diff options
| author | Steven Rostedt (VMware) <rostedt@goodmis.org> | 2020-10-28 17:42:17 -0400 |
|---|---|---|
| committer | Steven Rostedt (VMware) <rostedt@goodmis.org> | 2020-11-13 12:14:55 -0500 |
| commit | d19ad0775dcd64b49eecf4fa79c17959ebfbd26b (patch) | |
| tree | 959910248943a15ed131940bc48eef8835237c34 /arch/csky | |
| parent | 58954b3be8b7a8a0ebf1ced6fbbab808e8ccc4b6 (diff) | |
ftrace: Have the callbacks receive a struct ftrace_regs instead of pt_regs
In preparation to have arguments of a function passed to callbacks attached
to functions as default, change the default callback prototype to receive a
struct ftrace_regs as the forth parameter instead of a pt_regs.
For callbacks that set the FL_SAVE_REGS flag in their ftrace_ops flags, they
will now need to get the pt_regs via a ftrace_get_regs() helper call. If
this is called by a callback that their ftrace_ops did not have a
FL_SAVE_REGS flag set, it that helper function will return NULL.
This will allow the ftrace_regs to hold enough just to get the parameters
and stack pointer, but without the worry that callbacks may have a pt_regs
that is not completely filled.
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Diffstat (limited to 'arch/csky')
| -rw-r--r-- | arch/csky/kernel/probes/ftrace.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/arch/csky/kernel/probes/ftrace.c b/arch/csky/kernel/probes/ftrace.c index f30b179924ef..ae2b1c7b3b5c 100644 --- a/arch/csky/kernel/probes/ftrace.c +++ b/arch/csky/kernel/probes/ftrace.c @@ -11,17 +11,19 @@ int arch_check_ftrace_location(struct kprobe *p) /* Ftrace callback handler for kprobes -- called under preepmt disabed */ void kprobe_ftrace_handler(unsigned long ip, unsigned long parent_ip, - struct ftrace_ops *ops, struct pt_regs *regs) + struct ftrace_ops *ops, struct ftrace_regs *fregs) { int bit; bool lr_saver = false; struct kprobe *p; struct kprobe_ctlblk *kcb; + struct pt_regs *regs; bit = ftrace_test_recursion_trylock(ip, parent_ip); if (bit < 0) return; + regs = ftrace_get_regs(fregs); preempt_disable_notrace(); p = get_kprobe((kprobe_opcode_t *)ip); if (!p) { |