From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-wm1-f50.google.com (mail-wm1-f50.google.com [209.85.128.50]) (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 504BF33971D for ; Thu, 13 Nov 2025 17:58:59 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.128.50 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1763056742; cv=none; b=YkqujlFWz+uAidfX6AltDT70pyRC7WBjhSG2lVK7X2Ypf3zNc7dgZOaa3OzeGgxdx/39d3v2RxbSTmFciYSujkRFkio5p+rYQhXC9uUh8BfCsBnjD8encLNZOI3cWF3GHDryZ9uHhZuVmVZwFQIyJe489HjLCg1jXK9K4BMm7d0= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1763056742; c=relaxed/simple; bh=tzAHs/NW8hzxVyE7YgViwF3ICFGUKDmj3FMEsxS6U1Y=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=aWR4h+9xrmojvY4mQKURog4o8HllrHac+0c0EjTBAYxQcdDRR+9RLtQivGnPCruwTK5k68C3guLOlCC/OQ5e3PKfXiPyuLcDb6rwz1BGXFX1yBlbUzQerlwehiNrplk1GWeqmwmV5lzOV1NeTYLeSmHpXQP3V9FCWIveS5bTPvU= 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=FtGWwWjq; arc=none smtp.client-ip=209.85.128.50 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="FtGWwWjq" Received: by mail-wm1-f50.google.com with SMTP id 5b1f17b1804b1-477549b3082so9991095e9.0 for ; Thu, 13 Nov 2025 09:58:58 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1763056737; x=1763661537; 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=ONlXezZ8rYOFy9RaN+13wK2rQQVa66Pyx3TL3D7WvBY=; b=FtGWwWjqZFjpPt47P6Ju8vQUDh2w77wo3rilojDASBwiLmhr+U4TBZdbK0/XZLsJEL XGryyTvMkwp5vDHs7uV3O8qOa5KjDnn1rRAgIsxCFzc5khwhoVDYtzeeiwDWPaP9HQdw b50QahjM2tWnlynEOd2xg15yRJ30W/HacQOEV8cpeqG5vcE0Ivt33Nxz8b2GOO9dunN4 eASNN5elj7l+mKhEu9RnRUsEaQup7Dm9Ejo1lEqZwRPSGRIY9wCZqzb53z5LN4fNzZfk OBNUbzA08oIv9Ud3pxIBrFgrUW24KGwEwzhZMvIDSCd7Evq1uMhyswb3sboH6TPkpB0d kfkA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1763056737; x=1763661537; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:x-gm-gg:x-gm-message-state:from:to:cc:subject:date :message-id:reply-to; bh=ONlXezZ8rYOFy9RaN+13wK2rQQVa66Pyx3TL3D7WvBY=; b=CgOouFWQM2LUn0tHRgVtVwiU74rTaMzYxaTZSb/p4+d52voKtFjvyiSMSfvb1BO4L3 1BgTCdK4RT6djiz1gmKmFB2Vi0+ydZ5bILFe+inmbN4u9A9X7DH9biur6oMYbdOfxN51 R6WwYnyuYmnPO3ICrdPHgFOdxTKxROpwmgXZq4qa61dM9h8UTlIlqgXHpJTj8qnGJora 68YEIE8Dl8s/063fL4/WwHpTt9gGMqkRrFrgSO5jRGK08eR7+T9K1SsTMvSAx1ehH6bc 26U1Nu8JprSUgz4o7wiLhgbU3nrxc0KnPkdeES4i+PMiFpMKajySD6uJTjE9ZG9mkCDD S3yA== X-Forwarded-Encrypted: i=1; AJvYcCW6vcqbkGzQ8O720rztT+G3lz04rTmhsjUbC2g8vML+t2W4uxv3cpbo0KJbF0cI7YDozHkRNaR80O9HfE/Q@vger.kernel.org X-Gm-Message-State: AOJu0YyrtNiZEBsL/vaSImzwSttsU6vXG3I3NlFzt1LhRllxs4CIOQ0+ 0nfvVw/bqrLPUOmw+XQKfOCSp7InUAUxUK8UUWJD4de+zOCCjB4Bkv98 X-Gm-Gg: ASbGnctNn4LMDFezjZrNUgK1Swwh8dlVNOXoIGQxWiTDHNtM5Pj6RYSw/8j/N/BMnKW CYuf7seEObXCFOhVxe7big9y3jhxRsWr4YhUa8du1YT4v0y0vb3MACPMR9vSMixCdTnJNioVlKa pPthMmEGMJ+GAOFPHlIcgWuvwAdZp5zRLvBsAoIqR2N2L1IqCzohgZRnARyTwPox1X6brfJJixp rJX7f1Z2F1Tv9Ah9UuSp8uRfQQ3ceXVjLCr8yJlPs4HBIFyDogAO+srs8btexO7ky+rOD9P0J44 3/VJNobMj/adEjR0pGw4HJxumXxVWs1c2ewDoWQaWRaLM1RqYgzA3+hkiZFxVvGnkz8M3LlW8O2 fYv/ysclQrwn7Zespeu1mO5m8Kga3qd73Y9WkGqUihy9jLxV5wt0mPkTtQvJkRgnt3b4BYtvlXy kwK3JWPO66wkJUgiEqbS77BBmzU4NTvVHMJfPR/MNcTKhtVtr5 X-Google-Smtp-Source: AGHT+IHaYkfhslit1+bZ6h2bKwMphvfyMMNqhnEV5TKWd6eJOYYn+BKKgD1tVDFC16Scxd44ybfeUg== X-Received: by 2002:a05:600c:3104:b0:471:14f5:126f with SMTP id 5b1f17b1804b1-4778fea6cf6mr3947605e9.33.1763056736734; Thu, 13 Nov 2025 09:58:56 -0800 (PST) Received: from f.. (cst-prg-14-82.cust.vodafone.cz. [46.135.14.82]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-47787e95327sm98888575e9.12.2025.11.13.09.58.54 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 13 Nov 2025 09:58:56 -0800 (PST) From: Mateusz Guzik To: brauner@kernel.org, jlayton@kernel.org Cc: viro@zeniv.linux.org.uk, jack@suse.cz, linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org, Mateusz Guzik Subject: [PATCH v3 1/2] filelock: use a consume fence in locks_inode_context() Date: Thu, 13 Nov 2025 18:58:50 +0100 Message-ID: <20251113175852.2022230-1-mjguzik@gmail.com> X-Mailer: git-send-email 2.43.0 Precedence: bulk X-Mailing-List: linux-fsdevel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Matches the idiom of storing a pointer with a release fence and safely getting the content with a consume fence after. Eliminates an actual fence on some archs. Reviewed-by: Jeff Layton Signed-off-by: Mateusz Guzik --- include/linux/filelock.h | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/include/linux/filelock.h b/include/linux/filelock.h index 54b824c05299..dc15f5427680 100644 --- a/include/linux/filelock.h +++ b/include/linux/filelock.h @@ -241,7 +241,10 @@ bool locks_owner_has_blockers(struct file_lock_context *flctx, static inline struct file_lock_context * locks_inode_context(const struct inode *inode) { - return smp_load_acquire(&inode->i_flctx); + /* + * Paired with the fence in locks_get_lock_context(). + */ + return READ_ONCE(inode->i_flctx); } #else /* !CONFIG_FILE_LOCKING */ -- 2.48.1