powerpc/mce: hookup memory_failure for UE errors

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If we are in user space and hit a UE error, we now have the
basic infrastructure to walk the page tables and find out
the effective address that was accessed, since the DAR
is not valid.

We use a work_queue content to hookup the bad pfn, any
other context causes problems, since memory_failure itself
can call into schedule() via lru_drain_ bits.

We could probably poison the struct page to avoid a race
between detection and taking corrective action.

Signed-off-by: Balbir Singh <bsingharora@gmail.com>
Reviewed-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

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Balbir Singh 2017-09-29 14:26:55 +10:00 • committed by Michael Ellerman

parent 01eaac2b05

commit 733e4a4c44

1 changed files with 67 additions and 3 deletions

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arch/powerpc/kernel/mce.c

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