linux-kernel - Re: [PATCH] [12/58] x86_64: Add vDSO for x86-64 with gettimeofday/clock

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Message-ID: <20070821184543.GK32640@bingen.suse.de>
Date:	Tue, 21 Aug 2007 20:45:43 +0200
From:	Andi Kleen <ak@...e.de>
To:	Daniel Walker <dwalker@...sta.com>
Cc:	Andi Kleen <ak@...e.de>, patches@...-64.org,
	linux-kernel@...r.kernel.org, akpm@...ux-foundation.org
Subject: Re: [PATCH] [12/58] x86_64: Add vDSO for x86-64 with gettimeofday/clock_gettime/getcpu

> In the -mm kernel there is some debugging that gets injected into the
> likely/unlikely macros .. If they get called from userspace it causes a

They should likely define a __likely()/__unlikely() then that doesn't
do this.

> hang .. We might want to add some new set of macros to specifically
> denote that they are called from userspace, not just likely/unlikely but
> all the macros so we don't get mixed usage ..

and add a hunk to change the vDSO code. Note that i386 is not the 
only architecture that has such code.

-Andi
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