Masami Hiramatsu e9532d3261 perf probe: Fix to probe a function which has no entry pc ... [ Upstream commit 5d16dbcc31 ] Fix 'perf probe' to probe a function which has no entry pc or low pc but only has ranges attribute. probe_point_search_cb() uses dwarf_entrypc() to get the probe address, but that doesn't work for the function DIE which has only ranges attribute. Use die_entrypc() instead. Without this fix: # perf probe -k ../build-x86_64/vmlinux -D clear_tasks_mm_cpumask:0 Probe point 'clear_tasks_mm_cpumask' not found. Error: Failed to add events. With this: # perf probe -k ../build-x86_64/vmlinux -D clear_tasks_mm_cpumask:0 p:probe/clear_tasks_mm_cpumask clear_tasks_mm_cpumask+0 Committer testing: Before: [root@quaco ~]# perf probe clear_tasks_mm_cpumask:0 Probe point 'clear_tasks_mm_cpumask' not found. Error: Failed to add events. [root@quaco ~]# After: [root@quaco ~]# perf probe clear_tasks_mm_cpumask:0 Added new event: probe:clear_tasks_mm_cpumask (on clear_tasks_mm_cpumask) You can now use it in all perf tools, such as: perf record -e probe:clear_tasks_mm_cpumask -aR sleep 1 [root@quaco ~]# Using it with 'perf trace': [root@quaco ~]# perf trace -e probe:clear_tasks_mm_cpumask Doesn't seem to be used in x86_64: $ find . -name "*.c" | xargs grep clear_tasks_mm_cpumask ./kernel/cpu.c: * clear_tasks_mm_cpumask - Safely clear tasks' mm_cpumask for a CPU ./kernel/cpu.c:void clear_tasks_mm_cpumask(int cpu) ./arch/xtensa/kernel/smp.c: clear_tasks_mm_cpumask(cpu); ./arch/csky/kernel/smp.c: clear_tasks_mm_cpumask(cpu); ./arch/sh/kernel/smp.c: clear_tasks_mm_cpumask(cpu); ./arch/arm/kernel/smp.c: clear_tasks_mm_cpumask(cpu); ./arch/powerpc/mm/nohash/mmu_context.c: clear_tasks_mm_cpumask(cpu); $ find . -name "*.h" | xargs grep clear_tasks_mm_cpumask ./include/linux/cpu.h:void clear_tasks_mm_cpumask(int cpu); $ find . -name "*.S" | xargs grep clear_tasks_mm_cpumask $ Fixes: e1ecbbc3fa ("perf probe: Fix to handle optimized not-inlined functions") Reported-by: Arnaldo Carvalho de Melo <acme@kernel.org> Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com> Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org> Cc: Jiri Olsa <jolsa@redhat.com> Cc: Namhyung Kim <namhyung@kernel.org> Link: http://lore.kernel.org/lkml/157199319438.8075.4695576954550638618.stgit@devnote2 Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com> Signed-off-by: Sasha Levin <sashal@kernel.org>		2019-12-31 16:44:56 +01:00
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accounting
arch	x86/insn: Fix awk regexp warnings	2019-11-29 10:09:45 +01:00
bpf	tools: bpf: Use !building_out_of_srctree to determine srctree	2019-09-30 10:53:34 +02:00
build	tools build: Add capability-related feature detection	2019-08-12 17:14:14 -03:00
cgroup	iocost_monitor: Report debt	2019-09-10 12:31:39 -06:00
debugging
firewire
firmware
gpio	tools: gpio: Correctly add make dependencies for gpio_utils	2019-11-13 13:46:04 +01:00
hv	- First round of vmbus hibernation support from Dexuan Cui.	2019-09-24 12:36:31 -07:00
iio	tools: iio: add .gitignore	2019-08-18 20:45:57 +01:00
include	tools headers UAPI: Sync sched.h with the kernel	2019-10-15 12:44:00 -03:00
io_uring
kvm/kvm_stat
laptop
leds
lib	libsubcmd: Use -O0 with DEBUG=1	2019-12-31 16:44:56 +01:00
memory-model	tools/memory-model: Fix data race detection for unordered store and load	2019-12-31 16:43:40 +01:00
nfsd
objtool	ubsan, x86: Annotate and allow __ubsan_handle_shift_out_of_bounds() in uaccess regions	2019-12-31 16:44:25 +01:00
pci
pcmcia
perf	perf probe: Fix to probe a function which has no entry pc	2019-12-31 16:44:56 +01:00
power	tools/power/cpupower: Fix initializer override in hsw_ext_cstates	2019-12-31 16:43:26 +01:00
scripts
spi
testing	selftests/bpf: Make a copy of subtest name	2019-12-31 16:44:12 +01:00
thermal/tmon
time
usb	usbip: tools: fix fd leakage in the function of read_attr_usbip_status	2019-11-29 10:10:21 +01:00
virtio	tools/virtio: xen stub	2019-10-13 09:38:27 -04:00
vm
wmi
Makefile	tools: Keep list of tools in alphabetical order	2019-08-14 10:59:59 -03:00