From patchwork Fri Dec 8 09:06:19 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Yafang Shao X-Patchwork-Id: 13485032 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="XH6DXY8D" Received: from mail-pl1-x636.google.com (mail-pl1-x636.google.com [IPv6:2607:f8b0:4864:20::636]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 2C66A170F; Fri, 8 Dec 2023 01:06:45 -0800 (PST) Received: by mail-pl1-x636.google.com with SMTP id d9443c01a7336-1d04c097e34so15036265ad.0; Fri, 08 Dec 2023 01:06:45 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1702026404; x=1702631204; 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=xHJ+KYyJ1jZcwPU6L/9C8DimrQ09bt4oL7onSyu8iGg=; b=XH6DXY8D5gyFTslQppy+82NmXrapItp3XX5qEm+B80K8SC85UTAO/PJe/uanOA1rIB MhfxlsptXdYNOZdTC2yG6pcgrSjGahv69Uh7kU0yuskfl4VgI6OLO1MC5rfSh1ON/BMo WavjjOSgL0hV1QkN4QYRHibAkfrZgejcKavmta98kA5mJSZKupbKFa4eMGsgocWqn3B8 xk67wpW+xgJoAug5ZNSZe8RkDeNpjradl2WWdvHpZnlwmv5wAU1N3+OFNiAA6Pvvt96e +NrZtvbugPEiRXxMk3mx2X480k2sOs35v6DU/vPcXk0vZTMJplcKgZB/AEtnuROw0U3L 8fwQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1702026404; x=1702631204; 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=xHJ+KYyJ1jZcwPU6L/9C8DimrQ09bt4oL7onSyu8iGg=; b=LwCHn5OqdtKBnI/z+DN0GTz6SFr6Ry0tg5Q/AuaYIyfljcL2scV3YjjgPMk7pSK+U/ HNtcIpnRNRucG180mdA9YLN8YiRP62Q9N0y9ICEs/mkLAzcIyCSY3PLLmT37bGWZOVX3 VWIB+nwDIfqjez0Xd6/OJm77e6xE+ItfXDR6eEPoqbGgZeEO1H5UpYBt2F51upGebXB5 E2cOvl69zuU727b1cJExPzRTUuC3jgGZ8f+j6M1Kx0ZEp/8kEAfZo1S1T6dssvI6F9wD ptIB1/cAJRglkScf5n7t4Wo61pdlvKAtXzw1p6AE5be/W1dXib3wb+rBujrllMWBJoxh yOZw== X-Gm-Message-State: AOJu0Yy4soRU9INE1uLFmtW2cLhQVFQiSl7VIE5MmPJEixpU55LGKHbB skrKFEIuJv+coW1DlH9woVQ= X-Google-Smtp-Source: AGHT+IGDD+5m4P7ro9+jd2WHzgWnxmWzxe8aGNd9wryRLo3x0jXWLZRXgUnqD7rwbEtBQ9pvrJvDCw== X-Received: by 2002:a17:902:d54c:b0:1d0:6ffd:6101 with SMTP id z12-20020a170902d54c00b001d06ffd6101mr856123plf.35.1702026404515; Fri, 08 Dec 2023 01:06:44 -0800 (PST) Received: from vultr.guest ([2001:19f0:ac00:4055:5400:4ff:fead:3bd0]) by smtp.gmail.com with ESMTPSA id 21-20020a170902ee5500b001d057080022sm1188173plo.20.2023.12.08.01.06.43 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 08 Dec 2023 01:06:44 -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, ying.huang@intel.com Cc: linux-mm@kvack.org, linux-security-module@vger.kernel.org, bpf@vger.kernel.org, ligang.bdlg@bytedance.com, Yafang Shao , Eric Dumazet Subject: [PATCH v4 2/5] mm: mempolicy: Revise comment regarding mempolicy mode flags Date: Fri, 8 Dec 2023 09:06:19 +0000 Message-Id: <20231208090622.4309-3-laoar.shao@gmail.com> X-Mailer: git-send-email 2.39.3 In-Reply-To: <20231208090622.4309-1-laoar.shao@gmail.com> References: <20231208090622.4309-1-laoar.shao@gmail.com> Precedence: bulk X-Mailing-List: bpf@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 Reviewed-by: "Huang, Ying" Cc: Eric Dumazet --- 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 a8963f7..afed4a4 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 */