linux-kernel - Re: [PATCH 05/11] x86, fpu: add helper xfeature_nr_enabled() instead of test

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Message-ID: <20150828050457.GD25556@gmail.com>
Date:	Fri, 28 Aug 2015 07:04:57 +0200
From:	Ingo Molnar <mingo@...nel.org>
To:	Dave Hansen <dave@...1.net>
Cc:	dave.hansen@...ux.intel.com, mingo@...hat.com, x86@...nel.org,
	bp@...en8.de, fenghua.yu@...el.com, tim.c.chen@...ux.intel.com,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 05/11] x86, fpu: add helper xfeature_nr_enabled() instead
 of test_bit()


* Dave Hansen <dave@...1.net> wrote:

> 
> From: Dave Hansen <dave.hansen@...ux.intel.com>
> 
> We currently use test_bit() in a few places to see if an xfeature
> is enabled.  It ends up being a bit ugly because 'xfeatures_mask'
> is a u64 and test_bit wants an 'unsigned long' so it requires a
> cast.  The *_bit() functions are also techincally atomic, which
> we have no need for here.
> 
> So, remove the test_bit()s and replace with the new
> xfeature_nr_enabled() helper.

Small nit: please name it xfeature_enabled(), as it's shorter and already pretty 
unambiguous.

Thanks,

	Ingo
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