From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 1D159442B15; Sat, 5 Sep 2026 16:40:33 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1788626435; cv=none; b=OFIb8VSM6OwJvaCKFqAGwvmoPxrL/R3RcEZ/utP2jqojeOql+xbZfUl3SWrEDJcnH5QiSFdPSp/3AzyAmT0yBchISTXrtujdQQJa90Des0qffw8ScPbeEIqGhhqcIwEr3isaawW2rJszk6zYsiVTxEptzt3Gc7dKqmeAvz+8JZo= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1788626435; c=relaxed/simple; bh=CnwYi+nWqq2lvtOdZx1n/m/eJZCP60TIKIMo3jjO8DY=; h=Date:Message-ID:From:To:Cc:Subject:In-Reply-To:References; b=idklj8vqioC+CNfLUxGOlfP35eJl3F70cMxqeisouZivN0grPtCMCMj5cRKrrVpWcjxU5Q7/lewnFp0/XtmZhGEK9nZIU5usmrisiSCdgIo3rzninQC2pEPCUb6IY0TNY0RyDZjC3k4NnOIJe2MqCGwwawysE9tJ/xvxjjzBkTc= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=G/woxpMD; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="G/woxpMD" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 91B8A1F00A3A; Sat, 5 Sep 2026 16:40:33 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1788626433; bh=CnwYi+nWqq2lvtOdZx1n/m/eJZCP60TIKIMo3jjO8DY=; h=Date:From:To:Cc:Subject:In-Reply-To:References; b=G/woxpMDhW24+seo+Mq4nGSI9FQfkD1IZEXjS8oN53LwnRUmSoXeb77J8YmnlAZXg GQoxUecZKWjrwy2tEFuPgvZmmC+eQvQkCVB0UKa49vGxEHgpM/8j8zK2ZrJlIQvlan m/cHbJ4I2rRRIYRl6wFcE/zspJOXaciH1yBPQFLvbfHdnZ/5tuCDmIg+iPg9kwAXTJ D4TckdrXeXpKT0B8ON9chjq2212E2BbgoXC+4W9XD8Nz9X7/ZjWsgRRQclwbkdNptD uIZwusOy1mThcIp2/9XcQ0SUsQ5uLS5Y4HN59VFgj/GOi9YgoAkxe4i1W2r8pAa2+W eEv/cUC3+MqZg== Date: Sat, 05 Sep 2026 06:40:32 -1000 Message-ID: From: Tejun Heo To: sashiko-bot@kernel.org Cc: David Vernet , Andrea Righi , Changwoo Min , sched-ext@lists.linux.dev, Emil Tsalapatis , linux-kernel@vger.kernel.org Subject: Re: [PATCH sched_ext/for-7.3-fixes 4/4] sched_ext: scx_qmap: Place only on cids whose caps are in effect In-Reply-To: <20260905162223.6EF521F00A3A@smtp.kernel.org> References: <20260905160958.1565156-1-tj@kernel.org> <20260905160958.1565156-5-tj@kernel.org> <20260905162223.6EF521F00A3A@smtp.kernel.org> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Hello, > This is a pre-existing issue, but can lockless readers observe a transiently > zeroed qa.self_cids.mask here and incorrectly fall through to the rescue block? Yes, but scx_qmap is an example scheduler and the result is a spurious rescue insert, which isn't critical. The race is acceptable. Thanks. -- tejun