diff options
| author | Steven Rostedt (VMware) <rostedt@goodmis.org> | 2018-11-18 17:35:37 -0500 |
|---|---|---|
| committer | Steven Rostedt (VMware) <rostedt@goodmis.org> | 2018-11-27 20:31:39 -0500 |
| commit | bc715ee4dbc5db462c59b9cfba92d31b3274fe3a (patch) | |
| tree | aa7d0b4265d85462c915c4ce13284704755f24ff | |
| parent | 18588e1487b19e45bd90bd55ec8d3a1d44f3257f (diff) | |
sh/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 superh 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: Yoshinori Sato <ysato@users.sourceforge.jp>
Cc: Rich Felker <dalias@libc.org>
Cc: linux-sh@vger.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>
| -rw-r--r-- | arch/sh/kernel/ftrace.c | 16 |
1 files changed, 2 insertions, 14 deletions
diff --git a/arch/sh/kernel/ftrace.c b/arch/sh/kernel/ftrace.c index 96dd9f7da250..1b04270e5460 100644 --- a/arch/sh/kernel/ftrace.c +++ b/arch/sh/kernel/ftrace.c @@ -321,8 +321,7 @@ int ftrace_disable_ftrace_graph_caller(void) void prepare_ftrace_return(unsigned long *parent, unsigned long self_addr) { unsigned long old; - int faulted, err; - struct ftrace_graph_ent trace; + int faulted; unsigned long return_hooker = (unsigned long)&return_to_handler; if (unlikely(ftrace_graph_is_dead())) @@ -365,18 +364,7 @@ void prepare_ftrace_return(unsigned long *parent, unsigned long self_addr) return; } - err = ftrace_push_return_trace(old, self_addr, &trace.depth, 0, NULL); - if (err == -EBUSY) { + if (function_graph_enter(old, self_addr, 0, NULL)) __raw_writel(old, parent); - return; - } - - trace.func = self_addr; - - /* Only trace if the calling function expects to */ - if (!ftrace_graph_entry(&trace)) { - current->curr_ret_stack--; - __raw_writel(old, parent); - } } #endif /* CONFIG_FUNCTION_GRAPH_TRACER */ |