From nobody Sat Oct 4 22:35:27 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 5DAF12571D7 for ; Tue, 12 Aug 2025 12:50:39 +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=1755003041; cv=none; b=BYptmIPSQkcZBiWjb+ppBZ5KZTsIstWm1G0hBCrC1cVSFy+xwCQOlNW0p3+BIRFdFWmNtjUeZ1nJdt6Y1igMUo2wX9B22pM6q+pltQ6uftv9qLeTJ6JXGveSUdG4+dAym9KGiKaXqF5s83tnfd36fTHr4ySTyMjKVHW64A/uTt4= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1755003041; c=relaxed/simple; bh=684V2Sd3lEmleyXlZL6uzzLUkwfe66EuDnmd4KUxaUU=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-type; b=DpAlbud43fJC2MkbdzLDvxCX5R3cKdcFVnlVBkxdESCYp/PjSCLV+vDDZZ/vWh2xCf5NtRg8j1CvVVRLJCMT++ySOTDkafBT/wEmdsS/aPTlZZZgP6a01zIarmTPdjqUbUGMOwwvhxp0LLvGsDn/cO8Y9gV5wiwWHfwQaTnvjjo= 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=F+UDNhOU; 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="F+UDNhOU" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1755003039; 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=rmch9LxILHmDSZgEKLxWACfFjV5jmswbcfLkcrWwQo8=; b=F+UDNhOUVjTwuAHAobuTyqBxjNH/0OWzY0T0WrGhBWZR7fbYYgmKFHTzfZbYgAVnY06t+d zZ/odquAFXnkzlaQHMXDU2dyuVRF4eKGiIvNoTlDqoaP+RgI7VC5cOXYV74Dht8tEe/+pj vZmTwLq2Ct8BjY6tVhODs/N7UcdMYl8= Received: from mx-prod-mc-03.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-57-v2GUSWdCNJ2cbTTT3izsjQ-1; Tue, 12 Aug 2025 08:50:34 -0400 X-MC-Unique: v2GUSWdCNJ2cbTTT3izsjQ-1 X-Mimecast-MFC-AGG-ID: v2GUSWdCNJ2cbTTT3izsjQ_1755003030 Received: from mx-prod-int-01.mail-002.prod.us-west-2.aws.redhat.com (mx-prod-int-01.mail-002.prod.us-west-2.aws.redhat.com [10.30.177.4]) (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-03.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id 0D25E19560B5; Tue, 12 Aug 2025 12:50:30 +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 D92EC3001458; Tue, 12 Aug 2025 12:50:22 +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 05/12] arch/arm64: don't initialize kasan if it's disabled Date: Tue, 12 Aug 2025 20:49:34 +0800 Message-ID: <20250812124941.69508-6-bhe@redhat.com> In-Reply-To: <20250812124941.69508-1-bhe@redhat.com> References: <20250812124941.69508-1-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 3.4.1 on 10.30.177.4 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 --- 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