From nobody Wed Dec 31 16:19:33 2025 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 7CDF5C4332F for ; Tue, 31 Oct 2023 15:44:40 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231691AbjJaPol (ORCPT ); Tue, 31 Oct 2023 11:44:41 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:40526 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229544AbjJaPoj (ORCPT ); Tue, 31 Oct 2023 11:44:39 -0400 Received: from mx0a-001b2d01.pphosted.com (mx0a-001b2d01.pphosted.com [148.163.156.1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id E71248F for ; Tue, 31 Oct 2023 08:44:36 -0700 (PDT) Received: from pps.filterd (m0360083.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.17.1.19/8.17.1.19) with ESMTP id 39VFErFP011868; Tue, 31 Oct 2023 15:44:24 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ibm.com; h=from : to : cc : subject : date : message-id : mime-version : content-transfer-encoding; s=pp1; bh=hcPfPdzQdn3iAnwDyKZq0p0knBZPODiqUl2zgguD4uU=; b=jMSYpk2bN7uISar83gP/SOJeylP+OPj3Hf2sgSkBM8WA8qDSfdsSpMgp36XYndJy7c8Y k0ZnysmWn9cHjpHKVaqPZ+0DB1iviLU3qjckjtTFQwxAGN3aZesGHQvN3eb4Oeqakt+B r+Gk/DX1mNL0PrYWDrCx5uOLjS5UMkEglkR1uFhA+8Voa7K2HI260kcm0f2AUEvxTnWG +75UA40W2csDkKH2qGQI1FfbtFpZLDH5gmXb+1xmyMcnSPjI2yA/kzVE+9r3aAmkmjMC RaFCCiw3KSx7JIrT07QgiYEQdjOBsX1OYBPsvaLFUnjKhrXnmVRiCrkDIFo3XuzUkbY5 rA== Received: from pps.reinject (localhost [127.0.0.1]) by mx0a-001b2d01.pphosted.com (PPS) with ESMTPS id 3u33qn1w1s-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Tue, 31 Oct 2023 15:44:24 +0000 Received: from m0360083.ppops.net (m0360083.ppops.net [127.0.0.1]) by pps.reinject (8.17.1.5/8.17.1.5) with ESMTP id 39VFF1Qp012731; Tue, 31 Oct 2023 15:44:23 GMT Received: from ppma13.dal12v.mail.ibm.com (dd.9e.1632.ip4.static.sl-reverse.com [50.22.158.221]) by mx0a-001b2d01.pphosted.com (PPS) with ESMTPS id 3u33qn1w1a-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Tue, 31 Oct 2023 15:44:23 +0000 Received: from pps.filterd (ppma13.dal12v.mail.ibm.com [127.0.0.1]) by ppma13.dal12v.mail.ibm.com (8.17.1.19/8.17.1.19) with ESMTP id 39VEH4It011310; Tue, 31 Oct 2023 15:44:23 GMT Received: from smtprelay04.wdc07v.mail.ibm.com ([172.16.1.71]) by ppma13.dal12v.mail.ibm.com (PPS) with ESMTPS id 3u1euk16f6-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Tue, 31 Oct 2023 15:44:22 +0000 Received: from smtpav01.dal12v.mail.ibm.com (smtpav01.dal12v.mail.ibm.com [10.241.53.100]) by smtprelay04.wdc07v.mail.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 39VFiL4J36831698 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Tue, 31 Oct 2023 15:44:21 GMT Received: from smtpav01.dal12v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 841AA58065; Tue, 31 Oct 2023 15:44:21 +0000 (GMT) Received: from smtpav01.dal12v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id D00CD5805D; Tue, 31 Oct 2023 15:44:20 +0000 (GMT) Received: from sbct-3.pok.ibm.com (unknown [9.47.158.153]) by smtpav01.dal12v.mail.ibm.com (Postfix) with ESMTP; Tue, 31 Oct 2023 15:44:20 +0000 (GMT) From: Stefan Berger To: linux-kernel@vger.kernel.org Cc: Stefan Berger , "Milton D. Miller II" , Rob Landley , Jeff Layton , Jens Axboe , Jim Cromie , Sam Ravnborg , Greg Kroah-Hartman , "Eric W. Biederman" , Alexander Viro , "H. Peter Anvin" , Mimi Zohar Subject: [RFC PATCH] rootfs: Use tmpfs for rootfs even if root= is given Date: Tue, 31 Oct 2023 11:44:17 -0400 Message-ID: <20231031154417.621742-1-stefanb@linux.ibm.com> X-Mailer: git-send-email 2.41.0 MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-TM-AS-GCONF: 00 X-Proofpoint-ORIG-GUID: 2LrlqeqYgtB4SLYojPQI_PGG228vNGTn X-Proofpoint-GUID: Xd9rqnfNRXDAGVBAN3DYBn_YOMaZETdg X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.272,Aquarius:18.0.987,Hydra:6.0.619,FMLib:17.11.176.26 definitions=2023-10-31_02,2023-10-31_03,2023-05-22_02 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 spamscore=0 priorityscore=1501 suspectscore=0 lowpriorityscore=0 bulkscore=0 phishscore=0 mlxlogscore=795 clxscore=1011 malwarescore=0 impostorscore=0 mlxscore=0 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2310240000 definitions=main-2310310125 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" rootfs currently does not use tmpfs if the root=3D boot option is passed even though the documentation about rootfs (added in 6e19eded3684) in Documentation/filesystems/ramfs-rootfs-initramfs.rst states: If CONFIG_TMPFS is enabled, rootfs will use tmpfs instead of ramfs by default. To force ramfs, add "rootfstype=3Dramfs" to the kernel command line. However, this currently does not work when root=3D is passed on the boot command line since then saved_root_name contains a string and prevents usage of tmpfs. Therefore, remove the check on saved_root_name to enable tmpfs for rootfs. Fixes: 6e19eded3684 ("initmpfs: use initramfs if rootfstype=3D or root=3D s= pecified") Signed-off-by: Stefan Berger Cc: "Milton D. Miller II" Cc: Rob Landley Cc: Jeff Layton Cc: Jens Axboe Cc: Jim Cromie Cc: Sam Ravnborg Cc: Greg Kroah-Hartman Cc: "Eric W. Biederman" Cc: Alexander Viro Cc: "H. Peter Anvin" Cc: Mimi Zohar --- init/do_mounts.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/init/do_mounts.c b/init/do_mounts.c index 5dfd30b13f48..6567cf5807ee 100644 --- a/init/do_mounts.c +++ b/init/do_mounts.c @@ -510,7 +510,7 @@ struct file_system_type rootfs_fs_type =3D { =20 void __init init_rootfs(void) { - if (IS_ENABLED(CONFIG_TMPFS) && !saved_root_name[0] && + if (IS_ENABLED(CONFIG_TMPFS) && (!root_fs_names || strstr(root_fs_names, "tmpfs"))) is_tmpfs =3D true; } --=20 2.40.1