linux-kernel - Re: [PATCH] Add a text

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Message-ID: <20131127222944.GB748@pd.tnic>
Date:	Wed, 27 Nov 2013 23:29:44 +0100
From:	Borislav Petkov <bp@...en8.de>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andy Lutomirski <luto@...capital.net>,
	Andi Kleen <andi@...stfloor.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...nel.org>,
	Andi Kleen <ak@...ux.intel.com>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH] Add a text_poke syscall v2

On Wed, Nov 27, 2013 at 02:25:29PM -0800, H. Peter Anvin wrote:
> Actually the CPUID is superfluous on anything than the executing CPU
> since IRET is serializing.

Why not on the executing core too? We're IRET-ting there too.

Which would mean that a dummy empty syscall would be enough too since we
need the serialization only.

-- 
Regards/Gruss,
    Boris.

Sent from a fat crate under my desk. Formatting is fine.
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