linux-kernel - Re: [PATCH] x86_64: Work around old gas bug

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Message-Id: <506302EE020000780009DF72@nat28.tlf.novell.com>
Date:	Wed, 26 Sep 2012 12:28:14 +0100
From:	"Jan Beulich" <JBeulich@...e.com>
To:	"Ingo Molnar" <mingo@...nel.org>
Cc:	"Ingo Molnar" <mingo@...e.hu>, "Tao Guo" <glorioustao@...il.com>,
	<linux-kernel@...r.kernel.org>, <stable@...r.kernel.org>,
	<hpa@...or.com>
Subject: Re: [PATCH] x86_64: Work around old gas bug

>>> On 26.09.12 at 13:16, Ingo Molnar <mingo@...nel.org> wrote:

> * Jan Beulich <JBeulich@...e.com> wrote:
> 
>> >>> On 26.09.12 at 10:28, Tao Guo <glorioustao@...il.com> wrote:
>> > gas in binutils(2.16.91) could not parse parentheses within macro
>> > parameters unless fully parenthesized, and this is a workaround to
>> > make old gas work without generating below errors:
>> > arch/x86/kernel/entry_64.S: Assembler messages:
>> > arch/x86/kernel/entry_64.S:387: Error: too many positional arguments
>> > arch/x86/kernel/entry_64.S:389: Error: too many positional arguments
>> > arch/x86/kernel/entry_64.S:390: Error: too many positional arguments
>> > arch/x86/kernel/entry_64.S:391: Error: too many positional arguments
>> > arch/x86/kernel/entry_64.S:392: Error: too many positional arguments
>> > arch/x86/kernel/entry_64.S:393: Error: too many positional arguments
>> > arch/x86/kernel/entry_64.S:394: Error: too many positional arguments
>> > 
>> > Signed-off-by: Tao Guo <glorioustao@...il.com>
>> 
>> This looks okay now to me, but I'm somewhat reluctant to 
>> formally ack it given that we know how broken those particular 
>> gas versions are.
> 
> Well, assuming Tao Guo test-booted a kernel build with this old 
> GAS version, we could apply this patch on a best-effort basis - 
> the changes don't look particularly ugly. If other, unacceptable 
> uglies or fragilities come up then we might balk.
> 
> Agreed?

Fine with me.

Jan

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