Messages in this thread Patch in this message | | | From | Alexander Shishkin <> | Subject | [PATCH RFC v1 4/4] perf/x86: Annotate some of the error codes with perf_err() | Date | Fri, 24 Jul 2015 14:45:59 +0300 |
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This patch annotates a few x86-specific error paths with perf's extended error reporting facility.
NYet-Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com> --- arch/x86/kernel/cpu/perf_event.c | 8 ++++++-- arch/x86/kernel/cpu/perf_event_intel_lbr.c | 2 +- 2 files changed, 7 insertions(+), 3 deletions(-)
diff --git a/arch/x86/kernel/cpu/perf_event.c b/arch/x86/kernel/cpu/perf_event.c index 3658de4790..2b22e57100 100644 --- a/arch/x86/kernel/cpu/perf_event.c +++ b/arch/x86/kernel/cpu/perf_event.c @@ -12,6 +12,8 @@ * For licencing details see kernel-base/COPYING */ +#define PERF_MODNAME "perf/x86" + #include <linux/perf_event.h> #include <linux/capability.h> #include <linux/notifier.h> @@ -426,11 +428,13 @@ int x86_setup_perfctr(struct perf_event *event) /* BTS is currently only allowed for user-mode. */ if (!attr->exclude_kernel) - return -EOPNOTSUPP; + return perf_err(-EOPNOTSUPP, + "BTS sampling not allowed for kernel space"); /* disallow bts if conflicting events are present */ if (x86_add_exclusive(x86_lbr_exclusive_lbr)) - return -EBUSY; + return perf_err(-EBUSY, + "LBR conflicts with active events"); event->destroy = hw_perf_lbr_event_destroy; } diff --git a/arch/x86/kernel/cpu/perf_event_intel_lbr.c b/arch/x86/kernel/cpu/perf_event_intel_lbr.c index 452a7bd2de..b004fb310f 100644 --- a/arch/x86/kernel/cpu/perf_event_intel_lbr.c +++ b/arch/x86/kernel/cpu/perf_event_intel_lbr.c @@ -577,7 +577,7 @@ int intel_pmu_setup_lbr_filter(struct perf_event *event) * no LBR on this PMU */ if (!x86_pmu.lbr_nr) - return -EOPNOTSUPP; + return perf_err(-EOPNOTSUPP, "LBR is not supported by this cpu"); /* * setup SW LBR filter -- 2.1.4
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