Re: possible virtual aliasing issues on parisc ?

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On Sun, Nov 4, 2012 at 4:29 PM, John David Anglin <dave.anglin@xxxxxxxx> wrote:
> I have the sense that this may fix
> http://thread.gmane.org/gmane.linux.ports.parisc/4027/focus=4278
> as I haven't seen the problem since I added the above change to my
> patch list.

I don't have parisc machines myself to test on; however if you could
confirm that this workload does cause arch_get_unmapped_area() to be
called with (flags & MAP_SHARED) set and (pgoff % 1024) != 0, I think
this would be a good enough smoking gun to blame the bug on this.

Regarding fixes: I'm going to try and send my vma gap finder patchset
this week for possible integration into andrew's -mm tree. There will
be one parisc patch in that set which will include the fix for this
coloring issue. Of course, feel free to apply James's minimal fix
before then; I am just sending this heads up as we're likely to end up
with a conflict between both fixes in -next if we go that way :)

-- 
Michel "Walken" Lespinasse
A program is never fully debugged until the last user dies.
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