From: Mahesh Salgaonkar <mahesh@linux.vnet.ibm.com>
Date: Wed, 30 Oct 2013 14:36:13 +0000 (+0530)
Subject: powerpc/powernv: Machine check exception handling.
X-Git-Tag: v3.14-rc1~80^2~52
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=b63a0ffe35de7e5f9b907bbc2c783e702f7e15af;p=pandora-kernel.git

powerpc/powernv: Machine check exception handling.

Add basic error handling in machine check exception handler.

- If MSR_RI isn't set, we can not recover.
- Check if disposition set to OpalMCE_DISPOSITION_RECOVERED.
- Check if address at fault is inside kernel address space, if not then send
  SIGBUS to process if we hit exception when in userspace.
- If address at fault is not provided then and if we get a synchronous machine
  check while in userspace then kill the task.

Signed-off-by: Mahesh Salgaonkar <mahesh@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
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