[PATCH v2 4/4] kasan: use stack_trace_save_shadow

andrey.konovalov
2022-03-23T15:33:10Z

From: Andrey Konovalov <andreyknvl@google.com>

Now that stack_trace_save_shadow() is implemented by arm64, use it
whenever CONFIG_HAVE_SHADOW_STACKTRACE is enabled. This improves the
boot time of a defconfig build by ~30% for all KASAN modes.

Signed-off-by: Andrey Konovalov <andreyknvl@google.com>
---
mm/kasan/common.c | 9 ++++++---
1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/mm/kasan/common.c b/mm/kasan/common.c
index d9079ec11f31..8d9d35c6562b 100644
--- a/mm/kasan/common.c
+++ b/mm/kasan/common.c
@@ -33,10 +33,13 @@
depot_stack_handle_t kasan_save_stack(gfp_t flags, bool can_alloc)
{
unsigned long entries[KASAN_STACK_DEPTH];
- unsigned int nr_entries;
+ unsigned int size;

- nr_entries = stack_trace_save(entries, ARRAY_SIZE(entries), 0);
- return __stack_depot_save(entries, nr_entries, flags, can_alloc);
+ if (IS_ENABLED(CONFIG_HAVE_SHADOW_STACKTRACE))
+ size = stack_trace_save_shadow(entries, ARRAY_SIZE(entries), 0);
+ else
+ size = stack_trace_save(entries, ARRAY_SIZE(entries), 0);
+ return __stack_depot_save(entries, size, flags, can_alloc);
}

void kasan_set_track(struct kasan_track *track, gfp_t flags)
--
2.25.1