[PATCH v2 0/3] arm64: Add support for handling memory corruption

Hi Manoj,

Manoj Iyer [off-list ref] writes:

On Wed, May 17, 2017 at 10:23 AM, Punit Agrawal
[off-list ref] wrote:

    Hi, This series enables memory failure handling for arm64.
    Previous posting can be found at [0]. Changes since v1: * Reworked
    Patch 1 based on Catalin's feedbak to symmetrically deal with PUD
    and PMD hugepages in huge_pte_offset() * Added Steve's acks With
    support for contiguous hugepages being turned off[1], some of the
    problems arising from swap entries go away[2]. This simplifies the
    changes needed to enable memory corruption handling for arm64
    (done in this seris). In this series, we updates huge_pte_offset()
    to correctly deal with swap entries (Patch 1). This function will
    need to be updated when contiguous hugepages are re-enabled. Patch
    2 adds support to send SIGBUS to processes that have their memory
    corrupted. With the prerequisites in place, enable memory
    corruption handling for arm64 (patch 3).

    Thanks, Punit [0]
    https://www.mail-archive.com/linux-kernel at vger.kernel.org/msg1376052.html
   [1] https://lkml.org/lkml/2017/4/7/486 [2]
    https://lkml.org/lkml/2017/4/5/402 Jonathan (Zhixiong) Zhang (2):
    arm64: hwpoison: add VM_FAULT_HWPOISON[_LARGE] handling arm64:
    kconfig: allow support for memory failure handling Punit Agrawal
    (1): arm64: hugetlb: Fix huge_pte_offset to return poisoned page
    table entries arch/arm64/Kconfig | 1 +
    arch/arm64/include/asm/pgtable.h | 2 +- arch/arm64/mm/fault.c | 22
    +++++++++++++++++++--- arch/arm64/mm/hugetlbpage.c | 29
    ++++++++++------------------- 4 files changed, 31 insertions(+),
    23 deletions(-) 
    -- 
    2.11.0 

I applied Jonathans 2 patches to Ubuntu Zesty kernel (4.10) and ran
the mce-test ./run_hugepage.sh after fixing a few things in the test
case. This generated the bad pmd messages.

linux-4.10.0/mm/pgtable-generic.c:33: bad pmd 0000000172420074.

Then I applied Punit's patch to the kernel and re-ran the mce-test and
did not see the bad pmd messages. The tests were done on a Qualcomm
Centriq 2400 platform. 

Tested-by: Manoj Iyer <redacted>

Thanks for taking the patches for a spin.