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authorMark Rutland <mark.rutland@arm.com>2014-05-13 19:08:19 +0100
committerWill Deacon <will.deacon@arm.com>2014-10-30 12:16:59 +0000
commita4560846eba60830a444d9e336c8a18f92e099ee (patch)
treec1f488dbcf522fd3a561f8fadf226d190d1c739d /arch/arm/kernel/perf_event.c
parent67b4305aab0fa993d91fa4c6ea2169cfb3f41c93 (diff)
downloadlinux-a4560846eba60830a444d9e336c8a18f92e099ee.tar.gz
arm: perf: limit size of accounting data
Commit 3fc2c83087 (ARM: perf: remove event limit from pmu_hw_events) got rid of the upper limit on the number of events an arm_pmu could handle, but introduced additional complexity and places a burden on each PMU driver to allocate accounting data somehow. So far this has not generally been useful as the only users of arm_pmu are the CPU backend and the CCI driver. Now that the CCI driver plugs into the perf subsystem directly, we can remove some of the complexities that get in the way of supporting heterogeneous CPU PMUs. This patch restores the original limits on pmu_hw_events fields such that the pmu_hw_events data can be allocated as a contiguous block. This will simplify dynamic pmu_hw_events allocation in later patches. Signed-off-by: Mark Rutland <mark.rutland@arm.com> Reviewed-by: Will Deacon <will.deacon@arm.com> Reviewed-by: Stephen Boyd <sboyd@codeaurora.org> Tested-by: Stephen Boyd <sboyd@codeaurora.org> Signed-off-by: Will Deacon <will.deacon@arm.com>
Diffstat (limited to 'arch/arm/kernel/perf_event.c')
-rw-r--r--arch/arm/kernel/perf_event.c4
1 files changed, 1 insertions, 3 deletions
diff --git a/arch/arm/kernel/perf_event.c b/arch/arm/kernel/perf_event.c
index 7ffb267fb628..864810713cfc 100644
--- a/arch/arm/kernel/perf_event.c
+++ b/arch/arm/kernel/perf_event.c
@@ -275,14 +275,12 @@ validate_group(struct perf_event *event)
{
struct perf_event *sibling, *leader = event->group_leader;
struct pmu_hw_events fake_pmu;
- DECLARE_BITMAP(fake_used_mask, ARMPMU_MAX_HWEVENTS);
/*
* Initialise the fake PMU. We only need to populate the
* used_mask for the purposes of validation.
*/
- memset(fake_used_mask, 0, sizeof(fake_used_mask));
- fake_pmu.used_mask = fake_used_mask;
+ memset(&fake_pmu.used_mask, 0, sizeof(fake_pmu.used_mask));
if (!validate_event(&fake_pmu, leader))
return -EINVAL;