linux-kernel - Re: [PATCH 2/5] bitops: compile time optimization for hweight

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Message-ID: <4B7BF5D6.3030701@suse.cz>
Date:	Wed, 17 Feb 2010 14:57:42 +0100
From:	Michal Marek <mmarek@...e.cz>
To:	"H. Peter Anvin" <hpa@...or.com>, Borislav Petkov <bp@...64.org>
Cc:	linux-kbuild <linux-kbuild@...r.kernel.org>,
	Borislav Petkov <petkovbb@...glemail.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Wu Fengguang <fengguang.wu@...el.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Jamie Lokier <jamie@...reable.org>,
	Roland Dreier <rdreier@...co.com>,
	Al Viro <viro@...IV.linux.org.uk>,
	"linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>,
	Ingo Molnar <mingo@...e.hu>, Brian Gerst <brgerst@...il.com>
Subject: Re: [PATCH 2/5] bitops: compile time optimization for hweight_long(CONSTANT)

On 12.2.2010 20:05, H. Peter Anvin wrote:
> On 02/12/2010 09:47 AM, Borislav Petkov wrote:
>>
>> However, this is generic code and for the above to work we have to
>> enforce x86-specific CFLAGS for it. What is the preferred way to do
>> that?
>>
> 
> That's a question for Michal and the kbuild list.  Michal?

(I was offline last week).

The _preferred_ way probably is not to do it :), but otherwise you can
set CFLAGS_hweight.o depending on CONFIG_X86(_32|_64), just like you do
in arch/x86/lib/Makefile already.

Michal
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