace.entries[trace.nr_entries - 1] == ULONG_MAX)
- trace.nr_entries--;
-
- for (i = trace.nr_entries; i < TRACK_ADDRS_COUNT; i++)
- p->addrs[i] = 0;
+ if (trace.nr_entries < TRACK_ADDRS_COUNT)
+ p->addrs[trace.nr_entries] = 0;
#endif
p->addr = addr;
p->cpu = smp_processor_id();
p->pid = current->pid;
p->when = jiffies;
- } else
+ } else {
memset(p, 0, sizeof(struct track));
+ }
}
static void init_tracking(struct kmem_cache *s, void *object)