Re: [GIT RFC] percpu: use dynamic percpu allocator as the default percpu allocator

David Miller
2009-04-01T08:37:32Z

From: Martin Schwidefsky <schwidefsky@de.ibm.com>
Date: Wed, 1 Apr 2009 10:32:57 +0200

> The code sequence with @GOT:
>
> larl %r12,_GLOBAL_OFFSET_TABLE_
> lg %r1,symbol@GOT(%r12)
>
> is equivalent to:
>
> larl %r1,symbol@GOTENT
> lg %r1,0(%r1)
>
> The advantage of the second code sequence is that it need a single
> register and the size of the GOT is not limited to 4K as in the first
> example (the offset in an RX format instruction is limited to 12 bits -
> but that is probably something you don't want to know ;-).

If practical I think you guys should just force all of the module
address space below 4GB virtually, as we do on sparc64. It's a good
way to avoid all of these problems.