From nobody Thu Dec 18 05:35:54 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 3306EC61DA7 for ; Wed, 22 Nov 2023 21:12:18 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1344365AbjKVVMS (ORCPT ); Wed, 22 Nov 2023 16:12:18 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:37076 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1343845AbjKVVMN (ORCPT ); Wed, 22 Nov 2023 16:12:13 -0500 Received: from mail-pf1-x442.google.com (mail-pf1-x442.google.com [IPv6:2607:f8b0:4864:20::442]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 986F9D47; Wed, 22 Nov 2023 13:12:08 -0800 (PST) Received: by mail-pf1-x442.google.com with SMTP id d2e1a72fcca58-6b709048f32so265316b3a.0; Wed, 22 Nov 2023 13:12:08 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1700687528; x=1701292328; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=UftY+9nJn82Vz5RJpbG87UiQLd2iCLBgMyI8O4iubXI=; b=EU3eyIJ/OBG42+qF2vpTOldu0KNB6DVzZQCeaQEQGVPoYN//InAIWxAtun2WfIbfzH TWL/XIqYPkNYEO0ZcxkFbx5D0BWnzTmRCjmaeR3eE7HpgzthwbT3vkWN4waN4E4fv4lj ejhd+zXWGt2stqG8f3YZabC7dhahyRFITCiMxPGVDI1sUv9dGbQLI/kYdqeetVG/pnpo bHBy6XrK0QUFX9YoK5H199sT2humxLXx/3L2chjv8RHA4KcGrqsSvZRjfv30JMHC7dcG wEYsucJjsdGiZORhNIk4n+tgfJC53U1lsbcr1pC7bZUgw9Bz3ZnVgt0o6khP8OP6TOGp TE4g== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1700687528; x=1701292328; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=UftY+9nJn82Vz5RJpbG87UiQLd2iCLBgMyI8O4iubXI=; b=fFKtZMn/rKIod9M/FtNiwFu98MJDfLm9Hfzh40zNv3kgktPIN0voao6anea9YcbUqA sHVrNVPAHqDuu4ubAAlBnF+qeAgMbT3fOtskJeuxVdhiErpiW+4Mdh3PhiqqBYjM6rq2 lkXJZ6DYHkMBuu32pN8IKbgDCaS/t41bT1EMDfhFxeo8/L9nyveFOfP+KRMwzrSq016/ GLKCh+31GpLjooUWWgNoGGk04Viv+iof+SbWuRUdE17ukE2aSQHonKawRrQWUF2ZTfND 6VX2otg6qz0WRQ3iN+sUKg6ITAlBXEv5IBLPJnrQtjrA7Lg5ZB9TnchWDmZ/86QuUUiO 7aFw== X-Gm-Message-State: AOJu0Yz3APQDHBHmgxDc2CIDoDPbHRiMOs2xRbk4rEA5WtKVEd03ku5C B04r0jQ/9wT4014SUL3y7w== X-Google-Smtp-Source: AGHT+IFApmrVmTMi/koEr4L/CLh547UBRzR9U2yTau9qj52IoeLKDXr1/nWf98+BfkPjiCFsngGxIQ== X-Received: by 2002:a05:6a00:4ac7:b0:6c2:cf23:3e21 with SMTP id ds7-20020a056a004ac700b006c2cf233e21mr4101209pfb.17.1700687527998; Wed, 22 Nov 2023 13:12:07 -0800 (PST) Received: from fedora.mshome.net ([75.167.214.230]) by smtp.gmail.com with ESMTPSA id j18-20020a635512000000b005bdbce6818esm132136pgb.30.2023.11.22.13.12.06 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 22 Nov 2023 13:12:07 -0800 (PST) From: Gregory Price X-Google-Original-From: Gregory Price To: linux-mm@kvack.org Cc: linux-doc@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-api@vger.kernel.org, linux-arch@vger.kernel.org, linux-kernel@vger.kernel.org, akpm@linux-foundation.org, arnd@arndb.de, tglx@linutronix.de, luto@kernel.org, mingo@redhat.com, bp@alien8.de, dave.hansen@linux.intel.com, x86@kernel.org, hpa@zytor.com, mhocko@kernel.org, tj@kernel.org, ying.huang@intel.com, Gregory Price Subject: [RFC PATCH 01/11] mm/mempolicy: refactor do_set_mempolicy for code re-use Date: Wed, 22 Nov 2023 16:11:50 -0500 Message-Id: <20231122211200.31620-2-gregory.price@memverge.com> X-Mailer: git-send-email 2.39.1 In-Reply-To: <20231122211200.31620-1-gregory.price@memverge.com> References: <20231122211200.31620-1-gregory.price@memverge.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" Refactors do_set_mempolicy into replace_mempolicy and do_set_mempolicy so that replace_mempolicy can be re-used with new code, not just the system call. Signed-off-by: Gregory Price --- mm/mempolicy.c | 36 +++++++++++++++++++++++------------- 1 file changed, 23 insertions(+), 13 deletions(-) diff --git a/mm/mempolicy.c b/mm/mempolicy.c index 10a590ee1c89..410754d56e46 100644 --- a/mm/mempolicy.c +++ b/mm/mempolicy.c @@ -809,28 +809,20 @@ static int mbind_range(struct vma_iterator *vmi, stru= ct vm_area_struct *vma, return vma_replace_policy(vma, new_pol); } =20 -/* Set the process memory policy */ -static long do_set_mempolicy(unsigned short mode, unsigned short flags, - nodemask_t *nodes) +/* Attempt to replace mempolicy, release the old one if successful */ +static long replace_mempolicy(struct mempolicy *new, nodemask_t *nodes) { - struct mempolicy *new, *old; + struct mempolicy *old =3D NULL; NODEMASK_SCRATCH(scratch); int ret; =20 if (!scratch) return -ENOMEM; =20 - new =3D mpol_new(mode, flags, nodes); - if (IS_ERR(new)) { - ret =3D PTR_ERR(new); - goto out; - } - task_lock(current); ret =3D mpol_set_nodemask(new, nodes, scratch); if (ret) { task_unlock(current); - mpol_put(new); goto out; } =20 @@ -838,14 +830,32 @@ static long do_set_mempolicy(unsigned short mode, uns= igned short flags, current->mempolicy =3D new; if (new && new->mode =3D=3D MPOL_INTERLEAVE) current->il_prev =3D MAX_NUMNODES-1; +out: task_unlock(current); mpol_put(old); - ret =3D 0; -out: + NODEMASK_SCRATCH_FREE(scratch); return ret; } =20 +/* Set the process memory policy */ +static long do_set_mempolicy(unsigned short mode, unsigned short flags, + nodemask_t *nodes) +{ + struct mempolicy *new; + int ret; + + new =3D mpol_new(mode, flags, nodes); + if (IS_ERR(new)) + return PTR_ERR(new); + + ret =3D replace_mempolicy(new, nodes); + if (ret) + mpol_put(new); + + return ret; +} + /* * Return nodemask for policy for get_mempolicy() query * --=20 2.39.1