From patchwork Mon Oct 7 08:52:37 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Uros Bizjak X-Patchwork-Id: 13824365 Received: from mail-wm1-f54.google.com (mail-wm1-f54.google.com [209.85.128.54]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id BDB3618BBB4; Mon, 7 Oct 2024 08:53:08 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.128.54 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1728291190; cv=none; b=kJ8aMReskSkPX0QwdeOOgKUBamySi1+Yw/Fa9wINwwFQuWoPscIpwJEd3XpNdhxpBkMhbclUDTD/wrVjqTd582g/kxQxjtQQB4Znmq83HBneX3mffyh9icY4EF/pCSX4T3pHGdf9YnVHQBWCLRqxsWo1p1u9p4QW1UInv3IAI3s= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1728291190; c=relaxed/simple; bh=Dt8anasy0laNKdHF0W5V+tqgv3LYZ9v/t1hjF/BjQgw=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=fAE0h3kACBZJM5lNo4L2fGcH39xgWf03JeSX0+tBvN/HYzNZqSgcPbTMGptCo8uIVyye5DR+ykcV/h1zDUkNv4d5bZJHxRTXJykFfWzAfhjiT/fm4usvlZB3FkrIvmdbSdBM6L9flJiYW0o90Fzgp5p+gXx2cTCkfvr3UMU39XI= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com; spf=pass smtp.mailfrom=gmail.com; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b=BghIaYr0; arc=none smtp.client-ip=209.85.128.54 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmail.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="BghIaYr0" Received: by mail-wm1-f54.google.com with SMTP id 5b1f17b1804b1-42e5e758093so35356305e9.1; Mon, 07 Oct 2024 01:53:08 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1728291187; x=1728895987; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:from:to:cc:subject:date:message-id:reply-to; bh=9e53axX5+JQ6EBke6BbptR+qC5MfqAfQKE74IO6eBWA=; b=BghIaYr0OezwccUoXy8n9iqvo8zZrhncpwdEF9xsV4yZoLoqj4OOeyrmTShWNc+bE8 V79EIql6D3c3plsdl9cBlMmX1aMUeqqOsfQcZUTSW5jpGIYGj27gCJ479Bx/jPr+8SHa PpBu3mk6NaO7OwTnZDq490B0PHvvUAkvEHkpsaXBFTJYJVQhLHUf7pD2dEOB55VoijeY HfzbOdO1cPzHiajUavgNskX4HNMc81rl8hGKmyJ5NVJ99JxGMI6KZ5triP/9CCVpJQtr UR9jwy6HE+dC7dm9T0C6HOqU7w/CGiyI/4D16Hwv6TnqKw0uFaIq5ECEI1mSdE9ehAnj 05Ng== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1728291187; x=1728895987; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=9e53axX5+JQ6EBke6BbptR+qC5MfqAfQKE74IO6eBWA=; b=PEru1w1kGNYCx/iXyEflKgptfCoAmHpJ/0oLYT7XwNu0q0mmj7ShD+yfVeyAFwbE1J zT2O2psxn2UDoHutTqrhjitIfHUqaK89Yc4BtajozVMw7VP2LE00r7ryaRCUp1qO8y1S QZ0OPs7e3Uc+czUm7yCRcwuYyvstsGORwDLL10YFQcePfBUzL4K5QawFvCmOJBE4Qa0c MRM801g6h/jsiWQ5xSyP/tnslxjZDpTAcjcvyYN1UYLuiF2J3U4RWl+OS7jFz1SJJZmI tOKs77RoVEyfBjhNN24kjOhj+5PvFeAsFa0wZBO8W0UraAaO5ZQbU75O34kgb9epgvK0 pEEg== X-Forwarded-Encrypted: i=1; AJvYcCWwTGZ69SHBfqm5d1yE6dAOeSBj527zZdL4zSbz6pu6l+gAStoKHl0x6khABTcCnnR5cTUljW8sYYrxFUk=@vger.kernel.org X-Gm-Message-State: AOJu0YyGV+zxN5f3kkzlxhJ2Vjn9kKYdtgvBDiugLlDXZ8QXaITTFTBX J5N2yTguIQWfqeT9OBxBBEqVvA1p2ZimfV/054vBGGpiqbb9GwWvrgCjBPa7h6w= X-Google-Smtp-Source: AGHT+IEOCqzTwmrbjB1VBZ0KaELcwYeEQJz8mgwHyCVQIEqwxF3yAa9d9z05gmbVhoYy8tqATTLd9Q== X-Received: by 2002:a05:600c:524c:b0:42c:bae0:f065 with SMTP id 5b1f17b1804b1-42f85aa32famr80686945e9.5.1728291186493; Mon, 07 Oct 2024 01:53:06 -0700 (PDT) Received: from fedora.iskraemeco.si ([193.77.86.250]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-42f89ed9d4bsm68244295e9.42.2024.10.07.01.53.05 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 07 Oct 2024 01:53:06 -0700 (PDT) From: Uros Bizjak To: linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org Cc: Uros Bizjak , Alexander Viro , Christian Brauner , Jan Kara Subject: [PATCH] namespace: Use atomic64_inc_return() in alloc_mnt_ns() Date: Mon, 7 Oct 2024 10:52:37 +0200 Message-ID: <20241007085303.48312-1-ubizjak@gmail.com> X-Mailer: git-send-email 2.46.2 Precedence: bulk X-Mailing-List: linux-fsdevel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Use atomic64_inc_return(&ref) instead of atomic64_add_return(1, &ref) to use optimized implementation and ease register pressure around the primitive for targets that implement optimized variant. Signed-off-by: Uros Bizjak Cc: Alexander Viro Cc: Christian Brauner Cc: Jan Kara --- fs/namespace.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/fs/namespace.c b/fs/namespace.c index 93c377816d75..9a3c251d033d 100644 --- a/fs/namespace.c +++ b/fs/namespace.c @@ -3901,7 +3901,7 @@ static struct mnt_namespace *alloc_mnt_ns(struct user_namespace *user_ns, bool a } new_ns->ns.ops = &mntns_operations; if (!anon) - new_ns->seq = atomic64_add_return(1, &mnt_ns_seq); + new_ns->seq = atomic64_inc_return(&mnt_ns_seq); refcount_set(&new_ns->ns.count, 1); refcount_set(&new_ns->passive, 1); new_ns->mounts = RB_ROOT;