From nobody Sat Oct 4 06:34:52 2025 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 0B8DD29ACFC for ; Wed, 20 Aug 2025 05:35:48 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=170.10.129.124 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1755668150; cv=none; b=nUXNB3UqMlPmJLlKyO6Kw/iDk9u1rYyIylmtNcJwwtWk+7auXjKU1UFsbQIYpzRmftZOa5Bf30dxtMRoDBrztuqnAe6vJOLf+8t9gMUqa56Lwq7QRERvlqtn5CH61HfWRtpzNRZjbh8q8D4/GRGJXvY91Xhjevqyl99U2Cf3nvc= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1755668150; c=relaxed/simple; bh=YgopKzfR0IJfsyEXF1E1nafRos8bsFb6WfDl5GYGKuA=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-type; b=PI4G89sSOhBhYaR+XExpkCiInirjvrO7mMaaRGLU9FOYVy7/kV26sY2LVQrWlN1GHMjOEIcJ6P05Imx+y6jD9sOtLeFDN/3h5ROtmpFqZCDctVUKm+2SIRxXsGIlfo8EZS635Qkc/Ji/vOk9rVjv3VtMECaqJn+4WKlRPs5botM= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=redhat.com; spf=pass smtp.mailfrom=redhat.com; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b=bjW5uPIB; arc=none smtp.client-ip=170.10.129.124 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=redhat.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=redhat.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="bjW5uPIB" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1755668147; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=lC7gxKLfCffY1/zE+RJo3yBumyZwu5V9Ft7avRiVVTY=; b=bjW5uPIBiR4bX9pUlJOHPjh899t6QWLhLkO5+zw1cw/qucaeVegZSV6kAl1+8pK/0TJCcz Jr0QZXScOkJLvdQfiQu+MqXCtATPRfJolw1HdeaJn2D6ioY5M5kIv5qGtcgXXHvVDw3pst ZGJ6loTk8YWJ/SoMlejhRx0UzHXX66g= Received: from mx-prod-mc-01.mail-002.prod.us-west-2.aws.redhat.com (ec2-54-186-198-63.us-west-2.compute.amazonaws.com [54.186.198.63]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-265-6LzTzuBZPxSmLJLuVYPWIw-1; Wed, 20 Aug 2025 01:35:41 -0400 X-MC-Unique: 6LzTzuBZPxSmLJLuVYPWIw-1 X-Mimecast-MFC-AGG-ID: 6LzTzuBZPxSmLJLuVYPWIw_1755668139 Received: from mx-prod-int-03.mail-002.prod.us-west-2.aws.redhat.com (mx-prod-int-03.mail-002.prod.us-west-2.aws.redhat.com [10.30.177.12]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mx-prod-mc-01.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id 4AE39195422A; Wed, 20 Aug 2025 05:35:39 +0000 (UTC) Received: from MiWiFi-R3L-srv.redhat.com (unknown [10.72.112.99]) by mx-prod-int-03.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTP id 9FD9E19560B0; Wed, 20 Aug 2025 05:35:29 +0000 (UTC) From: Baoquan He To: linux-mm@kvack.org Cc: ryabinin.a.a@gmail.com, andreyknvl@gmail.com, glider@google.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, christophe.leroy@csgroup.eu, Baoquan He Subject: [PATCH v3 03/12] mm/kasan/sw_tags: don't initialize kasan if it's disabled Date: Wed, 20 Aug 2025 13:34:50 +0800 Message-ID: <20250820053459.164825-4-bhe@redhat.com> In-Reply-To: <20250820053459.164825-1-bhe@redhat.com> References: <20250820053459.164825-1-bhe@redhat.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Scanned-By: MIMEDefang 3.0 on 10.30.177.12 Content-Type: text/plain; charset="utf-8" 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; =20 + if (kasan_arg_disabled) + return; + for_each_possible_cpu(cpu) per_cpu(prng_state, cpu) =3D (u32)get_cycles(); =20 kasan_init_tags(); =20 + /* KASAN is now initialized, enable it. */ + static_branch_enable(&kasan_flag_enabled); + pr_info("KernelAddressSanitizer initialized (sw-tags, stacktrace=3D%s)\n", str_on_off(kasan_stack_collection_enabled())); } --=20 2.41.0