Commit-ID: fc5fb2b5e1874e5894e2ac503bfb744220db89a1
Gitweb: http://git.kernel.org/tip/fc5fb2b5e1874e5894e2ac503bfb744220db89a1
Author: Robert Richter <[email protected]>
AuthorDate: Mon, 2 Apr 2012 20:19:17 +0200
Committer: Ingo Molnar <[email protected]>
CommitDate: Wed, 9 May 2012 15:23:16 +0200
perf/x86-ibs: Catch spurious interrupts after stopping IBS
After disabling IBS there could be still incomming NMIs with samples
that even have the valid bit cleared. Mark all this NMIs as handled to
avoid spurious interrupt messages.
Signed-off-by: Robert Richter <[email protected]>
Signed-off-by: Peter Zijlstra <[email protected]>
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Ingo Molnar <[email protected]>
---
arch/x86/kernel/cpu/perf_event_amd_ibs.c | 12 +++++++-----
1 files changed, 7 insertions(+), 5 deletions(-)
diff --git a/arch/x86/kernel/cpu/perf_event_amd_ibs.c b/arch/x86/kernel/cpu/perf_event_amd_ibs.c
index b14e711..5a9f95b 100644
--- a/arch/x86/kernel/cpu/perf_event_amd_ibs.c
+++ b/arch/x86/kernel/cpu/perf_event_amd_ibs.c
@@ -473,11 +473,13 @@ static int perf_ibs_handle_irq(struct perf_ibs *perf_ibs, struct pt_regs *iregs)
u64 *buf, *config, period;
if (!test_bit(IBS_STARTED, pcpu->state)) {
- /* Catch spurious interrupts after stopping IBS: */
- if (!test_and_clear_bit(IBS_STOPPING, pcpu->state))
- return 0;
- rdmsrl(perf_ibs->msr, *ibs_data.regs);
- return (*ibs_data.regs & perf_ibs->valid_mask) ? 1 : 0;
+ /*
+ * Catch spurious interrupts after stopping IBS: After
+ * disabling IBS there could be still incomming NMIs
+ * with samples that even have the valid bit cleared.
+ * Mark all this NMIs as handled.
+ */
+ return test_and_clear_bit(IBS_STOPPING, pcpu->state) ? 1 : 0;
}
msr = hwc->config_base;