linux-kernel - [PATCH v3 3/3] kasan: use stack_trace_save

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Date:   Wed, 13 Apr 2022 21:26:46 +0200
From:   andrey.konovalov@...ux.dev
To:     Marco Elver <elver@...gle.com>,
        Alexander Potapenko <glider@...gle.com>,
        Mark Rutland <mark.rutland@....com>
Cc:     Andrey Konovalov <andreyknvl@...il.com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Andrey Ryabinin <ryabinin.a.a@...il.com>,
        kasan-dev@...glegroups.com,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        Vincenzo Frascino <vincenzo.frascino@....com>,
        Sami Tolvanen <samitolvanen@...gle.com>,
        linux-arm-kernel@...ts.infradead.org,
        Peter Collingbourne <pcc@...gle.com>,
        Evgenii Stepanov <eugenis@...gle.com>,
        Florian Mayer <fmayer@...gle.com>,
        Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org,
        Andrey Konovalov <andreyknvl@...gle.com>
Subject: [PATCH v3 3/3] kasan: use stack_trace_save_shadow

From: Andrey Konovalov <andreyknvl@...gle.com>

Use stack_trace_save_shadow() to collect stack traces 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@...gle.com>
---
 mm/kasan/common.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/mm/kasan/common.c b/mm/kasan/common.c
index 23b30fa6e270..00fef2e5fe90 100644
--- a/mm/kasan/common.c
+++ b/mm/kasan/common.c
@@ -97,7 +97,9 @@ depot_stack_handle_t kasan_save_stack(gfp_t flags, bool can_alloc)
 	unsigned long entries[KASAN_STACK_DEPTH];
 	unsigned int nr_entries;
 
-	nr_entries = stack_trace_save(entries, ARRAY_SIZE(entries), 0);
+	nr_entries = stack_trace_save_shadow(entries, ARRAY_SIZE(entries));
+	if (nr_entries < 0)
+		nr_entries = stack_trace_save(entries, ARRAY_SIZE(entries), 0);
 	return __stack_depot_save(entries, nr_entries, flags, can_alloc);
 }
 
-- 
2.25.1