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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>
This commit is contained in:
Imran Khan 2021-11-08 18:33:12 -08:00 committed by Linus Torvalds
parent 4d4712c1a4
commit 505be48165
4 changed files with 27 additions and 21 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
include/linux/stackdepot.h
View File

@ -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

18
lib/stackdepot.c
View File

@ -213,6 +213,24 @@ static inline struct stack_record *find_stack(struct stack_record *bucket,
return NULL;
}
/**
* 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
*

15
mm/kasan/report.c
View File

@ -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

13
mm/page_owner.c
View File

@ -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)