-Restructure-Linux-PTE-on-Book3S-64-to-radix-format/20160220-143050
base: https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git next
config: powerpc-allmodconfig (attached as .config)
reproduce:
wget
https://git.kernel.org/cgit/linux/kernel/git/wfg/lkp-tests.git/plain/sbin
Paul Mackerras writes:
> On Sat, Feb 20, 2016 at 12:39:42PM +1100, Paul Mackerras wrote:
>> It seems there's something wrong with our transparent hugepage
>> implementation on POWER server processors as of v4.5-rc4. I have seen
>> the email thread on "[BUG] random kernel crashes after THP rework
Michael Ellerman writes:
> On Fri, 2016-02-19 at 11:23 +0530, Anshuman Khandual wrote:
>> On 02/18/2016 10:14 PM, Aneesh Kumar K.V wrote:
>> > We can get a hash pte fault with 4k base page size and find the pte
>> > already inserted with 64K base page size. In that case we need to clear
> ...
>>
Balbir Singh writes:
...
>> diff --git a/arch/powerpc/mm/hugepage-hash64.c
>> b/arch/powerpc/mm/hugepage-hash64.c
>> index 49b152b0f926..8424f46c2bf7 100644
>> --- a/arch/powerpc/mm/hugepage-hash64.c
>> +++ b/arch/powerpc/mm/hugepage-hash64.c
>> @@ -78,9 +78,14 @@ int __has
Paul Mackerras writes:
> This patch series modifies the Linux PTE format used on 64-bit Book3S
> processors (i.e. POWER server processors) to make the bits line up
> with the PTE format used in the radix trees defined in PowerISA v3.0.
> This will reduce the amount of further change required to m
We can get a hash pte fault with 4k base page size and find the pte
already inserted with 64K base page size. In that case we need to clear
the existing slot information from the old pte. Fix this correctly
With THP, we also clear the slot information with respect to all
the 64K hash pte mapping t
Anshuman Khandual writes:
> On 02/18/2016 10:14 PM, Aneesh Kumar K.V wrote:
>> We can get a hash pte fault with 4k base page size and find the pte
>> already inserted with 64K base page size. In that case we need to clear
>
> Can you please elaborate on this ? What are those situations when we
>
"Aneesh Kumar K.V" writes:
> Paul Mackerras writes:
>
>> This patch series modifies the Linux PTE format used on 64-bit Book3S
>> processors (i.e. POWER server processors) to make the bits line up
>> with the PTE format used in the radix trees defined in PowerISA v3.0.
>> This will reduce the am
Paul Mackerras writes:
> This frees up bits 57-63 in the Linux PTE on 64-bit Book 3S machines.
> In the 4k page case, this is done just by reducing the size of the
> RPN field to 39 bits, giving 51-bit real addresses. In the 64k page
> case, we had 10 unused bits in the middle of the PTE, so thi
Paul Mackerras writes:
> This changes the Linux page tables to store physical addresses
> rather than kernel virtual addresses in the upper levels of the
> tree (pgd, pud and pmd) for all 64-bit machines.
>
> This frees up some high order bits, and will be needed with book3s
> PowerISA v3.0 machi
Paul Mackerras writes:
> This changes _PAGE_PRESENT for 64-bit Book 3S processors from 0x2 to
> 0x8000___, because that is where PowerISA v3.0 CPUs in
> radix mode will expect to find it.
All the changes in this patch related to _PAGE_PRESENT movement or are
they cleanup that got add
Soft dirty bit support was only implemented for 64-bit Book3S, and
32-bit configurations currently fail to build.
Fixes: 7207f43665b8 ("powerpc/mm: Add page soft dirty tracking")
References:
https://buildd.debian.org/status/fetch.php?pkg=linux&arch=powerpc&ver=4.5%7Erc4-1%7Eexp1&stamp=1455791718
On Fri, 2016-02-19 at 08:10 +0530, Aneesh Kumar K.V wrote:
>
> I was hoping to do that after this series. Something similar to
>
> https://github.com/kvaneesh/linux/commit/0c2ac1328b678a6e187d1f2644a007204c59a047
>
> "
> powerpc/mm: Add helper for page flag access in ioremap_at
>
> Instead of u
Paul Mackerras writes:
> This moves the _PAGE_EXEC, _PAGE_RW and _PAGE_USER bits around in
> the Linux PTE on 64-bit Book 3S systems to correspond with the bit
> positions used in radix mode by PowerISA v3.0 CPUs. This also adds
> a _PAGE_READ bit corresponding to the read permission bit in the
"Aneesh Kumar K.V" writes:
> Paul Mackerras writes:
>
>> This patch series modifies the Linux PTE format used on 64-bit Book3S
>> processors (i.e. POWER server processors) to make the bits line up
>> with the PTE format used in the radix trees defined in PowerISA v3.0.
>> This will reduce the am
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