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 683D8C3ABBC for ; Fri, 9 May 2025 10:46:55 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:MIME-Version: Content-Transfer-Encoding:Content-Type: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=k54YIIAt1HX3qxqsLaJ9Pdr+Jyv+TK7yUdd/QX5Nw1g=; b=wcEj2raOM5xFrOQFDSqCgPy5Dm 0hRi6Nsqf6S/wF1aGV1G7NTrt7ti+taifhms8O0Oa6Qg4euAHa5wTKm9JMhwXwWSGeQtNy3cHH51E S4Tmr5b0M3+bfMh+Uk4ON/5x9Of454BuN4qIuwmYcOGqcOFIJTftppQ167XoBmoAlkdm9O7LhdnAG onNfIdHlTW2nKqt5DNZcK59d7nysLesVzl5dv4BfiM+q2rcILsM2rQjs2ZrhkjbBatatlAxanIJkP AZosGRtUr4mQyHCkzkHumumTu4wpcms0gt1aBpwQ8V6AKSJuQZE6i1ldNYjWmiOahrIa3AvbM/61P RCM22tAQ==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98.2 #2 (Red Hat Linux)) id 1uDLFl-00000003Kox-1Ciz; Fri, 09 May 2025 10:46:53 +0000 Received: from s3.sipsolutions.net ([2a01:4f8:242:246e::2] helo=sipsolutions.net) by bombadil.infradead.org with esmtps (Exim 4.98.2 #2 (Red Hat Linux)) id 1uDKZW-00000003CBa-1x85 for linux-um@lists.infradead.org; Fri, 09 May 2025 10:03:15 +0000 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=sipsolutions.net; s=mail; h=MIME-Version:Content-Transfer-Encoding: Content-Type:References:In-Reply-To:Date:Cc:To:From:Subject:Message-ID:Sender :Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From:Resent-To: Resent-Cc:Resent-Message-ID; bh=k54YIIAt1HX3qxqsLaJ9Pdr+Jyv+TK7yUdd/QX5Nw1g=; t=1746784992; x=1747994592; b=vPzg09k/u1lQD8FBNv8lz+A7mmXPdgZpnTZLaOgw4JLr21a diaK1F4V8W99yOIW5/rXAXYWpa8fx7TM35cmMB/pM2ow6SgyKPMBkv2B4/IA5i8wu5V9NRCpeQdKB KdyhCvtAc3soTaLBon3gbQ7lP0+1+3V819qVzynrQ2BPRb92VyDuJTy/Yu08RiXjZsQltq8Gu4H/4 KLf1T64xbYP+Un3WMbtGNlTQtwVJEBeooQR3qBl98D3h/2tfJ2Aoez5UNs2UMcJ5VdSL08WYlTK8j +10yL8HCLLN0nZN53CZaTKHj5zrb2QEYjPolQLhy1LTxyqOOSsvFSBECdVjqJm/w==; Received: by sipsolutions.net with esmtpsa (TLS1.3:ECDHE_X25519__RSA_PSS_RSAE_SHA256__AES_256_GCM:256) (Exim 4.98.1) (envelope-from ) id 1uDKZQ-0000000DFW4-1AvP; Fri, 09 May 2025 12:03:08 +0200 Message-ID: <05954e6dde3369a0ecf26f5225643afa15850f60.camel@sipsolutions.net> Subject: Re: [PATCH 6.12] Revert "um: work around sched_yield not yielding in time-travel mode" From: Johannes Berg To: Christian Lamparter , linux-kernel@vger.kernel.org, linux-um@lists.infradead.org Cc: benjamin.berg@intel.com, sashal@kernel.org, richard@nod.at, stable@vger.kernel.org Date: Fri, 09 May 2025 12:03:07 +0200 In-Reply-To: <20250509095040.33355-1-chunkeey@gmail.com> References: <20250509095040.33355-1-chunkeey@gmail.com> Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable User-Agent: Evolution 3.54.3 (3.54.3-1.fc41) MIME-Version: 1.0 X-malware-bazaar: not-scanned X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20250509_030314_786535_90C35F92 X-CRM114-Status: UNSURE ( 9.65 ) X-CRM114-Notice: Please train this message. X-BeenThere: linux-um@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-um" Errors-To: linux-um-bounces+linux-um=archiver.kernel.org@lists.infradead.org On Fri, 2025-05-09 at 11:50 +0200, Christian Lamparter wrote: >=20 > What's interessting/very strange strange about this time-travel stuff: > > commit 0b8b2668f998 ("um: insert scheduler ticks when userspace does no= t yield") >=20 > $ git describe 0b8b2668f998 > =3D> v6.12-rc2-43-g0b8b2668f998 > (from what I know this is 43 patches on top of v6.12-rc2 as per the man p= age: > "The command finds the most recent tag that is reachable from a commit. [= ...] > it suffixes the tag name with the number of additional commits on top of = the tagged > object and the abbreviated object name of the most recent commit." >=20 > But it was merged as part of: uml-for-linus-6.13-rc1 : > https://lore.kernel.org/lkml/1155823186.11802667.1732921581257.JavaMail.z= imbra@nod.at/ That's not all that implausible - UML maintenance is slow and we all have a lot of things to do... so chances are we just didn't send a pull request for 6.12-rc even though the tree was already there. I'm trying to improve that but it's not really a focus for any of us. johannes