From: Bharat Bhushan <r65777@freescale.com>
Date: Thu, 13 Oct 2011 09:47:08 +0000 (+0530)
Subject: PPC: Fix race in mtmsr paravirt implementation
X-Git-Tag: v3.4-rc1~59^2~101
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=f9208427f72e6cb52c71767af3bf8c14c43c27ac;p=pandora-kernel.git

PPC: Fix race in mtmsr paravirt implementation

The current implementation of mtmsr and mtmsrd are racy in that it does:

  * check (int_pending == 0)
  ---> host sets int_pending = 1 <---
  * write shared page
  * done

while instead we should check for int_pending after the shared page is written.

Signed-off-by: Bharat Bhushan <bharat.bhushan@freescale.com>
Signed-off-by: Alexander Graf <agraf@suse.de>
Signed-off-by: Avi Kivity <avi@redhat.com>
---

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