linux-kernel - Re: [PATCH] x86: Clean up stack access code in irq

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Date:	Sun, 12 Oct 2014 10:13:33 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Chuck Ebbert <cebbert.lkml@...il.com>
CC:	Ingo Molnar <mingo@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>, x86@...nel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] x86: Clean up stack access code in irq_32.c

That's not a justification for change.  Claiming no harm is nevessary but not sufficient.

On October 12, 2014 9:53:32 AM PDT, Chuck Ebbert <cebbert.lkml@...il.com> wrote:
>On Sun, 12 Oct 2014 09:47:53 -0700
>"H. Peter Anvin" <hpa@...or.com> wrote:
>
>[replying to the list this time, sigh]
>
>> We changed this to asm because the C broke some compilers.  Why are
>you changing it back?
>> 
>
>The C broke some compilers because it was using a global register
>variable. This is a local one, which the clang documentation says is
>supported. And I compiled it with clang with no problem.
>
>> On October 12, 2014 9:43:53 AM PDT, Chuck Ebbert
><cebbert.lkml@...il.com> wrote:
>> >Use C instead of asm for accessing the stack pointer. And define
>some
>> >macros to make the code easier to understand.
>> >

-- 
Sent from my mobile phone.  Please pardon brevity and lack of formatting.
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