linux-kernel - [PATCH] x86_64 : Suppress _

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Message-ID: <45FF06D1.3040405@cosmosbay.com>
Date:	Mon, 19 Mar 2007 22:55:29 +0100
From:	Eric Dumazet <dada1@...mosbay.com>
To:	Andi Kleen <ak@...e.de>
CC:	linux-kernel@...r.kernel.org, akpm@...ux-foundation.org
Subject: [PATCH] x86_64 : Suppress __jiffies

Hi Andi

I was considering re-submiting patch to group together 
xtime_lock/xtime/jiffies in the same cache line. Before doing so, I believe 
the following cleanup patch could prepare the x86_64 port to be similar with 
other arches.

Thank you

[PATCH] x86_64 : Suppress __jiffies

x86_64 arch currently specially defines __jiffies, as a relic of old vsyscall 
implementation. It is currently used to validate vgetcpu() user cache as a 
token. If we use another token, more opaque like the seqlock sequence, we can 
get rid of special __jiffies handling. As a result, jiffies_64 is no more 
included in vsyscall page. This patch prepares the introduction of time_data.

Signed-off-by: Eric Dumazet <dada1@...mosbay.com>

View attachment "no__jiffies.patch" of type "text/plain" (3288 bytes)