Jeff Garzik <[email protected]> writes:
> Attached is the patch and description that represents a current
> work-in-progress, removal of the 'irq' argument passed to all driver IRQ
> handlers.
>
> As this patch demonstrates, the 'irq' argument is useless and practically
> unused. The vast majority of drivers have this information elsewhere (struct
> pci_dev or private struct). The cases where it is actually used are as follows:
>
> * a couple Mac drivers have multiple IRQs, and use the irq argument for
> disambiguation purposes. This can easily be remedied by moving that information
> into the info passed in the normal void* pointer.
>
> * Several ancient ISA drivers, which mainly use it for printk-in-irq-handler
> purposes. A couple use the irq argument as an index into a structure, which is
> a buggy approach. I fixed up these.
>
> This can be found in the 'hacking-irq-remove' branch of
> git://git.kernel.org/pub/scm/linux/kernel/git/jgarzik/misc-2.6.git
>
>
> Before I will even consider submitting this upstream, this patchset needs
>
> * non-x86[-64] build fixes, and testing
> * update the Mac drivers
> * one more review pass, to make sure everything is kosher
>
> so IOW, not anytime soon :)
>
> Jeff Garzik (12):
> [irq-remove] Update core irq handling code to omit 'irq' parameter
> [irq-remove] update sound drivers for new irq handler function sig
> [irq-remove] update SCSI, ATA, IDE drivers for new irq handler function
> sig
> [irq-remove] update net drivers for new irq handler function sig
> driver irq handler arg removal: acorn, atm, block, bluetooth, cdrom
> driver irq handler arg removal: arch-specific code
> driver irq handler arg removal: acpi, char, dma, fc4
> driver irq handler arg removal: i2c, ieee1394, infiniband, input, isdn
> driver irq handler arg removal: macintosh, media, message, mfd, misc, mmc
> driver irq handler arg removal: serial, video
> driver irq handler arg removal: the rest
> irq-remove: build and warning fixes for 2.6.21
Looks reasonable to me. In my nefarious plans to make everything use
a struct irq pointer this would certainly help.
The get_irqfunc_irq() function to get the irq for the functions that
still need it looks like a very useful migration path.
Eric
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