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


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