linux-kernel - Re: [PATCH v2] x86/lib/copy_user_64.S: Handle 4-byte nocache copy

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Message-ID: <20160209120816.GC500@gmail.com>
Date:	Tue, 9 Feb 2016 13:08:16 +0100
From:	Ingo Molnar <mingo@...nel.org>
To:	Borislav Petkov <bp@...e.de>
Cc:	Toshi Kani <toshi.kani@....com>, tglx@...utronix.de,
	mingo@...hat.com, hpa@...or.com, dan.j.williams@...el.com,
	ross.zwisler@...ux.intel.com, vishal.l.verma@...el.com,
	micah.parrish@....com, brian.boylston@....com, x86@...nel.org,
	linux-nvdimm@...ts.01.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] x86/lib/copy_user_64.S: Handle 4-byte nocache copy


* Borislav Petkov <bp@...e.de> wrote:

> On Tue, Feb 09, 2016 at 12:27:32PM +0100, Ingo Molnar wrote:
> > Btw., IIRC GAS is being silly about .L, i.e. there's a difference between these 
> > two variants:
> > 
> >  .Lerror_entry_from_usermode_swapgs:
> >  .L_error_entry_from_usermode_swapgs:
> > 
> > the latter would be easier to read, but does not result in a local label last I 
> > checked.
> > 
> > Right?
> 
> Seems to build ok here with "GNU assembler (GNU Binutils) 2.26.51.20151207".
> Perhaps some bug with older gas...?

Hm, indeed - I just tried it too.

This means that the (slightly) more readable .L_ prefix is preferred.

Thanks,

	Ingo