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Date: Thu, 23 Jul 2020 16:26:23 +0200 From: Peter Zijlstra <peterz@...radead.org> To: Thomas Gleixner <tglx@...utronix.de> Cc: Alex Belits <abelits@...vell.com>, "frederic@...nel.org" <frederic@...nel.org>, "rostedt@...dmis.org" <rostedt@...dmis.org>, Prasun Kapoor <pkapoor@...vell.com>, "mingo@...nel.org" <mingo@...nel.org>, "davem@...emloft.net" <davem@...emloft.net>, "linux-api@...r.kernel.org" <linux-api@...r.kernel.org>, "linux-arch@...r.kernel.org" <linux-arch@...r.kernel.org>, "catalin.marinas@....com" <catalin.marinas@....com>, "will@...nel.org" <will@...nel.org>, "linux-arm-kernel@...ts.infradead.org" <linux-arm-kernel@...ts.infradead.org>, "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, "netdev@...r.kernel.org" <netdev@...r.kernel.org> Subject: Re: [PATCH v4 00/13] "Task_isolation" mode On Thu, Jul 23, 2020 at 03:17:04PM +0200, Thomas Gleixner wrote: > 2) Instruction synchronization > > Trying to do instruction synchronization delayed is a clear recipe > for hard to diagnose failures. Just because it blew not up in your > face does not make it correct in any way. It's broken by design and > violates _all_ rules of safe instruction patching and introduces a > complete trainwreck in x86 NMI processing. > > If you really think that this is correct, then please have at least > the courtesy to come up with a detailed and precise argumentation > why this is a valid approach. > > While writing that up you surely will find out why it is not. So delaying the sync_core() IPIs for kernel text patching _might_ be possible, but it very much wants to be a separate patchset and not something hidden inside a 'gem' like this.
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