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From:   andrey.konovalov@linux.dev
To:     Andrew Morton <akpm@linux-foundation.org>
Cc:     Andrey Konovalov <andreyknvl@gmail.com>,
        Marco Elver <elver@google.com>,
        Alexander Potapenko <glider@google.com>,
        Dmitry Vyukov <dvyukov@google.com>,
        Vlastimil Babka <vbabka@suse.cz>, kasan-dev@googlegroups.com,
        Evgenii Stepanov <eugenis@google.com>,
        Oscar Salvador <osalvador@suse.de>, linux-mm@kvack.org,
        linux-kernel@vger.kernel.org,
        Andrey Konovalov <andreyknvl@google.com>
Subject: [PATCH v4 02/22] lib/stackdepot: check disabled flag when fetching
Date:   Mon, 20 Nov 2023 18:47:00 +0100
Message-Id: <c3bfa3b7ab00b2e48ab75a3fbb9c67555777cb08.1700502145.git.andreyknvl@google.com>
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From: Andrey Konovalov <andreyknvl@google.com>

Do not try fetching a stack trace from the stack depot if the
stack_depot_disabled flag is enabled.

Reviewed-by: Alexander Potapenko <glider@google.com>
Signed-off-by: Andrey Konovalov <andreyknvl@google.com>
---
 lib/stackdepot.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/stackdepot.c b/lib/stackdepot.c
index 0eeaef4f2523..f8a8033e1dc8 100644
--- a/lib/stackdepot.c
+++ b/lib/stackdepot.c
@@ -483,7 +483,7 @@ unsigned int stack_depot_fetch(depot_stack_handle_t handle,
 	 */
 	kmsan_unpoison_memory(entries, sizeof(*entries));
 
-	if (!handle)
+	if (!handle || stack_depot_disabled)
 		return 0;
 
 	if (parts.pool_index > pool_index_cached) {
-- 
2.25.1