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linux: automatically set CONFIG_PERF_EVENTS when perf is enabled 

Perf profiling cannot be used if CONFIG_PERF_EVENTS is not enabled in the
kernel configuration. Similar to other tools, like ktap, we can enable the
right options automatically.

Signed-off-by: Jan Heylen <jan.heylen@nokia.com>
Signed-off-by: Thomas De Schampheleire <thomas.de_schampheleire@nokia.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
2018.08.x
Jan Heylen 2018-07-04 09:07:35 +02:00 committed by Thomas Petazzoni
parent 3f4df8cd16
commit 63d76c6f2f
2 changed files with 7 additions and 3 deletions
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2
linux/linux.mk
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@ -292,6 +292,8 @@ define LINUX_KCONFIG_FIXUP_CMDS
$(call KCONFIG_ENABLE_OPT,CONFIG_ENABLE_DEFAULT_TRACERS,$(@D)/.config)
$(call KCONFIG_ENABLE_OPT,CONFIG_PERF_EVENTS,$(@D)/.config)
$(call KCONFIG_ENABLE_OPT,CONFIG_FUNCTION_TRACER,$(@D)/.config))
$(if $(BR2_PACKAGE_LINUX_TOOLS_PERF),
$(call KCONFIG_ENABLE_OPT,CONFIG_PERF_EVENTS,$(@D)/.config))
$(if $(BR2_PACKAGE_SYSTEMD),
$(call KCONFIG_ENABLE_OPT,CONFIG_CGROUPS,$(@D)/.config)
$(call KCONFIG_ENABLE_OPT,CONFIG_INOTIFY_USER,$(@D)/.config)

8
package/linux-tools/Config.in
View File

@ -47,9 +47,11 @@ config BR2_PACKAGE_LINUX_TOOLS_PERF
code), single CPU or severals threads.
This will build and install the userspace 'perf'
command. It is up to the user to ensure that the kernel
configuration has all the suitable options enabled to allow a
proper operation of 'perf'.
command.
Your kernel must have CONFIG_PERF_EVENTS enabled to use perf
profiling. Buildroot automatically enables this in the kernel
configuration.
https://perf.wiki.kernel.org/