x86/function_graph: Simplify with function_graph_enter()
authorSteven Rostedt (VMware) <rostedt@goodmis.org>
Sun, 18 Nov 2018 22:14:10 +0000 (17:14 -0500)
committerSteven Rostedt (VMware) <rostedt@goodmis.org>
Wed, 28 Nov 2018 01:29:22 +0000 (20:29 -0500)
commit07f7175b43827640d1e69c9eded89aa089a234b4
treee974c39688bfbed0abb2e11d2ff80ae034616bb2
parent8114865ff82e200b383e46821c25cb0625b842b5
x86/function_graph: Simplify with function_graph_enter()

The function_graph_enter() function does the work of calling the function
graph hook function and the management of the shadow stack, simplifying the
work done in the architecture dependent prepare_ftrace_return().

Have x86 use the new code, and remove the shadow stack management as well as
having to set up the trace structure.

This is needed to prepare for a fix of a design bug on how the curr_ret_stack
is used.

Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: x86@kernel.org
Cc: stable@kernel.org
Fixes: 03274a3ffb449 ("tracing/fgraph: Adjust fgraph depth before calling trace return callback")
Reviewed-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
arch/x86/kernel/ftrace.c