linux-kernel - Re: [PATCH 5/9][v5] powerpc: implement is_instr_load

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Message-ID: <20131009012740.GB23780@concordia>
Date:	Wed, 9 Oct 2013 12:27:41 +1100
From:	Michael Ellerman <michael@...erman.id.au>
To:	Sukadev Bhattiprolu <sukadev@...ux.vnet.ibm.com>
Cc:	linux-kernel@...r.kernel.org,
	Stephane Eranian <eranian@...gle.com>, linuxppc-dev@...abs.org,
	Paul Mackerras <paulus@...ba.org>,
	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	Anshuman Khandual <khandual@...ux.vnet.ibm.com>
Subject: Re: [PATCH 5/9][v5] powerpc: implement is_instr_load_store().

On Wed, Oct 09, 2013 at 12:03:19PM +1100, Michael Ellerman wrote:
> On Tue, 2013-10-08 at 12:31 -0700, Sukadev Bhattiprolu wrote:
> > Michael Ellerman [michael@...erman.id.au] wrote:
> > | bool is_load_store(int ext_opcode)
> > | {
> > |         upper = ext_opcode >> 5;
> > |         lower = ext_opcode & 0x1f;
> > | 
> > |         /* Short circuit as many misses as we can */
> > |         if (lower < 3 || lower > 23)
> > |             return false;
> > 
> > I see some loads/stores like these which are not covered by
> > the above check. Is it ok to ignore them ?
> > 
> > 	lower == 29: ldepx, stdepx, eviddepx, evstddepx
> > 
> > 	lower == 31: lwepx, lbepx, lfdepx, stfdepx,
> 
> Those are the external process ID instructions, which I've never heard
> of anyone using, I think we can ignore them.
> 
> > Looking through the opcode maps, I also see these for primary
> > op code 4:
> > 
> > 	evldd, evlddx, evldwx, evldw, evldh, evldhx.
> > 
> > Should we include those also ?
> 
> Yes I think so. I didn't check any of the other opcodes for you.

Paul points out these are for the SPE extension, which we also don't
care about. So ignore those as well.

cheers
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