linux-kernel - Re: [PATCH] x86: drop REG_OUT macro from hweight functions

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Date:   Tue, 30 Jul 2019 06:42:51 -0700
From:   hpa@...or.com
To:     Peter Zijlstra <peterz@...radead.org>,
        Alexey Dobriyan <adobriyan@...il.com>
CC:     tglx@...utronix.de, mingo@...hat.com, bp@...en8.de, x86@...nel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] x86: drop REG_OUT macro from hweight functions

On July 30, 2019 1:08:43 AM PDT, Peter Zijlstra <peterz@...radead.org> wrote:
>On Mon, Jul 29, 2019 at 11:44:17PM +0300, Alexey Dobriyan wrote:
>> On Mon, Jul 29, 2019 at 12:04:47PM +0200, Peter Zijlstra wrote:
>> > +#define _ASM_ARG1B	__ASM_FORM_RAW(dil)
>> > +#define _ASM_ARG2B	__ASM_FORM_RAW(sil)
>> > +#define _ASM_ARG3B	__ASM_FORM_RAW(dl)
>> > +#define _ASM_ARG4B	__ASM_FORM_RAW(cl)
>> > +#define _ASM_ARG5B	__ASM_FORM_RAW(r8b)
>> > +#define _ASM_ARG6B	__ASM_FORM_RAW(r9b)
>> 
>> I preprocessed percpu code once to see what precisely it does because
>> it was easier than wading through forest of macroes.
>
>Per cpu is easy, try reading the tracepoint code ;-)

Sometimes it's the .s file one ends up wanting to check out...
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