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SubjectRe: kernel//trace/fgraph.c:111:35: error: 'MCOUNT_INSN_SIZE' undeclared; did you mean 'UCOUNT_COUNTS'?
On Thu, 2 Jan 2020 02:09:22 +0800
kbuild test robot <lkp@intel.com> wrote:

> tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
> head: 738d2902773e30939a982c8df7a7f94293659810
> commit: ff205766dbbee024a4a716638868d98ffb17748a ftrace: Fix function_graph tracer interaction with BPF trampoline
> date: 3 weeks ago
> config: riscv-randconfig-a001-20200102 (attached as .config)
> compiler: riscv64-linux-gcc (GCC) 7.5.0
> reproduce:
> wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
> chmod +x ~/bin/make.cross
> git checkout ff205766dbbee024a4a716638868d98ffb17748a
> # save the attached .config to linux build tree
> GCC_VERSION=7.5.0 make.cross ARCH=riscv
>
> If you fix the issue, kindly add following tag
> Reported-by: kbuild test robot <lkp@intel.com>
>
> All errors (new ones prefixed by >>):
>
> kernel//trace/fgraph.c: In function 'function_graph_enter':
> >> kernel//trace/fgraph.c:111:35: error: 'MCOUNT_INSN_SIZE' undeclared (first use in this function); did you mean 'UCOUNT_COUNTS'?
> ftrace_find_rec_direct(ret - MCOUNT_INSN_SIZE))
> ^~~~~~~~~~~~~~~~
> UCOUNT_COUNTS
> kernel//trace/fgraph.c:111:35: note: each undeclared identifier is reported only once for each function it appears in
>
>

The next two patches should fix this. The second patch fixes a
different location with the same problem. It appears that without
DYNAMIC_FTRACE (which x86 always has now) that this isn't defined.

-- Steve

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