On 03/02, David Long wrote:
>
> Oleg,
>
> I've been looking at arch/Kconfig and kernel/trace/Kconfig where they
> deal with uprobes. The relevant items are CONFIG_UPROBES and
> CONFIG_UPROBE_EVENT. It just doesn't look right to me.
Yes, this looks strange. I never understood these dependencies. In fact
I even never tried. And I do not really understand kbuild, unfortunately...
>> --- a/arch/Kconfig
>> +++ b/arch/Kconfig
>> @@ -87,7 +87,8 @@ config KPROBES_ON_FTRACE
>>
>> config UPROBES
>> bool "Transparent user-space probes (EXPERIMENTAL)"
>> - depends on UPROBE_EVENT && PERF_EVENTS
>> + depends on ARCH_SUPPORTS_UPROBES
>> + depends on PERF_EVENTS
And why CONFIG_UPROBES should depend on PERF_EVENTS? uprobes can be
used by (say) systemtap without UPROBE_EVENT/PERF_EVENTS.
But as Russell pointed out the events directory is only built if
CONFIG_PERF_EVENTS=y, so it should depend on it or select...
I dunno. Personally I vote for the patch from Srikar in
http://article.gmane.org/gmane.linux.kernel/1017186
This is what we currently have, currently CONFIG_UPROBES is not
user-selectable anyway.
Oleg.
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