powerpc/ppc64: Allow allmodconfig to build (finally !)

Guenter Roeck linux at roeck-us.net
Tue May 13 10:28:46 EST 2014

On Mon, May 12, 2014 at 03:57:34PM +1000, Benjamin Herrenschmidt wrote:
> This shuffles code around in exceptions-64s.S in order to
> allow an allmodconfig build to succeed.
> The main problems were:
>  - We have a fixed hole from 0x7000 to 0x8000 for use by FW,
> under some circumstances the code before that would grow too
> big and hit the . = 0x7000
>  - The various attempts at making space in there would trigger
> cases where short conditional branches from assembly would no
> longer be able to reach their target. This is especially nasty
> when these branches reside in alternate feature sections which
> are appended at the end of each .o file
> This fixes it by essentially moving all the "second level"
> exception handlers to after the hole and moving a couple of
> functions near the hole itself so they sit at reachable distance
> of both the first level handlers (before the hole) and the alternate
> feature sections (end of file).
> In the long run, if we start hitting this again, we'll probably
> have to split the file in two, probably at the hole location,
> to keep the alt sections used by the first level handlers close
> to them, and move everything else further away.
> But for now, this will do.
> Signed-off-by: Benjamin Herrenschmidt <benh at kernel.crashing.org>

After applying this patch, I get

arch/powerpc/kernel/exceptions-64s.S:269: Error: operand out of range
(0x000000000000814c is not between 0xffffffffffff8000 and 0x0000000000007ffc)
arch/powerpc/kernel/exceptions-64s.S:729: Error: operand out of range
(0x000000000000814c is not between 0xffffffffffff8000 and 0x0000000000007ffc)

with powerpc:defconfig, powerpc:allmodconfig, powerpc:cell_defconfig, and

This is on top of v3.15-rc5. Any idea what is going on ?

Compiler is powerpc64-poky-linux-gcc (GCC) 4.7.2 (from poky 1.4.0-1).


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