[lttng-dev] lttng patch 2.6.28 kprobe_mutex undeclared problem

[Paul Richardson]

Hi,

I'm trying to apply patch 'patch-2.6.28-lttng-0.85.tar.gz' to the standard linux kernel 2.6.28 taken directly from linux.org. I'm afraid it has to be kernel 2.6.28 and not a latter version.


1)      Whilst the patch applies OK using 'quilt push -a' when I go to build the kernel, first performing  a 'make xconfig' then a 'make uImage' I get the following build error:

arch/arm/kernel/kprobes.c: In function 'arch_remove_kprobe':
arch/arm/kernel/kprobes.c:95: error: 'kprobe_mutex' undeclared (first use in this function)
arch/arm/kernel/kprobes.c:95: error: (Each undeclared identifier is reported only once
arch/arm/kernel/kprobes.c:95: error: for each function it appears in.)
make[1]: *** [arch/arm/kernel/kprobes.o] Error 1
make: *** [arch/arm/kernel] Error 2

Is this known about and what is the fix for this?



2)      If I resolve this build error by:

i)                    Putting back the extern struct mutex kprobe_mutex in include/linux/kprobes.h

ii)                  Putting back the non-static declaration of kprobe_mutex in kernel/kprobes.c
Then build the kernel for arm-none-linux-gnueabi, it appears to build OK.
Then build and install ltt-control-0.63-03012009 for arm-none-linux-gnueabi and install on my arm development board.
Then build and install lttv-0.12.3-17122008 on my laptop.
When I run lttctl -C -w /tmp/trace1 trace1 on my arm dev board start a trace it appears to start. But when I run lttctl -D trace1 to stop the trace, the command seems to lock up and I have to ctrl C out of it. Looking at the trace1/ files, they are all 0 in size. I'm wondering if this lock up lttctl -D trace1 is related to how I resolved the kprobe problem?

Regards
Paul



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