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| author | Steven Rostedt (VMware) <rostedt@goodmis.org> | 2020-01-02 21:56:44 -0500 |
|---|---|---|
| committer | Steven Rostedt (VMware) <rostedt@goodmis.org> | 2020-01-02 21:56:44 -0500 |
| commit | d2ccbccb5444e9141b33cf5399927737e9ff1c3d (patch) | |
| tree | 242acc9830ad7c3e2e1cc48ffdb3f2eca28b4665 /kernel/trace/trace_stack.c | |
| parent | 02f4e01ce710fe20d2e5548d52bfdea52efd09d1 (diff) | |
| download | linux-d2ccbccb5444e9141b33cf5399927737e9ff1c3d.tar.gz linux-d2ccbccb5444e9141b33cf5399927737e9ff1c3d.tar.bz2 linux-d2ccbccb5444e9141b33cf5399927737e9ff1c3d.zip | |
tracing: Define MCOUNT_INSN_SIZE when not defined without direct calls
In order to handle direct calls along side of function graph tracer, a check
is made to see if the address being traced by the function graph tracer is a
direct call or not. To get the address used by direct callers, the return
address is subtracted by MCOUNT_INSN_SIZE.
For some archs with certain configurations, MCOUNT_INSN_SIZE is undefined
here. But these should not be using direct calls anyway. Just define
MCOUNT_INSN_SIZE to zero in this case.
Link: https://lore.kernel.org/r/202001020219.zvE3vsty%lkp@intel.com
Reported-by: kbuild test robot <lkp@intel.com>
Fixes: ff205766dbbee ("ftrace: Fix function_graph tracer interaction with BPF trampoline")
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Diffstat (limited to 'kernel/trace/trace_stack.c')
0 files changed, 0 insertions, 0 deletions