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Date: Fri, 7 Apr 2017 16:45:26 +0200
From: Peter Zijlstra <>
To: Mathias Krause <>
Cc: Thomas Gleixner <>,
	Andy Lutomirski <>,
	Kees Cook <>,
	Andy Lutomirski <>,
	"" <>,
	Mark Rutland <>,
	Hoeun Ryu <>, PaX Team <>,
	Emese Revfy <>,
	Russell King <>, X86 ML <>,
	"" <>,
	"" <>
Subject: Re: Re: [RFC v2][PATCH 04/11] x86: Implement

On Fri, Apr 07, 2017 at 12:51:15PM +0200, Mathias Krause wrote:
> Why that? It allows fast and CPU local modifications of r/o memory.
> OTOH, an approach that needs to fiddle with page table entries
> requires global synchronization to keep the individual TLB states in
> sync. Hmm.. Not that fast, I'd say.

The fixmaps used for kmap_atomic are per-cpu, no global sync required.

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