[PATCH] Fix lazy setting for PLTREL overlap cpus.

[Carlos O'Donell]

On Wed, Apr 4, 2012 at 12:17 AM, David Miller <davem@davemloft.net> wrote:
> From: "Carlos O'Donell" <carlos@systemhalted.org>
> Date: Wed, 4 Apr 2012 00:07:14 -0400
>
>> If on sparc32/sparc64 you have *never* had overlap then stop defining
>> ELF_MACHINE_PLTREL_OVERLAP at all and that's one less target to worry
>> about and one more step closer to the eventual removal of this code.
>
> I've always had overlap, and so does powerpc.  For us the JMPREL
> always sits in last slots of the DT_REL(A).  For example:
>
> davem@nunsaram:~/src$ readelf -d /lib/sparc-linux-gnu/libc.so.6
>  ...
>  0x00000002 (PLTRELSZ)                   204 (bytes)
>  ...
>  0x00000017 (JMPREL)                     0x203c0
>  0x00000007 (RELA)                       0x1517c
>  0x00000008 (RELASZ)                     45840 (bytes)
>  ...
>
> What I was saying is that I've never seen is the JMPREL being in the
> _middle_ of DT_REL(A), ie. having non-JMPREL entries both before
> and after the JMPREL ones.
>
> Ie. (JMPREL + PLTRELSZ) == (RELA + RELASZ)
>
> That's why I'm saying we don't need 3 ranges, but rather just 2.

Ah! I misread what you said. Yes, in that case, if we can *show* that
s390, power, and tile do the same then we can cleanup the code.

Cheers,
Carlos.