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ftrace: Return pt_regs to function trace callback

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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>
This commit is contained in:
Steven Rostedt 2011-08-09 12:50:46 -04:00 • committed by Steven Rostedt
parent ccf3672d53
commit a1e2e31d17
9 changed files with 47 additions and 30 deletions
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15
kernel/trace/trace_selftest.c
View file

@ -104,7 +104,8 @@ static inline void warn_failed_init_tracer(struct tracer *trace, int init_ret)
static int trace_selftest_test_probe1_cnt;
static void trace_selftest_test_probe1_func(unsigned long ip,
unsigned long pip,
struct ftrace_ops *op)
struct ftrace_ops *op,
struct pt_regs *pt_regs)
{
trace_selftest_test_probe1_cnt++;
}
@ -112,7 +113,8 @@ static void trace_selftest_test_probe1_func(unsigned long ip,
static int trace_selftest_test_probe2_cnt;
static void trace_selftest_test_probe2_func(unsigned long ip,
unsigned long pip,
struct ftrace_ops *op)
struct ftrace_ops *op,
struct pt_regs *pt_regs)
{
trace_selftest_test_probe2_cnt++;
}
@ -120,7 +122,8 @@ static void trace_selftest_test_probe2_func(unsigned long ip,
static int trace_selftest_test_probe3_cnt;
static void trace_selftest_test_probe3_func(unsigned long ip,
unsigned long pip,
struct ftrace_ops *op)
struct ftrace_ops *op,
struct pt_regs *pt_regs)
{
trace_selftest_test_probe3_cnt++;
}
@ -128,7 +131,8 @@ static void trace_selftest_test_probe3_func(unsigned long ip,
static int trace_selftest_test_global_cnt;
static void trace_selftest_test_global_func(unsigned long ip,
unsigned long pip,
struct ftrace_ops *op)
struct ftrace_ops *op,
struct pt_regs *pt_regs)
{
trace_selftest_test_global_cnt++;
}
@ -136,7 +140,8 @@ static void trace_selftest_test_global_func(unsigned long ip,
static int trace_selftest_test_dyn_cnt;
static void trace_selftest_test_dyn_func(unsigned long ip,
unsigned long pip,
struct ftrace_ops *op)
struct ftrace_ops *op,
struct pt_regs *pt_regs)
{
trace_selftest_test_dyn_cnt++;
}