Thanks. THis is what I needed to know. More changes and I will get it
up. I will post nwfs0329.tar.gz this evening -- a little more code
cleanup for 2.4 to do.
Jeff
"Stephen C. Tweedie" wrote:
>
> Hi,
>
> On Wed, Mar 29, 2000 at 04:51:39PM -0700, Jeff V. Merkey wrote:
> >
> > Do I need to also call lock_kernel() around calls to ll_rw_block() as
> > well (they seem to be SMP safe but thought I would ask)?
>
> Yes. The ll_rw_block stuff is SMP safe only with respect to completion
> of IOs. In other words, you can take device driver interrupts without
> the big lock, and ll_rw_block is properly threaded with respect to the
> interrupts.
>
> However, the submission of requests in the first place is currently
> always made with the big lock. ll_rw_block itself probably won't
> complain if you don't have it, but the device drivers assume that you
> already hold it so you don't want to risk changing that.
>
> --Stephen
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