From mboxrd@z Thu Jan 1 00:00:00 1970 Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.remote-ip=90.155.92.199 ARC-Seal: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; cv=none; t=1793891375; b=VEFnXAyxbmgCqQ5lwM3heDllZqoayJm857vF48tNB/94YTDne7p5whQVfzVgX1CvWWIJ AkSXDfZF1abmwuCBhUSv5zkoI7aGsnSL1CmamymJdU1E1U7TgcTHw+qUX+3+uxFOZGUTY EW9TKWz7RJ8woFsxg0Bn1jXBjubSnScIWW9gAsAMpJC8slArJUlqVQ4fuVKJs0GRpYvwR jwf3ogmMP9rJ90Y83X4lzMER14Pg0kXRgYvW9Qt1tn1DDVLg6aOmlphFlGkxA2FaXaMhm Jv/J3fhvvaVXAZk7gAuEPv9i0UKRLJw1D9lrp2uaNGu1xRd1i/1Z9g23/Z7wlVxgTKg== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1793891375; h=DMARC-Filter:DKIM-Signature:Received:Received:Date:From:To:Cc: Subject:Message-ID:References:MIME-Version:Content-Type: Content-Disposition:In-Reply-To; bh=TQMPLfLA6vid7ZD39lzJkwTV+Hp6CxAnwF9saCyhUJA=; b=N+S5ZwZY60A2k1dzju1nhlmFsUFXE9WPDmGLNTFIiTV3Umx9RKbY1+fYGtDfEGyBo/Ek hKy1cAjnmzyWU9J8IRoRRhLc2Vy83HMEHFio+DS5z8QKC+yf8onIl/vxqh+QXhXsdtwNP mJteCGYbj4iv7zzdPYUqojHc2ekFma0CDkqookEHR7Yq7pZhFIYVXsvbOD6aRkQR0ax/T G3GevrA76z/TuDJQO66RLDQltvL2y3+8A0fq1xugFVgRBjJ9dSiTdZ7TQWIJOd+Du4kSN /2xhb4fftFYpldMZzFJtsmp5QvfpOdyfdpJCgKOkCfY82B0jSsshdnm9JdIwVz7SsSw== ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass header.from=infradead.org; spf=pass smtp.mailfrom=infradead.org; dkim=pass header.d=infradead.org header.i=@infradead.org header.a=rsa-sha256 header.s=desiato.20200630 header.b=eXGyKZjM; arc=none smtp.remote-ip=90.155.92.199 Received: from desiato.infradead.org (desiato.infradead.org [90.155.92.199]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (prime256v1) server-digest SHA256) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 3F3DC606D803 for ; Thu, 5 Nov 2026 15:09:34 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.2 smtp.subspace.kernel.org 3F3DC606D803 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=infradead.org Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=infradead.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key, unprotected) header.d=infradead.org header.i=@infradead.org header.a=rsa-sha256 header.s=desiato.20200630 header.b=eXGyKZjM DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=desiato.20200630; h=In-Reply-To:Content-Type:MIME-Version: References:Message-ID:Subject:Cc:To:From:Date:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=TQMPLfLA6vid7ZD39lzJkwTV+Hp6CxAnwF9saCyhUJA=; b=eXGyKZjMuc52IK8ezrkNEZVwPU fKp1zVhsu42hqLfZH1tvD4vxdC2hDy+7r35fvMlnw2rcPpkZ9YXzHFhDyeUBnjtMmov9jX1eBo3bF uloABgO/ylYxBLfOzkLjvqJg2Ukx6HKvsjFWKu/QgqjQYab5Q6LIocKDBTPMgFItd81wBh6d3DYGh tQPTJLFkpdR3IJXPUahmzkHVNUHE6tgf2GLXYJHH2jMUHvoulpG93vRgW+/UCHA9sme3SJPfRtIxJ RVrCJmRfoVaPBe8W8PaFsplGSms23lIwCbZaHAuouyNNpGnzbw3TGXKg8srfhqZJIxaDhnAyUHVU7 AdGT5kqg==; Received: from 77-249-17-252.cable.dynamic.v4.ziggo.nl ([77.249.17.252] helo=noisy.programming.kicks-ass.net) by desiato.infradead.org with esmtpsa (Exim 4.100.1 #2 (Red Hat Linux)) id 1xOz5g-000000037xr-0BUW; Thu, 05 Nov 2026 15:09:24 +0000 Received: by noisy.programming.kicks-ass.net (Postfix, from userid 1000) id 73FC1300399; Thu, 05 Nov 2026 16:09:22 +0100 (CET) Date: Thu, 5 Nov 2026 16:09:22 +0100 From: Peter Zijlstra To: Seiji Nishikawa Cc: Thomas Gleixner , Ingo Molnar , Juri Lelli , Vincent Guittot , Dietmar Eggemann , Steven Rostedt , Ben Segall , Mel Gorman , Valentin Schneider , K Prateek Nayak , Josh Don , linux-kernel@vger.kernel.org, syzbot+681e729b2cf0d4860042@syzkaller.appspotmail.com, syzkaller-bugs@googlegroups.com, Ahmed Abdelraoof Subject: Re: [PATCH RESEND] sched/core: Do not touch SMT siblings that have not joined the core yet Message-ID: <20261105150922.GR1813469@noisy.programming.kicks-ass.net> References: <20261105101018.GM1813469@noisy.programming.kicks-ass.net> <20261105134035.170438-1-snishika@redhat.com> X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20261105134035.170438-1-snishika@redhat.com> On Thu, Nov 05, 2026 at 10:40:35PM +0900, Seiji Nishikawa wrote: > On Thu, Nov 05, 2026 at 11:10:18AM +0100, Peter Zijlstra wrote: > > Of the two, I like your better for being more consistent -- but you're > > doing the same thing 4 times, which does beg the question if we cannot > > wrap that nicer. > > > > How about so then? > > Thanks, this looks nicer. > > I tested it on v7.4-rc1 with the syzbot C reproducer. The warning did > not trigger in about 1250 seconds (about 6100 offline/online cycles of > CPU 1). > > Should I send a v2 with this change, or will you apply it yourself? I have it; if only 0-day would hurry up with the current batch of sched/urgent patches :/