Messages in this thread | | | Date | Tue, 24 Nov 2015 11:39:51 -0500 (EST) | From | Mikulas Patocka <> | Subject | Re: [GIT PULL] parisc huge page support for v4.4 |
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On Tue, 24 Nov 2015, Helge Deller wrote:
> > Hi > > > > Since the kernel 4.4-rc2 I'm getting frequent boot failures on PA-RISC. > > When I revert this patchset, the crashes are gone. > > > [ 3.296666] CPU(s): 4 out of 4 PA8900 (Shortfin) at 1000.000000 MHz online > > Hi Mikulas, > > Yes, I've seen this as well. > It affects only the PA8900 CPUs, while all PA8500-PA8700 machines seem to work fine. > I do have a temporary 3-line patch to avoid the crashes which I'll push to my tree shortly. > I'm still investigating why it only affects the PA8900 CPUs, but I assume > it's related to the cache aliasing of those CPUs. > I'll keep you updated. > > Helge
The PA-RISC specification doesn't allow aliasing on non-equaivalent addresses. Can the kernel map a piece of kernel data to other virtual address? If yes, we can't use big pages to map kernel data.
Mikulas
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