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authorSteven Rostedt <srostedt@redhat.com>2011-08-09 12:50:46 -0400
committerSteven Rostedt <rostedt@goodmis.org>2012-07-19 13:18:49 -0400
commita1e2e31d175a1349274eba3465d17616c6725f8c (patch)
tree5f92ba7a822f8a9911aa50157f796213bfac4ebb /kernel/trace/trace_stack.c
parentccf3672d530170c98c734dfc5db07d64bcbad2ad (diff)
downloadlwn-a1e2e31d175a1349274eba3465d17616c6725f8c.tar.gz
lwn-a1e2e31d175a1349274eba3465d17616c6725f8c.zip
ftrace: Return pt_regs to function trace callback
Return as the 4th paramater to the function tracer callback the pt_regs. Later patches that implement regs passing for the architectures will require having the ftrace_ops set the SAVE_REGS flag, which will tell the arch to take the time to pass a full set of pt_regs to the ftrace_ops callback function. If the arch does not support it then it should pass NULL. If an arch can pass full regs, then it should define: ARCH_SUPPORTS_FTRACE_SAVE_REGS to 1 Link: http://lkml.kernel.org/r/20120702201821.019966811@goodmis.org Reviewed-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com> Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Diffstat (limited to 'kernel/trace/trace_stack.c')
-rw-r--r--kernel/trace/trace_stack.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/kernel/trace/trace_stack.c b/kernel/trace/trace_stack.c
index e20006d5fb6a..2fa5328e8893 100644
--- a/kernel/trace/trace_stack.c
+++ b/kernel/trace/trace_stack.c
@@ -111,7 +111,8 @@ static inline void check_stack(void)
}
static void
-stack_trace_call(unsigned long ip, unsigned long parent_ip, struct ftrace_ops *op)
+stack_trace_call(unsigned long ip, unsigned long parent_ip,
+ struct ftrace_ops *op, struct pt_regs *pt_regs)
{
int cpu;