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
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<irker167> systemtap: gpiccoli systemtap.git:refs/heads/master * release-3.1-122-g6b314d3 / csclient.cxx: fix _SC_CLK_TCK compile error on rhel7 http://tinyurl.com/yc8shcc6
<gpiccoli> cool =]
<gpiccoli> Thanks
<fche> modversions is a safety feature that should not require working around
<gpiccoli> hmm...it's weird
<fche> it should Just Work, with systemtap etc., unless something weird happened to the system compiler
<gpiccoli> I might be missing something then...
<fche> maybe you have some other version of cc in $PATH ?
<fche> or maybe your kernel-devel is of a different version than the running kernel?
<gpiccoli> letm e check
<gpiccoli> yes, it is
<fche> nah, it's a compile-time check
<gpiccoli> the kernel devel
<fche> got that working by any chance/
<gpiccoli> yeah, in distro kernel only fche
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