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Wed, 25 Feb 2026 08:16:52 +0000 (UTC) Received: from MiWiFi-R3L-srv.redhat.com (unknown [10.72.112.55]) by mx-prod-int-08.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTP id A81041800351; Wed, 25 Feb 2026 08:16:42 +0000 (UTC) From: Baoquan He To: kasan-dev@googlegroups.com Cc: linux-mm@kvack.org, andreyknvl@gmail.com, ryabinin.a.a@gmail.com, glider@google.com, dvyukov@google.com, linux-kernel@vger.kernel.org, linux-um@lists.infradead.org, linux-arm-kernel@lists.infradead.org, loongarch@lists.linux.dev, linuxppc-dev@lists.ozlabs.org, linux-riscv@lists.infradead.org, x86@kernel.org, chris@zankel.net, jcmvbkbc@gmail.com, linux-s390@vger.kernel.org, hca@linux.ibm.com, Baoquan He Subject: [PATCH v5 13/15] arch/um: don't initialize kasan if it's disabled Date: Wed, 25 Feb 2026 16:14:10 +0800 Message-ID: <20260225081412.76502-14-bhe@redhat.com> In-Reply-To: <20260225081412.76502-1-bhe@redhat.com> References: <20260225081412.76502-1-bhe@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.4.1 on 10.30.177.111 X-Mimecast-MFC-PROC-ID: m4rEfFcuf9cJrEdq-IxuPbJSoTzjj5xwJ_oZlXjFYkE_1772007412 X-Mimecast-Originator: redhat.com Content-type: text/plain Content-Transfer-Encoding: 8bit X-Rspamd-Queue-Id: 406A7A000E X-Stat-Signature: mffahgtmnj58ha5166bd1wt77igzmjeb X-Rspam-User: X-Rspamd-Server: rspam12 X-HE-Tag: 1772007419-303049 X-HE-Meta: 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 4wNV3TOQ PbxPCBmQow5E7+6f5WL7yEg7pB6x7bBbgtXMq0gqCdhRDeJ1YHICKy+rDzn8Lb4VA9vcyX3L+qTIgcm+R76OOU31Xlun3GG60iLGzRdJEb7+QD/g4ukmGpBueVQfADGGoBOvZ6ckOjk/Ul3AGt8fKkTAOTwKyH/y17l2pu8yczh5+YRmPldX8fVQI/lqvrVOhNUAxHR+WZcYBDzVYSmLM8JVsBH5U6pVh+DKt/SCSVXTbWHZ7mpS1dSMrHFVXp92RfyDOcD9TsQXUSj6UI8eq7NMYvnogz7UzeVP5t/CufZ2XMo6P7q0uRLJnUHzRt4pdW0qTvk76qT5etGuRgpEynFOXn1730tX6gIHdzq7DXKw11jgjAEqz8dabyAOTbnIw/2jeIomN4Q1Dydof8EQ5GYwAX8X3uVBmWQmLEUOb7LYwwkJcTeFOnpropBfwbHMkePayViNAcC87hG0= Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: Here, kasan is disabled if specified 'kasan=off' in kernel cmdline. And also wrap up the kasan code into CONFIG_KASAN ifdeffery scope. Signed-off-by: Baoquan He Cc: linux-um@lists.infradead.org --- arch/um/kernel/mem.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/arch/um/kernel/mem.c b/arch/um/kernel/mem.c index 89c8c8b94a79..2bf858ab35b5 100644 --- a/arch/um/kernel/mem.c +++ b/arch/um/kernel/mem.c @@ -62,8 +62,11 @@ static unsigned long brk_end; void __init arch_mm_preinit(void) { +#ifdef CONFIG_KASAN /* Safe to call after jump_label_init(). Enables KASAN. */ - kasan_init_generic(); + if (!kasan_arg_disabled) + kasan_init_generic(); +#endif /* clear the zero-page */ memset(empty_zero_page, 0, PAGE_SIZE); -- 2.52.0