fche changed the topic of #systemtap to: http://sourceware.org/systemtap; email systemtap@sourceware.org if answers here not timely, conversations may be logged
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<gpiccoli>
Hi, sorry to annoy. I'm getting an error message with systemtap, while instrumenting kernel v4.12
<gpiccoli>
error: implicit declaration of function ‘mmput’
<gpiccoli>
does anybody can help me understand what's going on ?
<gpiccoli>
[root@localhost systemtap]# cat /proc/kallsyms |grep -w mmput gives me "c0000000000e22d0 T mmput"
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<fche>
gpiccoli, try git systemtap against freshest kernels
<gpiccoli>
fche, trying that =)
<gpiccoli>
thanks!
<fche>
stap -V should give you a hint about what versions of the kernel it's been tested against
<fche>
since the kernel declines to provide a stable abi or api, kernel-module users like stap must constantly play catchup
<fche>
which we do, but can't travel back in time :)
<gpiccoli>
4.10
<gpiccoli>
I'm using 4.12
<gpiccoli>
fche, hehehe I got it
<gpiccoli>
It's really bummer
<gpiccoli>
I read something about a kernel ABI project
<gpiccoli>
hopefully it gets evolved
<fche>
the kernel ABI project I heard recently about was a systematization of the kernel-user (syscall interface) abi
<fche>
not intra-kernel
<fche>
:(
<gpiccoli>
ouch, was this one hehehe
<gpiccoli>
so, no lucky for systemtap hehehe
<gpiccoli>
hey fche, have some thoughts on this ?
<gpiccoli>
csclient.cxx:84:35: error: ‘_SC_CLK_TCK’ was not declared in this scope
<gpiccoli>
issue while building upstream systemta
<gpiccoli>
*stap
<fche>
hmmm, am sure we can fix that in a jiffy
<fche>
what distro are you using?
<gpiccoli>
I'm using RHEL 7.4 beta
<gpiccoli>
thanks fche !
<fche>
ok, should get back to you in not too long
<fche>
(an hour or less)
<gpiccoli>
ok, thanks fche =)
<gpiccoli>
fche, http://termbin.com/4m7i <= this fixed the build issue, not sure if it's the right solution hehehe
<gpiccoli>
Feel free to add it to code if you find it ok!
<fche>
thanks!
<gpiccoli>
fche, of course problems didn't stop! hehehe
<gpiccoli>
disagrees about version of symbol module_layout
<gpiccoli>
on dmesg
<gpiccoli>
Have a good idea to force version compatibilty?
<fche>
nope
<gpiccoli>
ok, tnx =)
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<fche>
hey gpiccoli btw what email address shall we credit that little #include patch with?
<fche>
re. module_layout
<gpiccoli>
hehehe thanks!
<gpiccoli>
will pm you
<fche>
that tends to happen iff the version of the compiler used to build the kernel with is very different from the system compiler version when stap's running
<fche>
that usually takes some doing, like custom $PATHs or something like that
<gpiccoli>
interesting, it was the same version fche
<gpiccoli>
I guess it might be related to MODVERSIONS
<gpiccoli>
I was able to circumvent it while running in distro kernel