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| author |   Josh Poimboeuf <jpoimboe@redhat.com> | 2019-11-08 16:51:00 -0600 |
|---|---|---|
| committer |   Steven Rostedt (VMware) <rostedt@goodmis.org> | 2019-11-13 09:36:50 -0500 |
| commit | 77ac117b3a82251b109ffc5daf7d1c5392734be3 (patch) | |
| tree | 2ece11020db1a9ad22aad0ea14c718e5a15519e5 /kernel/trace/trace.c | |
| parent | ftrace/x86: Add a counter to test function_graph with direct (diff) | |
| download | linux-dev-77ac117b3a82251b109ffc5daf7d1c5392734be3.tar.xz linux-dev-77ac117b3a82251b109ffc5daf7d1c5392734be3.zip | |
ftrace/x86: Tell objtool to ignore nondeterministic ftrace stack layout
Objtool complains about the new ftrace direct trampoline code:
arch/x86/kernel/ftrace_64.o: warning: objtool: ftrace_regs_caller()+0x190: stack state mismatch: cfa1=7+16 cfa2=7+24
Typically, code has a deterministic stack layout, such that at a given
instruction address, the stack frame size is always the same.
That's not the case for the new ftrace_regs_caller() code after it
adjusts the stack for the direct case. Just plead ignorance and assume
it's always the non-direct path. Note this creates a tiny window for
ORC to get confused.
Link: http://lkml.kernel.org/r/20191108225100.ea3bhsbdf6oerj6g@treble
Reported-by: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Diffstat (limited to 'kernel/trace/trace.c')
0 files changed, 0 insertions, 0 deletions