From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from relay.hostedemail.com (smtprelay0013.hostedemail.com [216.40.44.13]) (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 C5E7DAD24 for ; Tue, 8 Jul 2025 02:05:34 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=216.40.44.13 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1751940336; cv=none; b=SA7ToDrI/YIKnUNGhJHjJxNfTVVLUDt8ktVcBsgkytCJW7Ve2SOFoSrUTeoQYdwsdYHdw3G8FRn35u8u8BSeeWtZf0S6QH0lFJGmX8VI1a+LdI7Vwcvsr6tCJlYELzL63nimsBro3xKuqS1wSYc80N8WAi69+Jy38eQVvjTN4Qg= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1751940336; c=relaxed/simple; bh=Ukf1beu7Z3UgIce3RxpuEdhnGAGC4GPRQ4/as7Tr5n8=; h=Date:From:To:Cc:Subject:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=KOTTcSwfe+dI9AOOTUeaHRjQjrzRHJPVnabtSHMn5tkE+jXJ8lx9zcvC1s7WD6e7limmBlMr7T3S+7SQn/nBSB1bn0mQnSZJmSneKCg5RLP9FIsl5slIyro6i7wi6TlEvmwmCuZoHYHhIJsjKWbg0kQHz9xz3fsermobaqWKxgc= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=goodmis.org; spf=pass smtp.mailfrom=goodmis.org; arc=none smtp.client-ip=216.40.44.13 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=goodmis.org Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=goodmis.org Received: from omf03.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay08.hostedemail.com (Postfix) with ESMTP id E15F2140432; Tue, 8 Jul 2025 02:05:32 +0000 (UTC) Received: from [HIDDEN] (Authenticated sender: rostedt@goodmis.org) by omf03.hostedemail.com (Postfix) with ESMTPA id 1C7896000E; Tue, 8 Jul 2025 02:05:30 +0000 (UTC) Date: Mon, 7 Jul 2025 22:05:29 -0400 From: Steven Rostedt To: "Li,Rongqing" Cc: Oleg Nesterov , Peter Zijlstra , David Laight , "linux-kernel@vger.kernel.org" , "vschneid@redhat.com" , "mgorman@suse.de" , "bsegall@google.com" , "dietmar.eggemann@arm.com" , "vincent.guittot@linaro.org" , "juri.lelli@redhat.com" , "mingo@redhat.com" Subject: Re: [????] Re: [????] Re: divide error in x86 and cputime Message-ID: <20250707220529.19eb2a74@gandalf.local.home> In-Reply-To: <8f68278c4a454fd79b39cf21d4c0974f@baidu.com> References: <78a0d7bb20504c0884d474868eccd858@baidu.com> <20250707220937.GA15787@redhat.com> <20250707182056.66a8468a@gandalf.local.home> <20250707183331.029570bf@gandalf.local.home> <42f5344b80e244278aaf49f112498e02@baidu.com> <20250707215322.0e4ec431@gandalf.local.home> <8f68278c4a454fd79b39cf21d4c0974f@baidu.com> X-Mailer: Claws Mail 3.20.0git84 (GTK+ 2.24.33; x86_64-pc-linux-gnu) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-Stat-Signature: s5by4ubu7duxsdjpudwz18qfq1m5syxi X-Rspamd-Server: rspamout04 X-Rspamd-Queue-Id: 1C7896000E X-Session-Marker: 726F737465647440676F6F646D69732E6F7267 X-Session-ID: U2FsdGVkX1/7fN3hVUYdnIa3GgXFj31T9pP/1uCYdaQ= X-HE-Tag: 1751940330-595184 X-HE-Meta: U2FsdGVkX18BPjX5oYCZjuhPZiAZYUoSEBP5S89BGjs8qpH4s2P97XTYXWCUPThWZqtYwav53thOeZPA6seUqcb8ByEpbhsHVbJCcDqRqPCEDjCdWsRYOpBtA5s8i2Pk1Hil52lHKjZMeui75HMBUBzGfSwuvn66IlJavWt8pRaA2JC75BL0mj3c9A/qbqB/lKlqqpiCaThA5+pugELaVBngJz4WAnfjTqF5EA37kPeNKJTWT4B/PuRCM3F6i8wwb15+cfM1iq1xLYIIOObs26bSYlKH5Sh+27Q/5wgsnCduKyTDoaVzuvrErfDNVXyUPaLvOtkl59YanEfLy05MAaeBZl7lEN4d9Od8+zl58SKbn3qBOS+VFg== On Tue, 8 Jul 2025 01:58:00 +0000 "Li,Rongqing" wrote: > But mul_u64_u64_div_u64() for x86 should not trigger a division error panic, maybe should return a ULLONG_MAX on #DE (like non-x86 mul_u64_u64_div_u64(),) Perhaps. But it is still producing garbage. -- Steve