The patch titled
Subject: lib, stackdepot: add helper to print stack entries
has been added to the -mm tree. Its filename is
lib-stackdepot-add-helper-to-print-stack-entries.patch
This patch should soon appear at
https://ozlabs.org/~akpm/mmots/broken-out/lib-stackdepot-add-helper-to-print-stack-entries.patch
and later at
https://ozlabs.org/~akpm/mmotm/broken-out/lib-stackdepot-add-helper-to-print-stack-entries.patch
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*** Remember to use Documentation/process/submit-checklist.rst when testing your code ***
The -mm tree is included into linux-next and is updated
there every 3-4 working days
------------------------------------------------------
From: Imran Khan <imran.f.khan@xxxxxxxxxx>
Subject: 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@xxxxxxxxxx
Signed-off-by: Imran Khan <imran.f.khan@xxxxxxxxxx>
Suggested-by: Vlastimil Babka <vbabka@xxxxxxx>
Acked-by: Vlastimil Babka <vbabka@xxxxxxx>
Reviewed-by: Alexander Potapenko <glider@xxxxxxxxxx>
Cc: Andrey Konovalov <andreyknvl@xxxxxxxxx>
Cc: Andrey Ryabinin <ryabinin.a.a@xxxxxxxxx>
Cc: Daniel Vetter <daniel@xxxxxxxx>
Cc: David Airlie <airlied@xxxxxxxx>
Cc: Dmitry Vyukov <dvyukov@xxxxxxxxxx>
Cc: Geert Uytterhoeven <geert@xxxxxxxxxxxxxx>
Cc: Maarten Lankhorst <maarten.lankhorst@xxxxxxxxxxxxxxx>
Cc: Maxime Ripard <mripard@xxxxxxxxxx>
Cc: Thomas Zimmermann <tzimmermann@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/linux/stackdepot.h | 2 ++
lib/stackdepot.c | 18 ++++++++++++++++++
mm/kasan/report.c | 15 +++------------
mm/page_owner.c | 13 ++++---------
4 files changed, 27 insertions(+), 21 deletions(-)
--- a/include/linux/stackdepot.h~lib-stackdepot-add-helper-to-print-stack-entries
+++ a/include/linux/stackdepot.h
@@ -25,6 +25,8 @@ depot_stack_handle_t stack_depot_save(un
unsigned int stack_depot_fetch(depot_stack_handle_t handle,
unsigned long **entries);
+void stack_depot_print(depot_stack_handle_t stack);
+
unsigned int filter_irq_stacks(unsigned long *entries, unsigned int nr_entries);
#ifdef CONFIG_STACKDEPOT
--- a/lib/stackdepot.c~lib-stackdepot-add-helper-to-print-stack-entries
+++ a/lib/stackdepot.c
@@ -215,6 +215,24 @@ static inline struct stack_record *find_
}
/**
+ * 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
--- a/mm/kasan/report.c~lib-stackdepot-add-helper-to-print-stack-entries
+++ a/mm/kasan/report.c
@@ -132,20 +132,11 @@ static void end_report(unsigned long *fl
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(struc
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
--- a/mm/page_owner.c~lib-stackdepot-add-helper-to-print-stack-entries
+++ a/mm/page_owner.c
@@ -394,8 +394,6 @@ void __dump_page_owner(const struct 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_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)
_
Patches currently in -mm which might be from imran.f.khan@xxxxxxxxxx are
lib-stackdepot-check-stackdepot-handle-before-accessing-slabs.patch
lib-stackdepot-add-helper-to-print-stack-entries.patch
lib-stackdepot-add-helper-to-print-stack-entries-into-buffer.patch
