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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
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