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Subjectkernel//trace/fgraph.c:111:35: error: 'MCOUNT_INSN_SIZE' undeclared; did you mean 'UCOUNT_COUNTS'?
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

vim +111 kernel//trace/fgraph.c

98
99 int function_graph_enter(unsigned long ret, unsigned long func,
100 unsigned long frame_pointer, unsigned long *retp)
101 {
102 struct ftrace_graph_ent trace;
103
104 /*
105 * Skip graph tracing if the return location is served by direct trampoline,
106 * since call sequence and return addresses is unpredicatable anymore.
107 * Ex: BPF trampoline may call original function and may skip frame
108 * depending on type of BPF programs attached.
109 */
110 if (ftrace_direct_func_count &&
> 111 ftrace_find_rec_direct(ret - MCOUNT_INSN_SIZE))
112 return -EBUSY;
113 trace.func = func;
114 trace.depth = ++current->curr_ret_depth;
115
116 if (ftrace_push_return_trace(ret, func, frame_pointer, retp))
117 goto out;
118
119 /* Only trace if the calling function expects to */
120 if (!ftrace_graph_entry(&trace))
121 goto out_ret;
122
123 return 0;
124 out_ret:
125 current->curr_ret_stack--;
126 out:
127 current->curr_ret_depth--;
128 return -EBUSY;
129 }
130

---
0-DAY kernel test infrastructure Open Source Technology Center
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org Intel Corporation
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