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SubjectRe: Preempt? (was Re: Cannot enable DMA on SATA drive (SCSI-libsata, VIA SATA))
Jeff Garzik <jgarzik@pobox.com> wrote:
>
> Andrew Morton wrote:
> > Jeff Garzik <jgarzik@pobox.com> wrote:
> >
> >>Preempt will always be something I ask people to turn off when reporting
> >> driver bugs; it just adds too much complicated mess for zero gain.
> >
> >
> > What driver bugs are apparent with preemption which are not already SMP bugs?
>
> If your implied answer is true, then we wouldn't need
> preempt_{en,dis}able() sprinkled throughout the code so much.
>

Where?

`grep -r preempt_disable drivers' points at one bodgy scsi driver.

`grep -r preempt_disable fs' finds two instances of per-cpu data.

`grep -r preempt_disable mm' finds three instances (wtf is vmalloc_to_page
trying to do? Looks redundant)

`grep -r preempt_disable ipc' is empty

`grep -r preempt_disable net' is empty

`grep -r preempt_disable include' gets a few.

It's less than I expected, actually.
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