[patch V3 07/29] mm/slub: Simplify stack trace retrieval

[Thomas Gleixner]

Replace the indirection through struct stack_trace with an invocation of
the storage array based interface.

Signed-off-by: Thomas Gleixner <tglx at linutronix.de>
Acked-by: Christoph Lameter <cl at linux.com>
Cc: Andrew Morton <akpm at linux-foundation.org>
Cc: Pekka Enberg <penberg at kernel.org>
Cc: linux-mm at kvack.org
Cc: David Rientjes <rientjes at google.com>
---
 mm/slub.c |   12 ++++--------
 1 file changed, 4 insertions(+), 8 deletions(-)

--- a/mm/slub.c
+++ b/mm/slub.c
@@ -552,18 +552,14 @@ static void set_track(struct kmem_cache
 
 	if (addr) {
 #ifdef CONFIG_STACKTRACE
-		struct stack_trace trace;
+		unsigned int nr_entries;
 
-		trace.nr_entries = 0;
-		trace.max_entries = TRACK_ADDRS_COUNT;
-		trace.entries = p->addrs;
-		trace.skip = 3;
 		metadata_access_enable();
-		save_stack_trace(&trace);
+		nr_entries = stack_trace_save(p->addrs, TRACK_ADDRS_COUNT, 3);
 		metadata_access_disable();
 
-		if (trace.nr_entries < TRACK_ADDRS_COUNT)
-			p->addrs[trace.nr_entries] = 0;
+		if (nr_entries < TRACK_ADDRS_COUNT)
+			p->addrs[nr_entries] = 0;
 #endif
 		p->addr = addr;
 		p->cpu = smp_processor_id();