Comments (6)
I'm planning on protecting the kpatch_num_registered
variable and calls to [un]register_ftrace_function, by changing:
if (!kpatch_num_registered++)
to
if (atomic_inc_return(&kpatch_num_registered) == 1)
So what else needs protection?
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That close button is dangerous. Can I get a "Close Issue" instead?! I started commenting but I thought better of it, so I wanted to close (i.e. discard) my comment.
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Then I realized I do have a point.
Thread 1 | Thread 2 |
---|---|
dec (0) | |
inc (1) | |
register | |
unregister |
The final state is kpatch_num_registered is 1 but ftrace is unregistered. We need to do the inc/dec, test, and register/unregister in an atomic way (i.e. mutex/lock).
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@Spartacus06 ah, yes, of course . And nice table, didn't realize we could make those :-)
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Ha, github removed my facepalm because it resembled an html tag.
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This issue will be fixed by #69.
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Related Issues (20)
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