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authorImran Khan <imran.f.khan@oracle.com>2021-11-08 18:33:12 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2021-11-09 10:02:50 -0800
commit505be48165fa2f2cb795659b4fc61f35563d105e (patch)
treeabbf6f9a5e145d142a96f154fa16e192eab17a9b
parent4d4712c1a4ac331574fb4542e4adcfd24fdb07d0 (diff)
lib, stackdepot: add helper to print stack entries
To print a stack entries, users of stackdepot, first use stack_depot_fetch to get a list of stack entries and then use stack_trace_print to print this list. Provide a helper in stackdepot to print stack entries based on stackdepot handle. Also change above mentioned users to use this helper. Link: https://lkml.kernel.org/r/20210915014806.3206938-3-imran.f.khan@oracle.com Signed-off-by: Imran Khan <imran.f.khan@oracle.com> Suggested-by: Vlastimil Babka <vbabka@suse.cz> Acked-by: Vlastimil Babka <vbabka@suse.cz> Reviewed-by: Alexander Potapenko <glider@google.com> Cc: Andrey Konovalov <andreyknvl@gmail.com> Cc: Andrey Ryabinin <ryabinin.a.a@gmail.com> Cc: Daniel Vetter <daniel@ffwll.ch> Cc: David Airlie <airlied@linux.ie> Cc: Dmitry Vyukov <dvyukov@google.com> Cc: Geert Uytterhoeven <geert@linux-m68k.org> Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com> Cc: Maxime Ripard <mripard@kernel.org> Cc: Thomas Zimmermann <tzimmermann@suse.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--include/linux/stackdepot.h2
-rw-r--r--lib/stackdepot.c18
-rw-r--r--mm/kasan/report.c15
-rw-r--r--mm/page_owner.c13
4 files changed, 27 insertions, 21 deletions
diff --git a/include/linux/stackdepot.h b/include/linux/stackdepot.h
index d29860966bc9..8ab37500fcba 100644
--- a/include/linux/stackdepot.h
+++ b/include/linux/stackdepot.h
@@ -25,6 +25,8 @@ depot_stack_handle_t stack_depot_save(unsigned long *entries,
unsigned int stack_depot_fetch(depot_stack_handle_t handle,
unsigned long **entries);
+void stack_depot_print(depot_stack_handle_t stack);
+
#ifdef CONFIG_STACKDEPOT
int stack_depot_init(void);
#else
diff --git a/lib/stackdepot.c b/lib/stackdepot.c
index f034f095c627..4e1f2982d0fa 100644
--- a/lib/stackdepot.c
+++ b/lib/stackdepot.c
@@ -214,6 +214,24 @@ static inline struct stack_record *find_stack(struct stack_record *bucket,
}
/**
+ * stack_depot_print - print stack entries from a depot
+ *
+ * @stack: Stack depot handle which was returned from
+ * stack_depot_save().
+ *
+ */
+void stack_depot_print(depot_stack_handle_t stack)
+{
+ unsigned long *entries;
+ unsigned int nr_entries;
+
+ nr_entries = stack_depot_fetch(stack, &entries);
+ if (nr_entries > 0)
+ stack_trace_print(entries, nr_entries, 0);
+}
+EXPORT_SYMBOL_GPL(stack_depot_print);
+
+/**
* stack_depot_fetch - Fetch stack entries from a depot
*
* @handle: Stack depot handle which was returned from
diff --git a/mm/kasan/report.c b/mm/kasan/report.c
index 884a950c7026..3239fd8f8747 100644
--- a/mm/kasan/report.c
+++ b/mm/kasan/report.c
@@ -132,20 +132,11 @@ static void end_report(unsigned long *flags, unsigned long addr)
kasan_enable_current();
}
-static void print_stack(depot_stack_handle_t stack)
-{
- unsigned long *entries;
- unsigned int nr_entries;
-
- nr_entries = stack_depot_fetch(stack, &entries);
- stack_trace_print(entries, nr_entries, 0);
-}
-
static void print_track(struct kasan_track *track, const char *prefix)
{
pr_err("%s by task %u:\n", prefix, track->pid);
if (track->stack) {
- print_stack(track->stack);
+ stack_depot_print(track->stack);
} else {
pr_err("(stack is not available)\n");
}
@@ -214,12 +205,12 @@ static void describe_object_stacks(struct kmem_cache *cache, void *object,
return;
if (alloc_meta->aux_stack[0]) {
pr_err("Last potentially related work creation:\n");
- print_stack(alloc_meta->aux_stack[0]);
+ stack_depot_print(alloc_meta->aux_stack[0]);
pr_err("\n");
}
if (alloc_meta->aux_stack[1]) {
pr_err("Second to last potentially related work creation:\n");
- print_stack(alloc_meta->aux_stack[1]);
+ stack_depot_print(alloc_meta->aux_stack[1]);
pr_err("\n");
}
#endif
diff --git a/mm/page_owner.c b/mm/page_owner.c
index 62402d22539b..eff29be1218b 100644
--- a/mm/page_owner.c
+++ b/mm/page_owner.c
@@ -394,8 +394,6 @@ void __dump_page_owner(const struct page *page)
struct page_ext *page_ext = lookup_page_ext(page);
struct page_owner *page_owner;
depot_stack_handle_t handle;
- unsigned long *entries;
- unsigned int nr_entries;
gfp_t gfp_mask;
int mt;
@@ -423,20 +421,17 @@ void __dump_page_owner(const struct page *page)
page_owner->pid, page_owner->ts_nsec, page_owner->free_ts_nsec);
handle = READ_ONCE(page_owner->handle);
- if (!handle) {
+ if (!handle)
pr_alert("page_owner allocation stack trace missing\n");
- } else {
- nr_entries = stack_depot_fetch(handle, &entries);
- stack_trace_print(entries, nr_entries, 0);
- }
+ else
+ stack_depot_print(handle);
handle = READ_ONCE(page_owner->free_handle);
if (!handle) {
pr_alert("page_owner free stack trace missing\n");
} else {
- nr_entries = stack_depot_fetch(handle, &entries);
pr_alert("page last free stack trace:\n");
- stack_trace_print(entries, nr_entries, 0);
+ stack_depot_print(handle);
}
if (page_owner->last_migrate_reason != -1)