> I found that usb-uhci fails when FORCE_DEBUG is set in mm/slab.c
> because it expects 16 bytes alignment for structures it allocates.
And mm/slab.c changes semantics when CONFIG_SLAB_DEBUG
is set: it ignores SLAB_HWCACHE_ALIGN. That seems more like
the root cause of the problem to me!
It's a lot simpler to patch mm/slab.c so its semantics don't change.
That is, don't resolve clashes between HWCACHE_ALIGN and
automagic redzoning in favor of redzoning any more.
> I did not go all the way to using pci_alloc_single,
> pci_alloc_consistent and friends, because I am not too sure
> in my hand, and also because I believe in gradual change
> (in this case).
That big a patch is rather non-gradual ... :-)
I think that the pci_alloc_consistent patch that Johannes sent
by for "uhci.c" would be a better approach. Though I'd like
to see that be more general ... say, making mm/slab.c know
about such things. Add a simple abstraction, and that should
be it -- right? :-)
- Dave
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