Date: Thu, 6 Nov 2008 22:25:40 +0100
From: Ingo Molnar <mingo@elte.hu>
To: Ken Chen <kenchen@google.com>
Cc: Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: [patch] enable wchan config menu item for x86-64
Message-ID: <20081106212540.GE24579@elte.hu>
References: <b040c32a0811061110g69b6cc6cta88774b72e5b9163@mail.gmail.com>
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* Ken Chen <kenchen@google.com> wrote:

> Ingo,
> 
> I don't know when will you phase out /proc/pid/wchan.  Can we enable the
> wchan config menu item for now on x86-64 arch?  This will at least allow
> people to enable/disable frame pointers on scheduler functions.
> 
> Signed-off-by: Ken Chen <kenchen@google.com>
> 
> diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
> index e60c59b..38f9fb9 100644
> --- a/arch/x86/Kconfig
> +++ b/arch/x86/Kconfig
> @@ -367,7 +367,7 @@ config X86_RDC321X
>  config SCHED_NO_NO_OMIT_FRAME_POINTER
>  	def_bool y
>  	prompt "Single-depth WCHAN output"
> -	depends on X86_32
> +	depends on X86

makes sense, i've added it to tip/sched/core, thanks Ken!

This will need some testing as we never did this on 64-bit, so it's 
definitely a v2.6.29 item.

	Ingo
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