Re: [PATCH V3] powerpc/thp: Serialize pmd clear against a linux page table walk.

2015-05-11 Thread Aneesh Kumar K.V
"Kirill A. Shutemov" writes: > On Mon, May 11, 2015 at 11:56:01AM +0530, Aneesh Kumar K.V wrote: >> Serialize against find_linux_pte_or_hugepte which does lock-less >> lookup in page tables with local interrupts disabled. For huge pages >> it casts pmd_t to pte_t. Since format of pte_t is differe

Re: [PATCH V3] powerpc/thp: Serialize pmd clear against a linux page table walk.

2015-05-11 Thread Kirill A. Shutemov
On Mon, May 11, 2015 at 11:56:01AM +0530, Aneesh Kumar K.V wrote: > Serialize against find_linux_pte_or_hugepte which does lock-less > lookup in page tables with local interrupts disabled. For huge pages > it casts pmd_t to pte_t. Since format of pte_t is different from > pmd_t we want to prevent t

[PATCH V3] powerpc/thp: Serialize pmd clear against a linux page table walk.

2015-05-10 Thread Aneesh Kumar K.V
Serialize against find_linux_pte_or_hugepte which does lock-less lookup in page tables with local interrupts disabled. For huge pages it casts pmd_t to pte_t. Since format of pte_t is different from pmd_t we want to prevent transit from pmd pointing to page table to pmd pointing to huge page (and b