linux-kernel - Re: [PATCH 2/3] powerpc: fix build errors

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Date:   Thu, 24 Feb 2022 11:37:13 -0600
From:   Segher Boessenkool <segher@...nel.crashing.org>
To:     Michael Ellerman <mpe@...erman.id.au>
Cc:     Anders Roxell <anders.roxell@...aro.org>,
        Arnd Bergmann <arnd@...db.de>, linuxppc-dev@...ts.ozlabs.org,
        linux-kernel@...r.kernel.org, stable@...r.kernel.org
Subject: Re: [PATCH 2/3] powerpc: fix build errors

On Thu, Feb 24, 2022 at 11:39:16PM +1100, Michael Ellerman wrote:
> >  	/* Calculate the parity of the value */
> > -	asm ("popcntd %0,%1" : "=r" (parity) : "r" (val));
> > +	asm (".machine \"push\"\n"
> > +	     ".machine \"power7\"\n"
> > +	     "popcntd %0,%1\n"
> > +	     ".machine \"pop\"\n"
> > +	     : "=r" (parity) : "r" (val));
> 
> This was actually present in an older CPU, but it doesn't really matter,
> this is fine.

popcntd was new on p7 (popcntb is the older one :-) )  And it does not
matter indeed.


Segher