From mboxrd@z Thu Jan 1 00:00:00 1970 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 bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id B2929C0218D for ; Wed, 29 Jan 2025 23:03:52 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Date:Cc:To:From:Subject:Message-ID:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=HKwGagGYJOnFpm7QZehfdHxlBcdddFhpSOTecXy49mI=; b=IVevULYbkfkQ8b 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Jan 2025 23:03:39 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1738191820; bh=DnBs/c57gTqdpWP75OItXgwuRYg/4fzsHcSFgQrEO5I=; h=Subject:From:To:Cc:Date:In-Reply-To:References:From; b=Tms7RdzMGIa5FtXsetmCkKbIvQelWoEBToY4gfpfE4JyIzZ0zzcGcZAuTOlf3bHp6 ws4qBQNba817tu5KdusGU6FbGlH5ZuptAvDssJwqcjfLmr/sokodQUs0pjK7urp4ge VsGYr8ya+Lclxst3V4JGy0v9U2QRHDE8gX5TrwBbZ1nD6JioT3mBNr+fBO4hX/FTD9 lnjicovsg3z60eIj+QnXUVO0W18rKJWxJNtKU/oYFcjIxAZOkaxIRfp0WecRL8LGJF VEdKcCebNL3J4PCuBIzrIFPdE8FgPfBprr3f1fkE1jYDc3T1oTdZHGCCfAquW37SvT eqvuRXieVU9bw== Message-ID: <930797ecabdfe52d698bed64c6ebed0a1235a18b.camel@kernel.org> Subject: Re: Multigrain timestamps do not work on RISC-V From: Jeff Layton To: Andreas Schwab , linux-riscv@lists.infradead.org Cc: linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org Date: Wed, 29 Jan 2025 18:03:38 -0500 In-Reply-To: References: Autocrypt: addr=jlayton@kernel.org; prefer-encrypt=mutual; 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3.54.3 (3.54.3-1.fc41) MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20250129_150342_451551_08C1C59A X-CRM114-Status: GOOD ( 12.20 ) X-BeenThere: linux-riscv@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-riscv" Errors-To: linux-riscv-bounces+linux-riscv=archiver.kernel.org@lists.infradead.org On Wed, 2025-01-29 at 11:07 +0100, Andreas Schwab wrote: > The statx06 test in the LTP testsuite fails since the multigrain > timestamp feature was merged: > > https://openqa.opensuse.org/tests/4800409#step/statx06/7 > > The issue is that the nsec part of ctime does not change from the time > the file is created: > > $ touch xx > $ stat -c $'mtime %y\nctime %z' xx > mtime 2025-01-29 09:43:44.677442605 +0100 > ctime 2025-01-29 09:43:44.677442605 +0100 > $ touch xx > $ stat -c $'mtime %y\nctime %z' xx > mtime 2025-01-29 09:43:51.641581658 +0100 > ctime 2025-01-29 09:43:51.677442605 +0100 > > My guess would be that something in inode_set_ctime_current is going > wrong. > Thanks for the bug report, Andreas. I assume you're seeing this across different filesystems (i.e. tmpfs, ext4, etc.)? It almost looks like this try_cmpxchg() is returning true without actually doing the swap: if (try_cmpxchg(&inode->i_ctime_nsec, &cur, now.tv_nsec)) { /* If swap occurred, then we're (mostly) done */ inode->i_ctime_sec = now.tv_sec; trace_ctime_ns_xchg(inode, cns, now.tv_nsec, cur); mgtime_counter_inc(mg_ctime_swaps); } else { It might also be interesting to see the output of that tracepoint over this test, if you're able. Thanks, -- Jeff Layton _______________________________________________ linux-riscv mailing list linux-riscv@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-riscv