tree 8912e1ebd7d665286e7bc28ec30688517835da87
parent a5ccfee05a439b803640e94584056204501db31c
author Li Zhong <zhong@linux.vnet.ibm.com> 1325958892 +0000
committer Benjamin Herrenschmidt <benh@kernel.crashing.org> 1326246626 +1100

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>