On Fri, Aug 08, 2008 at 02:52:48PM +0800, Huang Ying wrote:
> Add ftrace_enabled_save/restore, used to disable ftrace for a
> while. This is used by kexec jump.
>
> Signed-off-by: Huang Ying <ying.huang at intel.com>
>
CCing Steven Rostedt for ftrace related changes.
> ---
> include/linux/ftrace.h | 18 ++++++++++++++++++
> 1 file changed, 18 insertions(+)
>
> --- a/include/linux/ftrace.h
> +++ b/include/linux/ftrace.h
> @@ -98,6 +98,24 @@ static inline void tracer_disable(void)
> #endif
> }
>
> +static inline int ftrace_enabled_save(void)
> +{
> +#ifdef CONFIG_FTRACE
> + int saved_ftrace_enabled = ftrace_enabled;
> + ftrace_enabled = 0;
> + return saved_ftrace_enabled;
> +#else
> + return 0;
> +#endif
> +}
> +
> +static inline void ftrace_enabled_restore(int enabled)
> +{
> +#ifdef CONFIG_FTRACE
> + ftrace_enabled = enabled;
> +#endif
> +}
> +
> #ifdef CONFIG_FRAME_POINTER
> /* TODO: need to fix this for ARM */
> # define CALLER_ADDR0 ((unsigned long)__builtin_return_address(0))
>
