linux-kernel - Re: [PATCH] x86-64: Prevent gcc from optimizing away venosys

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Message-ID: <20110603204847.GM27166@one.firstfloor.org>
Date:	Fri, 3 Jun 2011 22:48:47 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	Dave Anderson <anderson@...hat.com>
Cc:	linux-kernel@...r.kernel.org, mingo@...e.hu, andi@...stfloor.org,
	jstancek@...hat.com
Subject: Re: [PATCH] x86-64: Prevent gcc from optimizing away venosys_1()

>  	return 0;
>  }
>  
> -static long __vsyscall(3) venosys_1(void)
> +long __vsyscall(3) venosys_1(void)

Better add a __used too. Otherwise it can be optimized out again
in some builds e.g. when someone enables gc-sections for the linker.

-Andi
-- 
ak@...ux.intel.com -- Speaking for myself only.
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