Messages in this thread Patch in this message | | | Subject | [PATCH -v3 6/7] kexec jump: __ftrace_enabled_save/restore | From | Huang Ying <> | Date | Tue, 12 Aug 2008 11:14:36 +0800 |
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Add __ftrace_enabled_save/restore, used to disable ftrace for a while. Now, this is used by kexec jump, which need a version without lock, for general situation, a locked version should be used.
Signed-off-by: Huang Ying <ying.huang@intel.com>
--- include/linux/ftrace.h | 21 +++++++++++++++++++++ 1 file changed, 21 insertions(+)
--- a/include/linux/ftrace.h +++ b/include/linux/ftrace.h @@ -98,6 +98,27 @@ static inline void tracer_disable(void) #endif } +/* Ftrace disable/restore without lock. Some synchronization mechanism + * must be used to prevent ftrace_enabled to be changed between + * disable/restore. */ +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))
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