From nobody Sat Feb 7 21:52:57 2026 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 5C008EB64D7 for ; Tue, 20 Jun 2023 18:33:35 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229827AbjFTSde (ORCPT ); Tue, 20 Jun 2023 14:33:34 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:60418 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229977AbjFTSdY (ORCPT ); Tue, 20 Jun 2023 14:33:24 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [IPv6:2604:1380:4641:c500::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 7553D1984 for ; Tue, 20 Jun 2023 11:33:19 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id DD51B6140F for ; Tue, 20 Jun 2023 18:33:18 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id D1EC1C433C8; Tue, 20 Jun 2023 18:33:17 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1687285998; bh=SqvhAodB465EsF7b1FR43lL1U65Vj+cZWCGrIetux8Y=; h=From:To:Cc:Subject:Date:From; b=chu0PrrFYy6l4aQH5YUrizUqIiYD5ldCLqo6p3KLUKCB3y9OH7OTLvMN2HFEd9QtI Q5t/2k4Knhg8mR9SBGuJtIi9QeslPAyiSm/vYJgzqfvV6uzfdUP7w/CCAz7wJVNH4I haHcyMwPEXYUcyKw3aWWCIxq33z/CymbhGiodCTE= From: Greg Kroah-Hartman To: linux-mm@kvack.org Cc: linux-kernel@vger.kernel.org, Ivan Orlov , Andrew Morton , Greg Kroah-Hartman Subject: [PATCH] mm: backing-dev: make bdi_class a static const structure Date: Tue, 20 Jun 2023 20:33:15 +0200 Message-ID: <20230620183314.682822-2-gregkh@linuxfoundation.org> X-Mailer: git-send-email 2.41.0 MIME-Version: 1.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=1837; i=gregkh@linuxfoundation.org; h=from:subject; bh=K0CQkPBo/+H1fLv6yQzfATV1NVqEuRkRSTLa+uZOhmc=; b=owGbwMvMwCRo6H6F97bub03G02pJDCkTP7zKtLnNftK6O6B49SrPd9OirXJfye8w0fhjYLXqx FF3B+3dHbEsDIJMDLJiiixftvEc3V9xSNHL0PY0zBxWJpAhDFycAjCRPY8Y5mfE3Hxy/ITP3dVT NtxxiN0b3pq0aQXD/NpZH1rF94j09Hdw3VuT/lPH/5ZmJwA= X-Developer-Key: i=gregkh@linuxfoundation.org; a=openpgp; fpr=F4B60CC5BF78C2214A313DCB3147D40DDB2DFB29 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" From: Ivan Orlov Now that the driver core allows for struct class to be in read-only memory, move the bdi_class structure to be declared at build time placing it into read-only memory, instead of having to be dynamically allocated at load time. Cc: Andrew Morton Cc: linux-mm@kvack.org Suggested-by: Greg Kroah-Hartman Signed-off-by: Ivan Orlov Signed-off-by: Greg Kroah-Hartman --- mm/backing-dev.c | 17 +++++++++++------ 1 file changed, 11 insertions(+), 6 deletions(-) diff --git a/mm/backing-dev.c b/mm/backing-dev.c index 7da9727fcdf3..3ffc3cfa7a14 100644 --- a/mm/backing-dev.c +++ b/mm/backing-dev.c @@ -20,7 +20,6 @@ struct backing_dev_info noop_backing_dev_info; EXPORT_SYMBOL_GPL(noop_backing_dev_info); =20 -static struct class *bdi_class; static const char *bdi_unknown_name =3D "(unknown)"; =20 /* @@ -345,13 +344,19 @@ static struct attribute *bdi_dev_attrs[] =3D { }; ATTRIBUTE_GROUPS(bdi_dev); =20 +static const struct class bdi_class =3D { + .name =3D "bdi", + .dev_groups =3D bdi_dev_groups, +}; + static __init int bdi_class_init(void) { - bdi_class =3D class_create("bdi"); - if (IS_ERR(bdi_class)) - return PTR_ERR(bdi_class); + int ret; + + ret =3D class_register(&bdi_class); + if (ret) + return ret; =20 - bdi_class->dev_groups =3D bdi_dev_groups; bdi_debug_init(); =20 return 0; @@ -1001,7 +1006,7 @@ int bdi_register_va(struct backing_dev_info *bdi, con= st char *fmt, va_list args) return 0; =20 vsnprintf(bdi->dev_name, sizeof(bdi->dev_name), fmt, args); - dev =3D device_create(bdi_class, NULL, MKDEV(0, 0), bdi, bdi->dev_name); + dev =3D device_create(&bdi_class, NULL, MKDEV(0, 0), bdi, bdi->dev_name); if (IS_ERR(dev)) return PTR_ERR(dev); =20 --=20 2.41.0