Messages in this thread | | | Date | Sun, 1 Dec 2019 20:55:21 +0100 | From | Ingo Molnar <> | Subject | Re: [PATCH] x86/pat: Fix off-by-one bugs in interval tree search |
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* Kenneth R. Crudup <kenny@panix.com> wrote:
> > On Sun, 1 Dec 2019, Ingo Molnar wrote: > > > So it would be nice if everyone who is seeing this bug could test the > > patch below against Linus's latest tree - does it fix the regression? > > The patch fixes the issue for me.
Great, thanks!
> > If not then please send the before/after dump of > > /sys/kernel/debug/x86/pat_memtype_list - and even if it works please send > > the dumps so we can double check it all. > > I don't have the "before patch" (but could if it is absolutely needed) but > here's the "after patch":
> uncached-minus @ 0xfed91000-0xfed92000 > uncached-minus @ 0xff340000-0xff341000 > write-combining @ 0x4000000000-0x4010000000 > uncached-minus @ 0x4010000000-0x4010001000
I believe this is the region that caused the problem, the 0x4010000000 'end' address of the WC region is the same as the 0x4010000000 'start' address of the UC- region that follows it.
> write-combining @ 0x604a800000-0x604b000000 > uncached-minus @ 0x604b100000-0x604b110000
This WC region was probably unaffected by the bug.
Thanks,
Ingo
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