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

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Message-ID: <CAJs94EaS5EQ=X9vRJzzApMuj9uiqH78Qq01HFNnRSXHNjeHRGw@mail.gmail.com>
Date:	Sun, 2 Nov 2014 11:46:09 +0400
From:	"Matwey V. Kornilov" <matwey.kornilov@...il.com>
To:	Alexander Graf <agraf@...e.de>
Cc:	Jonathan Corbet <corbet@....net>,
	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

I wish I knew. We need KBuild guru to ask how to take into account
host architecture.


2014-11-02 0:16 GMT+03:00 Alexander Graf <agraf@...e.de>:
>
>
> On 01.11.14 13:03, Matwey V. Kornilov wrote:
>> 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.
>
> Good point. Any ideas how I can easily limit this to x86 hosts?
>
>
> Alex



-- 
With best regards,
Matwey V. Kornilov
http://blog.matwey.name
xmpp://0x2207@...ber.ru
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