From: Li Zhong <zhong@linux.vnet.ibm.com>
Date: Sat, 7 Jan 2012 17:54:52 +0000 (+0000)
Subject: powerpc: Fix unpaired __trace_hcall_entry and __trace_hcall_exit
X-Git-Tag: v3.3-rc1~68^2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=ebb7f616abf6ee11603e6b63aa6c5f84c80a17d0;p=pandora-kernel.git

powerpc: Fix unpaired __trace_hcall_entry and __trace_hcall_exit

 Unpaired calling of __trace_hcall_entry and __trace_hcall_exit could
 cause incorrect preempt count. And it might happen as the global
 variable hcall_tracepoint_refcount is checked separately before calling
 them.

 Instead, store the value that was used on entry in the stack frame
 and retreive it from there after the call

Reported-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Signed-off-by: Li Zhong <zhong@linux.vnet.ibm.com>
Tested-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
---

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