linux-kernel - Re: [RFC PATCH 3/3] x86/cpufeature: Remove unused and seldomly used cpu_has

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Message-ID: <20151127202339.GA3746@pd.tnic>
Date:	Fri, 27 Nov 2015 21:23:39 +0100
From:	Borislav Petkov <bp@...en8.de>
To:	Josh Triplett <josh@...htriplett.org>
Cc:	X86 ML <x86@...nel.org>, LKML <linux-kernel@...r.kernel.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Andy Lutomirski <luto@...capital.net>,
	Herbert Xu <herbert@...dor.apana.org.au>,
	Matt Mackall <mpm@...enic.com>, Chris Mason <clm@...com>,
	Josef Bacik <jbacik@...com>, David Sterba <dsterba@...e.com>,
	kbuild test robot <fengguang.wu@...el.com>
Subject: Re: [RFC PATCH 3/3] x86/cpufeature: Remove unused and seldomly used
 cpu_has_xx macros

On Fri, Nov 27, 2015 at 12:13:55PM -0800, Josh Triplett wrote:
> Given an appropriate long description for that config option, that seems
> worthwhile.  Something like this:
> 
> Some fast-paths in the kernel depend on the capabilities of the CPU.
> Say Y here for the kernel to patch in the appropriate code at runtime
> based on the capabilities of the CPU.  The infrastructure for patching
> code at runtime takes up some additional space; space-constrained
> embedded systems may wish to say N here to produce smaller, slightly
> slower code.

Thanks for the text, looks good and I'll use it. :)

And yes, considering the size of the patch, it is really worthwhile to
save ~1.6K kernel text that easily.

I'll do a proper patch and run it through the build tests.

Thanks.

-- 
Regards/Gruss,
    Boris.

ECO tip #101: Trim your mails when you reply.
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