From patchwork Wed Nov 22 14:15:55 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Yafang Shao X-Patchwork-Id: 13464942 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="ax5lL78t" Received: from mail-pf1-x42b.google.com (mail-pf1-x42b.google.com [IPv6:2607:f8b0:4864:20::42b]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 860C718E; Wed, 22 Nov 2023 06:16:22 -0800 (PST) Received: by mail-pf1-x42b.google.com with SMTP id d2e1a72fcca58-6be0277c05bso6108714b3a.0; Wed, 22 Nov 2023 06:16:22 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1700662581; x=1701267381; 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=a1wPdyu7ENjoKkwP42urAAujwzKPPcBKgK7aJbdTPeE=; b=ax5lL78th+Z22g/QoSweLLbYNQSWAEnGgTrbugudd31M8Pe8dgxUS9Izib712edpTp laj6FClvm6F58PQtRG9TmRwLVy3P+6J5NeR7Fc/SDs3KD0wwggNYTp1ldVaJ7dHPzJbs l6Cr0MUMBX+s85eCvC0Ew1NjIuI1C4doSpDeWZq2B8uyuRnl5YiL2msRw7iHoXG4NdZE RdAAC9tEHSpv0CRvqgzcgv0aCs73O5lcuNvC9J5xpNNcN3jPs+MknjBydJ4qTjhEuZwi aXkTEK8G5N0DNOn9nmtQJfUsV/mqOlzyiC3sLA2AKmg0SbG+15jEmqYZ/jIw/3GhB99C cnCw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1700662581; x=1701267381; 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=a1wPdyu7ENjoKkwP42urAAujwzKPPcBKgK7aJbdTPeE=; b=P7l/bqth0m0UAhToEbSA8iCA739Jd4Bb2BixOmDm6ee2VyDtXi7Oiojv8C4lcRvdVp nYyEMcb0pizZN/VAGtezlmATEctIsImaTbHMguKoN4C26hMyC4wiazYtQOxwT8QAl9Qu 3FnlCE0dgdv6/3/UBOuZHusykTISbwTAtnyxagVATSrRAsLCU6EvIrJd+Ej9bqRdA6tF MNm8j/sb1nVOZR/LNq4ypXRig8jWuvtxFuQWjh2rDrCAvNU+TnC2NVP3lW7tnyK5hA8H lfs5lcm0ZDqllyJ6ElUEITgdOdfr+YjXtUde3/Yd8V3nUC3uhoOcJOrXfNskGOrpYQMi GhuA== X-Gm-Message-State: AOJu0YyVjVgogNawburcyffpHBwD+ZEFIbsWYLVSOiBgeF5ilp8TAvUb qRZRQcxh0txpvrVq+RVu1GY= X-Google-Smtp-Source: AGHT+IE6MKBa9DH0DLtzNahG0PY3BEbv8SQ3K8eKqp+aMh3wCYdSUNsYu1dxH5w+xaX+5VuH6wLbEA== X-Received: by 2002:a05:6a21:33a4:b0:18b:4a28:6e2d with SMTP id yy36-20020a056a2133a400b0018b4a286e2dmr1310481pzb.22.1700662581452; Wed, 22 Nov 2023 06:16:21 -0800 (PST) Received: from vultr.guest ([2001:19f0:ac01:a71:5400:4ff:fea8:5687]) by smtp.gmail.com with ESMTPSA id p18-20020a63fe12000000b0058988954686sm9356260pgh.90.2023.11.22.06.16.20 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 22 Nov 2023 06:16:20 -0800 (PST) From: Yafang Shao To: akpm@linux-foundation.org, paul@paul-moore.com, jmorris@namei.org, serge@hallyn.com, omosnace@redhat.com, mhocko@suse.com Cc: linux-mm@kvack.org, linux-security-module@vger.kernel.org, bpf@vger.kernel.org, ligang.bdlg@bytedance.com, Yafang Shao , Eric Dumazet , "Huang, Ying" Subject: [RFC PATCH v2 2/6] mm: mempolicy: Revise comment regarding mempolicy mode flags Date: Wed, 22 Nov 2023 14:15:55 +0000 Message-Id: <20231122141559.4228-3-laoar.shao@gmail.com> X-Mailer: git-send-email 2.39.3 In-Reply-To: <20231122141559.4228-1-laoar.shao@gmail.com> References: <20231122141559.4228-1-laoar.shao@gmail.com> Precedence: bulk X-Mailing-List: linux-security-module@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 MPOL_F_STATIC_NODES, MPOL_F_RELATIVE_NODES, and MPOL_F_NUMA_BALANCING are mode flags applicable to both set_mempolicy(2) and mbind(2) system calls. It's worth noting that MPOL_F_NUMA_BALANCING was initially introduced in commit bda420b98505 ("numa balancing: migrate on fault among multiple bound nodes") exclusively for set_mempolicy(2). However, it was later made a shared flag for both set_mempolicy(2) and mbind(2) following commit 6d2aec9e123b ("mm/mempolicy: do not allow illegal MPOL_F_NUMA_BALANCING | MPOL_LOCAL in mbind()"). This revised version aims to clarify the details regarding the mode flags. Signed-off-by: Yafang Shao Cc: Eric Dumazet Cc: "Huang, Ying" Reviewed-by: "Huang, Ying" --- include/uapi/linux/mempolicy.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/include/uapi/linux/mempolicy.h b/include/uapi/linux/mempolicy.h index a8963f7ef4c2..afed4a45f5b9 100644 --- a/include/uapi/linux/mempolicy.h +++ b/include/uapi/linux/mempolicy.h @@ -26,7 +26,7 @@ enum { MPOL_MAX, /* always last member of enum */ }; -/* Flags for set_mempolicy */ +/* Flags for set_mempolicy() or mbind() */ #define MPOL_F_STATIC_NODES (1 << 15) #define MPOL_F_RELATIVE_NODES (1 << 14) #define MPOL_F_NUMA_BALANCING (1 << 13) /* Optimize with NUMA balancing if possible */