Re: [RFC PATCH] powerpc/mm/mce: Keep irq disabled during lockless page table walk
From: Michael Ellerman <hidden>
Date: 2019-09-20 08:38:11
On Wed, 2019-09-18 at 14:53:28 UTC, "Aneesh Kumar K.V" wrote:
__find_linux_mm_pte return a page table entry pointer walking the
page table without holding locks. To make it safe against a THP
split and collapse, we disable interrupts around the lockless
page table walk. We need to keep the interrupts disabled as long
as we use the page table entry pointer.
Cc: Balbir Singh <bsingharora@gmail.com>
Cc: Reza Arbab <redacted>
Cc: Santosh Sivaraj <redacted>
Fixes: ba41e1e1ccb9 ("powerpc/mce: Hookup derror (load/store) UE errors")
Signed-off-by: Aneesh Kumar K.V <redacted>Applied to powerpc next, thanks. https://git.kernel.org/powerpc/c/d9101bfa6adc831bda8836c4d774820553c14942 cheers