Some confusion about the period of updating new function in

[Minfei Huang]

ftrace
Reply-To: 

Hi, Steven.

There is a confusion which blocks my step to go further for ftrace.

Does ftrace guarantee that the replaced function is finished while
ftrace is replacing the functions? In the other word, is there a
possible that new function starts to run, while old function is also
running (maybe this function is called before replacing the function).

Function schedule_on_each_cpu maybe fails to excute, if there is no
enough memory to be allocated? Then kernel may be unstable, if ftrace
continues, without handling the error, does it?

Previously, I posted a patch to fix this issue, and you nacked it.

[PATCH] workqueue: Add the allocation flags to function
schedule_on_each_cpu_gfp

Thanks
Minfei
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