metag: perf: fixes for interrupting perf counters

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The overflow handler needs to read modify write when re-enabling the
counter so as not to change the counter value as it may have been
changed to ready the next interrupt on overflow. Similarly for
interrupting counters metag_pmu_enable_counter needs to leave the
counter value unchanged rather than resetting it to zero.

Signed-off-by: James Hogan <james.hogan@imgtec.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Arnaldo Carvalho de Melo <acme@ghostprotocols.net>

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This commit is contained in:

James Hogan 2013-02-27 16:16:38 +00:00

parent c43ca04b5e

commit db59932f62

1 changed files with 15 additions and 7 deletions

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arch/metag/kernel/perf/perf_event.c

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