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Ian Rogers 3f5df3ac64 perf metric: Return early if no CPU PMU table exists 
Previous behavior is to segfault if there is no CPU PMU table and a
metric is sought. To reproduce compile with NO_JEVENTS=1 then request a
metric, for example, "perf stat -M IPC true".

Committer testing:

Before:

  $ make -k NO_JEVENTS=1 BUILD_BPF_SKEL=1 O=/tmp/build/perf-urgent -C tools/perf install-bin
  $ perf stat -M IPC true
  Segmentation fault (core dumped)
  $

After:

  $ perf stat -M IPC true

   Usage: perf stat [<options>] [<command>]

      -M, --metrics <metric/metric group list>
                            monitor specified metrics or metric groups (separated by ,)
  $

Fixes: 00facc7609 ("perf jevents: Switch build to use jevents.py")
Signed-off-by: Ian Rogers <irogers@google.com>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Caleb Biggers <caleb.biggers@intel.com>
Cc: Florian Fischer <florian.fischer@muhq.space>
Cc: Ian Rogers <rogers.email@gmail.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: James Clark <james.clark@arm.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: John Garry <john.garry@huawei.com>
Cc: Kan Liang <kan.liang@linux.intel.com>
Cc: Kshipra Bopardikar <kshipra.bopardikar@intel.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Miaoqian Lin <linmq006@gmail.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Perry Taylor <perry.taylor@intel.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Cc: Thomas Richter <tmricht@linux.ibm.com>
Cc: Xing Zhengjun <zhengjun.xing@linux.intel.com>
Link: https://lore.kernel.org/r/20220830164846.401143-3-irogers@google.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
2022-08-31 09:28:31 -03:00
..
accounting
arch tools kvm headers arm64: Update KVM header from the kernel sources 2022-08-27 11:55:16 -03:00
bootconfig
bpf bpftool: Complete libbfd feature detection 2022-08-10 10:44:01 -03:00
build tools build: Switch to new openssl API for test-libcrypto 2022-08-10 10:44:02 -03:00
certs
cgroup
counter
debugging
edid
firewire
firmware
gpio
hv
iio
include perf tools: Fix compile error for x86 2022-08-22 09:44:19 -07:00
io_uring
kvm/kvm_stat
laptop
leds
lib libperf: Add a test case for read formats 2022-08-19 15:56:44 -03:00
memory-model
objtool Misc fixes: 2022-08-28 10:10:23 -07:00
pci
pcmcia
perf perf metric: Return early if no CPU PMU table exists 2022-08-31 09:28:31 -03:00
power platform-drivers-x86 for v6.0-1 2022-08-04 18:19:14 -07:00
rcu
scripts
spi
testing Including fixes from ipsec and netfilter (with one broken Fixes tag). 2022-08-25 14:03:58 -07:00
thermal tools/thermal: Fix possible path truncations 2022-08-03 19:28:46 +02:00
time
tracing rtla: Consolidate and show all necessary libraries that failed for building 2022-08-10 12:03:02 -04:00
usb
verification rv/monitor: Add the wwnr monitor 2022-07-30 14:01:30 -04:00
virtio tools/virtio: fix build 2022-08-11 04:26:07 -04:00
vm - The usual batches of cleanups from Baoquan He, Muchun Song, Miaohe 2022-08-05 16:32:45 -07:00
wmi
Makefile