Re: BUG - function tracing with breakpoints

[H. Peter Anvin]

On 05/25/2012 08:29 AM, Steven Rostedt wrote:
> 
> This would make sense for this bug, as if modifying_ftrace_code was not
> seen by other CPUs, it wouldn't go into the ftrace_int3_handler() path.
> That would cause this issue. But the bug remains after the smp_mb()'s
> were put in place. Although it behaves a little differently not. Maybe
> there's something else I missed?
> 

Perhaps you should make the modifying_ftrace_code modification atomic...
it seems odd to have it not be atomic when it is clearly accessed across
CPUs that way.

	-hpa


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