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x86/ftrace: Make function graph use ftrace directly

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We don't need special hook for graph tracer entry point,
but instead we can use graph_ops::func function to install
the return_hooker.

This moves the graph tracing setup _before_ the direct
trampoline prepares the stack, so the return_hooker will
be called when the direct trampoline is finished.

This simplifies the code, because we don't need to take into
account the direct trampoline setup when preparing the graph
tracer hooker and we can allow function graph tracer on entries
registered with direct trampoline.

Link: https://lkml.kernel.org/r/20211008091336.33616-4-jolsa@kernel.org

[fixed compile error reported by kernel test robot <lkp@intel.com>]
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
This commit is contained in:
Steven Rostedt (VMware)
2021-10-08 11:13:31 +02:00
parent 4a30e4c930
commit 0c0593b45c
5 changed files with 55 additions and 35 deletions
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9
arch/x86/include/asm/ftrace.h
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@@ -57,6 +57,13 @@ arch_ftrace_get_regs(struct ftrace_regs *fregs)
#define ftrace_instruction_pointer_set(fregs, _ip) \
do { (fregs)->regs.ip = (_ip); } while (0)
struct ftrace_ops;
#define ftrace_graph_func ftrace_graph_func
void ftrace_graph_func(unsigned long ip, unsigned long parent_ip,
struct ftrace_ops *op, struct ftrace_regs *fregs);
#else
#define FTRACE_GRAPH_TRAMP_ADDR FTRACE_GRAPH_ADDR
#endif
#ifdef CONFIG_DYNAMIC_FTRACE
@@ -65,8 +72,6 @@ struct dyn_arch_ftrace {
/* No extra data needed for x86 */
};
#define FTRACE_GRAPH_TRAMP_ADDR FTRACE_GRAPH_ADDR
#endif /* CONFIG_DYNAMIC_FTRACE */
#endif /* __ASSEMBLY__ */
#endif /* CONFIG_FUNCTION_TRACER */