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SubjectRe: 2.4.5aa1
On Sat, May 26, 2001 at 06:35:43PM -0700, David S. Miller wrote:
> Andrea Arcangeli writes:
> > 00_eepro100-64bit-1
> >
> > Fixes a 64bit bug that was generating false positives and memory
> > corruption.
> >
> > (recommended)
> Good spotting, I've put this into my tree ;-)

fine, thanks!

> > 00_eepro100-alpha-1
> >
> > Possibly fix the eepro100 transmitter hang on alpha by doing atomic PIO
> > updates to avoid the clear_suspend to be lost.
> >
> > (recommended)
> The correct fix is to create {set,clear,change}_bit{8,16,32}()
> routines architectures may implement. The comment there in eepro100.c


> indicates the those defines are simply wrong for anything other than
> x86, not just Alpha.

The defines are ok but according to Matt they're not using atomic
operations, infact they works fine until you beat them hard. Infact I
guess it may trigger even in x86 in theory, I suspect it doesn't trigger
by luck, I think we should at least declare the __u16 pointer as
volatile or gcc may be free to do whatever it does on alpha without
using the bitops. The patch is actually using an #ifdef __alpha__
because it relys on the fact alpha internally does the 32bit accesses
with the bitops (so it doesn't mess with the other registers).

> > 00_ipv6-null-oops-1
> >
> > Fixes null pointer oops.
> >
> > (recommended)
> Please delete this, a proper fix is in 2.4.5, and in fact your
> added NULL test will never pass now :-)

I forgotten it, Alan noticed it too. thanks for the reminder.

> > 10_no-virtual-1
> >
> > Avoids wasting tons of memory if highmem is not selected (like
> > in all the 64bit ports).
> >
> > (nice to have)
> I experimented with computing the address every time on sparc64 and
> the performance actually went down slightly, it turned out it's
> quicker to load from an in-cache page struct member than compute the
> offset each time.

Ok, then I will add define_bool CONFIG_NO_PAGE_VIRTUAL y to sparc and

> It's probably not an issue on ix86, but who knows.

On modern x86 it should be faster to compute it to save dcache, memory
bandwith and ram.

Thanks for the review!

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