linux-kernel - Re: [PATCH] Documentation: Restrict TSC test code to x86

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Message-ID: <5454CC07.1070605@gmail.com>
Date:	Sat, 01 Nov 2014 15:03:19 +0300
From:	"Matwey V. Kornilov" <matwey.kornilov@...il.com>
To:	Alexander Graf <agraf@...e.de>, Jonathan Corbet <corbet@....net>
CC:	Peter Foley <pefoley2@...oley.com>,
	LKML <linux-kernel@...r.kernel.org>,
	"linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
	Jiri Kosina <jkosina@...e.cz>,
	Randy Dunlap <rdunlap@...radead.org>,
	"afaerber@...e.de" <afaerber@...e.de>
Subject: Re: [PATCH] Documentation: Restrict TSC test code to x86

28.10.2014 16:12, Alexander Graf пишет:
> 
> 
> 
>> Am 28.10.2014 um 13:47 schrieb Jonathan Corbet <corbet@....net>:
>>
>> On Mon, 27 Oct 2014 20:07:51 -0400
>> Peter Foley <pefoley2@...oley.com> wrote:
>>
>>>> The prctl test code in Documentation/ tries to show how to
>>>> use a call that only makes sense on x86. Restrict it there
>>>> so that other platforms don't try to call asm("rdtsc").
>>>>
>>>> Signed-off-by: Alexander Graf <agraf@...e.de>  
>>>
>>> Acked-by: Peter Foley <pefoley2@...oley.com>
>>
>> Snagged into the docs tree, thanks.
> 
> Awesome, please make sure this makes it into 3.18 - the build is broken on non-x86 archs there ;).
> 
> Alex
> 

Hi,

Sorry for criticism, but the patch is not complete.
CONFIG_X86 deals with target architecture, at the same time the problem
deals with the host architecture.

Imagine, that I run arm, aarch64 or something else and do
cross-compiling kernel for x86 on it. Then CONFIG_X86 will evaluate to
'y' and make will try to compile the apps with the host-compiler, which
is not x86 one.


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