[PATCH 4.4 043/193] powerpc/perf: Fix oops when grouping different pmu events

4.4-stable review patch. If anyone has any objections, please let me know. -- From: Ravi Bangoria [ Upstream commit 5aa04b3eb6fca63d2e9827be656dcadc26d54e11 ] When user tries to group imc (In-Memory Collections) event with normal event,

[PATCH 4.4 043/193] powerpc/perf: Fix oops when grouping different pmu events

4.4-stable review patch. If anyone has any objections, please let me know. -- From: Ravi Bangoria [ Upstream commit 5aa04b3eb6fca63d2e9827be656dcadc26d54e11 ] When user tries to group imc (In-Memory Collections) event with normal event, (sometime) kernel crashes with