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Tue, 12 Aug 2025 12:50:14 +0000 (UTC) Received: from MiWiFi-R3L-srv.redhat.com (unknown [10.72.112.156]) by mx-prod-int-01.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTP id 173963001458; Tue, 12 Aug 2025 12:50:07 +0000 (UTC) From: Baoquan He To: linux-mm@kvack.org Cc: ryabinin.a.a@gmail.com, glider@google.com, andreyknvl@gmail.com, dvyukov@google.com, vincenzo.frascino@arm.com, akpm@linux-foundation.org, kasan-dev@googlegroups.com, linux-kernel@vger.kernel.org, kexec@lists.infradead.org, sj@kernel.org, lorenzo.stoakes@oracle.com, elver@google.com, snovitoll@gmail.com, Baoquan He Subject: [PATCH v2 03/12] mm/kasan/sw_tags: don't initialize kasan if it's disabled Date: Tue, 12 Aug 2025 20:49:32 +0800 Message-ID: <20250812124941.69508-4-bhe@redhat.com> In-Reply-To: <20250812124941.69508-1-bhe@redhat.com> References: <20250812124941.69508-1-bhe@redhat.com> MIME-Version: 1.0 Content-type: text/plain Content-Transfer-Encoding: 8bit X-Scanned-By: MIMEDefang 3.4.1 on 10.30.177.4 X-Rspamd-Server: rspam03 X-Rspam-User: X-Rspamd-Queue-Id: 3D4F5A000C X-Stat-Signature: ws9qeghm7f6uy6779bs384hwd1t5nj94 X-HE-Tag: 1755003022-538955 X-HE-Meta: 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 7cWd5gh+ Zv8W2U3OJ1a7aaoDYOBspeZGtPZiBucbm9/WVechdDzwvEJaUs+jhuTEa81Sw/1Ridw/6YktoQtH9cn8molOfKpOd2rUMgDGkqyqMB8UhXu6PLqnZX8s2ID2byyGnzcwirc20oir521g7b2jEG+Ejic2eqIRosgeemMDREPOQtFhFxQ8MU8sLHPwFS087T+yvRIb91JPbegv+DSvOKHb+VvxCi/8iBxyEmgD4eQopjY1PAeuJbZkgJbbFgjjPGC1zzVGhPpyqlgFtiQM3gjlTipmwgtgUS1qUmgJAVJTat7XPyHZed9M/IKeoqqhQVLPamqNo5X2lT6cEZSwZg7v+8zQY5dD4+fogelCYjn23j00OHSZmwIrUlsGPN8VDujfb0nRYUCsKcpzT3WhivfMAG70M5mPsnbtMmDxDZSbmoG7K/P/s1i5lM4MltXWIn3CAub9pbRTHKbL1/lg= X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: And also add code to enable kasan_flag_enabled, this is for later usage. Signed-off-by: Baoquan He --- mm/kasan/sw_tags.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/mm/kasan/sw_tags.c b/mm/kasan/sw_tags.c index 01f19bc4a326..dd963ba4d143 100644 --- a/mm/kasan/sw_tags.c +++ b/mm/kasan/sw_tags.c @@ -40,11 +40,17 @@ void __init kasan_init_sw_tags(void) { int cpu; + if (kasan_arg_disabled) + return; + for_each_possible_cpu(cpu) per_cpu(prng_state, cpu) = (u32)get_cycles(); kasan_init_tags(); + /* KASAN is now initialized, enable it. */ + static_branch_enable(&kasan_flag_enabled); + pr_info("KernelAddressSanitizer initialized (sw-tags, stacktrace=%s)\n", str_on_off(kasan_stack_collection_enabled())); } -- 2.41.0