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 <redacted>

__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