Re: [PATCH] Linux Kernel Markers

Andi Kleen
2006-09-20T11:20:06Z

Ingo Molnar <mingo@elte.hu> writes:
>
> yeah, this would be nice - if it werent it for function pointers, and if
> all kernel functions were relocatable. But if you can think of a method
> to do this, it would be nice.

x86-64 did it for some time statically to replace mem copies and some other
functions. Basically it just patches the beginning of the other function
to a jump. However this assumes that the code doesn't contain absolute addresses
(e.g. no switches). In the x86-64 it's easy because only assembly functions
are threated this way.

-Andi