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kprobes/x86: ftrace based optimization for x86

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Add function tracer based kprobe optimization support
handlers on x86. This allows kprobes to use function
tracer for probing on mcount call.

Link: http://lkml.kernel.org/r/[email protected]

Cc: Thomas Gleixner <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: "H. Peter Anvin" <[email protected]>
Cc: Ananth N Mavinakayanahalli <[email protected]>
Cc: "Frank Ch. Eigler" <[email protected]>
Cc: Andrew Morton <[email protected]>
Cc: Frederic Weisbecker <[email protected]>
Signed-off-by: Masami Hiramatsu <[email protected]>

[ Updated to new port of ftrace save regs functions ]

Signed-off-by: Steven Rostedt <[email protected]>
This commit is contained in:
Masami Hiramatsu 2012-06-05 19:28:38 +09:00 • committed by Steven Rostedt
commit e525389651
4 changed files with 51 additions and 2 deletions
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2
kernel/kprobes.c
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@ -921,7 +921,7 @@ static __kprobes struct kprobe *alloc_aggr_kprobe(struct kprobe *p)
#ifdef KPROBES_CAN_USE_FTRACE
static struct ftrace_ops kprobe_ftrace_ops __read_mostly = {
.regs_func = kprobe_ftrace_handler,
.func = kprobe_ftrace_handler,
.flags = FTRACE_OPS_FL_SAVE_REGS,
};
static int kprobe_ftrace_enabled;