diff options
Diffstat (limited to 'include/linux')
-rw-r--r-- | include/linux/ftrace.h | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/include/linux/ftrace.h b/include/linux/ftrace.h index 8b37b8105398..2bc7bd6b8387 100644 --- a/include/linux/ftrace.h +++ b/include/linux/ftrace.h @@ -272,6 +272,12 @@ static inline struct ftrace_direct_func *ftrace_find_direct_func(unsigned long a * via ftrace (because there's other callbacks besides the * direct call), can inform the architecture's trampoline that this * routine has a direct caller, and what the caller is. + * + * For example, in x86, it returns the direct caller + * callback function via the regs->orig_ax parameter. + * Then in the ftrace trampoline, if this is set, it makes + * the return from the trampoline jump to the direct caller + * instead of going back to the function it just traced. */ static inline void arch_ftrace_set_direct_caller(struct pt_regs *regs, unsigned long addr) { } |