[PATCH -mm] slub: STACKDEPOT: rename save_stack_trace()

[Randy Dunlap <rdunlap@infradead.org>]

save_stack_trace() already exists, so change the one in
CONFIG_STACKDEPOT to be save_stack_depot_trace().

Fixes this build error:

../mm/slub.c:607:29: error: conflicting types for ‘save_stack_trace’
 static depot_stack_handle_t save_stack_trace(gfp_t flags)
                             ^~~~~~~~~~~~~~~~
In file included from ../include/linux/page_ext.h:6:0,
                 from ../include/linux/mm.h:25,
                 from ../mm/slub.c:13:
../include/linux/stacktrace.h:86:13: note: previous declaration of ‘save_stack_trace’ was here
 extern void save_stack_trace(struct stack_trace *trace);
             ^~~~~~~~~~~~~~~~

from this patch in mmotm:
  Subject: mm/slub: use stackdepot to save stack trace in objects


Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Cc: Oliver Glitta <glittao@gmail.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: linux-mm@kvack.org
---
 mm/slub.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- mmotm-2021-0512-2146.orig/mm/slub.c
+++ mmotm-2021-0512-2146/mm/slub.c
@@ -604,7 +604,7 @@ static struct track *get_track(struct km
 }
 
 #ifdef CONFIG_STACKDEPOT
-static depot_stack_handle_t save_stack_trace(gfp_t flags)
+static depot_stack_handle_t save_stack_depot_trace(gfp_t flags)
 {
 	unsigned long entries[TRACK_ADDRS_COUNT];
 	depot_stack_handle_t handle;
@@ -623,7 +623,7 @@ static void set_track(struct kmem_cache
 
 	if (addr) {
 #ifdef CONFIG_STACKDEPOT
-		p->handle = save_stack_trace(GFP_KERNEL);
+		p->handle = save_stack_depot_trace(GFP_KERNEL);
 #endif
 		p->addr = addr;
 		p->cpu = smp_processor_id();