linux-kernel - Re: [PATCH 1/3] x86/mm/pat: Disable preemption around __flush_tlb

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Message-ID: <20181017103926.okjwwinlsyegyrhu@linutronix.de>
Date:   Wed, 17 Oct 2018 12:39:27 +0200
From:   'Sebastian Andrzej Siewior' <bigeasy@...utronix.de>
To:     David Laight <David.Laight@...LAB.COM>
Cc:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "x86@...nel.org" <x86@...nel.org>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Andy Lutomirski <luto@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Borislav Petkov <bp@...en8.de>
Subject: Re: [PATCH 1/3] x86/mm/pat: Disable preemption around
 __flush_tlb_all()

On 2018-10-17 09:54:38 [+0000], David Laight wrote:
> Can it make any sense to flush the tlb with preemption enabled?
it might. Usually it is disabled for other reasons.

> Surely preemption must be disabled over something else as well?
In this case it is due to the CR3 reload. I don't see anything else.

> 	David

Sebastian