]> git.proxmox.com Git - mirror_ubuntu-kernels.git/commit
powerpc/mm/mce: Keep irqs disabled during lockless page table walk
authorAneesh Kumar K.V <aneesh.kumar@linux.ibm.com>
Wed, 18 Sep 2019 14:53:28 +0000 (20:23 +0530)
committerMichael Ellerman <mpe@ellerman.id.au>
Thu, 19 Sep 2019 11:24:59 +0000 (21:24 +1000)
commitd9101bfa6adc831bda8836c4d774820553c14942
tree6ecb08a936eaf1af85eae2027ea0446407e53e07
parent7c1bb6bbf75d8ca5ec878627d3170effcaf54f27
powerpc/mm/mce: Keep irqs disabled during lockless page table walk

__find_linux_mm_pte() returns a page table entry pointer after walking
the page table without holding locks. To make it safe against a THP
split and/or collapse, we disable interrupts around the lockless page
table walk. However we need to keep interrupts disabled as long as we
use the page table entry pointer that is returned.

Fix addr_to_pfn() to do that.

Fixes: ba41e1e1ccb9 ("powerpc/mce: Hookup derror (load/store) UE errors")
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com>
[mpe: Rearrange code slightly and tweak change log wording]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20190918145328.28602-1-aneesh.kumar@linux.ibm.com
arch/powerpc/kernel/mce_power.c