[PATCH v3 1/3] arm64/ras: support sea error recovery

On Thu, Sep 07, 2017 at 03:45:14PM +0800, Xie XiuQi wrote:

With ARM v8.2 RAS Extension, SEA are usually triggered when memory errors
are consumed. In some cases, if the error address is in a clean page or a
read-only page, there is a chance to recover. Such as error occurs in a
instruction page, we can reread this page from disk instead of killing
process.

Because memory_failure() may sleep, we can not call it directly in SEA
exception context. So we saved faulting physical address associated with
a process in the ghes handler and set __TIF_SEA_NOTIFY. When we return
from SEA exception context and get into do_notify_resume() before the
process running, we could check it and call memory_failure() to do
recovery. It's safe, because we are in process context.

Signed-off-by: Xie XiuQi <redacted>
Signed-off-by: Wang Xiongfeng <redacted>

This is not a correct SOB chain, please check:

Documentation/process/submitting-patches.rst, section 11.

---
 arch/arm64/Kconfig                   |  11 +++
 arch/arm64/include/asm/ras.h         |  36 +++++++++
 arch/arm64/include/asm/thread_info.h |   4 +-
 arch/arm64/kernel/Makefile           |   1 +
 arch/arm64/kernel/ras.c              | 141 +++++++++++++++++++++++++++++++++++
 arch/arm64/kernel/signal.c           |   8 ++
 arch/arm64/mm/fault.c                |  27 +++++--
 drivers/acpi/apei/ghes.c             |   4 +-
 8 files changed, 221 insertions(+), 11 deletions(-)
 create mode 100644 arch/arm64/include/asm/ras.h
 create mode 100644 arch/arm64/kernel/ras.c

What tree are those patches against?

They don't apply cleanly against latest mainline:

checking file arch/arm64/Kconfig
Hunk #1 succeeded at 641 (offset 1 line).
checking file arch/arm64/include/asm/ras.h
checking file arch/arm64/include/asm/thread_info.h
Hunk #1 FAILED at 86.
Hunk #2 succeeded at 98 (offset -4 lines).
Hunk #3 FAILED at 112.
2 out of 3 hunks FAILED
checking file arch/arm64/kernel/Makefile
checking file arch/arm64/kernel/ras.c
checking file arch/arm64/kernel/signal.c
Hunk #1 succeeded at 40 with fuzz 1 (offset 2 lines).
Hunk #2 FAILED at 750.
1 out of 2 hunks FAILED
checking file arch/arm64/mm/fault.c
Hunk #1 succeeded at 631 (offset 37 lines).
checking file drivers/acpi/apei/ghes.c

-- 
Regards/Gruss,
    Boris.

SUSE Linux GmbH, GF: Felix Imend?rffer, Jane Smithard, Graham Norton, HRB 21284 (AG N?rnberg)
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