From nobody Sat Oct 4 06:34:48 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 E46C4280312 for ; Wed, 20 Aug 2025 05:36:06 +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=1755668168; cv=none; b=WTwFjYY2gzY7DhSH+4UWSHiGfPNNazPza1GQbTOnGnxuCPdJesGJK1/jkWl0fa26nQgXEhvSDi1yeE5cq/K/ik1qjed+ozdOAgDN0itnSZ5mmIkiLDlrSXl4DhgjL0YrTOWgqTMC9/Zp5i24A2THrqvpc1gkLbdci4o9uiccNM0= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1755668168; c=relaxed/simple; bh=Ha4cG8e+lmVLPwK0pubt1aRx8Xy2hVzAOdLAnVjJZs0=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-type; b=j1hJ4Tc7NcxJcdiHllpdyaGY+KI3JOleG+HSu1zWOcnHgsjWOdMqkqp2JlXKC7NjwfvBOkBEsNjpfZhLSsykSFuOqq88HLwaASNjBdCMfBjsMmMxYQMY2bHg+YvCwT5fleHr5Z7kMO7EFnHhaPMkfkbP4wxRW9Qt/pNQb3AvBWI= 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=NQpyXpXI; 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="NQpyXpXI" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1755668166; 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=oS87V1n70KnlvoMP4fCQ/ERdyh1R0fC3CtG4IQhVRyE=; b=NQpyXpXIuo4gb+nLrA2gyx7cMKaPDfOW1K5Q3Bj+aVUXS7VwtZufAU3y512QD6/A9vYpoV Ike1vEw5Gyw9orKdqwbywFiYUQLMwLClCg6nUHqBYHqf2IgWkdVcbvzyT0YOZF5anmNQrf PGsa+yP5M6okFdJdyrVmBkG0YK/i2tY= Received: from mx-prod-mc-05.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-547-NwZMdlajPhyC9_mbi6VafA-1; Wed, 20 Aug 2025 01:36:00 -0400 X-MC-Unique: NwZMdlajPhyC9_mbi6VafA-1 X-Mimecast-MFC-AGG-ID: NwZMdlajPhyC9_mbi6VafA_1755668158 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-05.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id 84A5019775AF; Wed, 20 Aug 2025 05:35:58 +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 2B42719560B2; Wed, 20 Aug 2025 05:35:49 +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 , linux-arm-kernel@lists.infradead.org Subject: [PATCH v3 05/12] arch/arm64: don't initialize kasan if it's disabled Date: Wed, 20 Aug 2025 13:34:52 +0800 Message-ID: <20250820053459.164825-6-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. And also need skip kasan_populate_early_vm_area_shadow() if kasan is disabled. Signed-off-by: Baoquan He Cc: linux-arm-kernel@lists.infradead.org --- arch/arm64/mm/kasan_init.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/arch/arm64/mm/kasan_init.c b/arch/arm64/mm/kasan_init.c index d541ce45daeb..0e4ffe3f5d0e 100644 --- a/arch/arm64/mm/kasan_init.c +++ b/arch/arm64/mm/kasan_init.c @@ -384,6 +384,9 @@ void __init kasan_populate_early_vm_area_shadow(void *s= tart, unsigned long size) { unsigned long shadow_start, shadow_end; =20 + if (!kasan_enabled()) + return; + if (!is_vmalloc_or_module_addr(start)) return; =20 @@ -397,6 +400,9 @@ void __init kasan_populate_early_vm_area_shadow(void *s= tart, unsigned long size) =20 void __init kasan_init(void) { + if (kasan_arg_disabled) + return; + kasan_init_shadow(); kasan_init_depth(); #if defined(CONFIG_KASAN_GENERIC) @@ -405,6 +411,7 @@ void __init kasan_init(void) * Software and Hardware Tag-Based modes still require * kasan_init_sw_tags() and kasan_init_hw_tags() correspondingly. */ + static_branch_enable(&kasan_flag_enabled); pr_info("KernelAddressSanitizer initialized (generic)\n"); #endif } --=20 2.41.0