Re: [PATCH 5/5] libata/drivers: Add pata_macio, driver Apple PowerMac/PowerBook IDE controller
From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Date: 2009-12-03 23:56:36
Also in:
linux-ide
From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Date: 2009-12-03 23:56:36
Also in:
linux-ide
On Thu, 2009-12-03 at 03:12 -0500, Jeff Garzik wrote:
Looks fine to me. Two minor comments, which might perhaps be ignored if that is your taste: * prefer enums to #define's, for constants
yeah well ... I lifted those definitions from the old driver and didn't feel like changing them all :-) I might do a separate patch later to clean that up, we don't actually use a lot of those anymore since I use pre-calculated tables, though they are good to keep as documentation.
* prefer direct function call to "ap->ops->foo_bar()", because ap->ops->foo_bar() is guaranteed to be a constant value known to the driver. The driver is the entity responsible for the function pointer. Maybe saves a cycle or two. Not terribly important, but hey, calling ap->ops->sff_exec_command() from pata_macio_bmdma_setup() is a hot path.
Makes sense. I'm tempted to make that a separate patch tho, since I've already queued up the existing one and it's just a relatively minor performance optim. Cheers, Ben.