linux-kernel - Re: [PATCH v2 02/17] powerpc/cell: Move data segment faulting code out of cell platform

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Date:	Wed,  1 Oct 2014 16:47:57 +1000 (EST)
From:	Michael Ellerman <mpe@...erman.id.au>
To:	Michael Neuling <mikey@...ling.org>, greg@...ah.com, arnd@...db.de,
	mpe@...erman.id.au, benh@...nel.crashing.org
Cc:	mikey@...ling.org, anton@...ba.org, linux-kernel@...r.kernel.org,
	linuxppc-dev@...abs.org, jk@...abs.org, imunsie@...ibm.com,
	cbe-oss-dev@...ts.ozlabs.org,
	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>
Subject: Re: [PATCH v2 02/17] powerpc/cell: Move data segment faulting code out of cell platform

On Tue, 2014-30-09 at 10:34:51 UTC, Michael Neuling wrote:
> From: Ian Munsie <imunsie@....ibm.com>
> 
> __spu_trap_data_seg() currently contains code to determine the VSID and ESID
> required for a particular EA and mm struct.
> 
> This code is generically useful for other co-processors.  This moves the code
> of the cell platform so it can be used by other powerpc code.  It also adds 1TB
> segment handling which Cell didn't have.

I'm not loving this.

For starters the name "copro_data_segment()" doesn't contain any verbs, and it
doesn't tell me what it does.

If we give it a name that says what it does, we get copro_get_ea_esid_and_vsid().
Or something equally ugly.

And then in patch 10 you move the bulk of the logic into calculate_vsid().

So instead can we:
 - add a small helper that does the esid calculation, eg. calculate_esid() ?
 - factor out the vsid logic into a helper, calculate_vsid() ?
 - rework the spu code to use those, dropping __spu_trap_data_seg()
 - use the helpers in the cxl code


cheers
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