linux-kernel - Re: [patch 3/5] x86: headers cleanup

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Message-ID: <496F69C8.2040103@zytor.com>
Date:	Thu, 15 Jan 2009 08:52:24 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Cyrill Gorcunov <gorcunov@...il.com>
CC:	"Metzger, Markus T" <markus.t.metzger@...el.com>,
	"mingo@...e.hu" <mingo@...e.hu>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"harvey.harrison@...il.com" <harvey.harrison@...il.com>,
	"sam@...nborg.org" <sam@...nborg.org>,
	"jaswinderrajput@...il.com" <jaswinderrajput@...il.com>
Subject: Re: [patch 3/5] x86: headers cleanup - ptrace-abi.h

Cyrill Gorcunov wrote:
> 
> Hi Markus,
> 
> since it's supposed to be visible by userspace then we
> should just remove this CONFIG_X86_PTRACE_BTS so if userspace
> app has a reference to ptrace_bts_config but kernel in turn has
> this feature turned off -- the uerspace app shouldn't fail
> while being compiling.
> 

Well, for userspace, the kernel configuration doesn't matter: the
CONFIG_* macros *never* exist.

This would be yet another good reason why having them be always defined
and 0/1 instead would be such an improvement, but we're not there.

	-hpa

-- 
H. Peter Anvin, Intel Open Source Technology Center
I work for Intel.  I don't speak on their behalf.

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