On 03/02/16 05:25, Andreas Schwab wrote:
> Greg Ungerer <gerg@uclinux.org> writes:
>>> Does it work to use this signature:
>>>
>>> asmlinkage int do_sigreturn(struct switch_stack sw, struct pt_regs regs)
>>>
>>> without changing the caller?
>>
>> No, same problem.
> 
> So this is unrelated to aliasing.  Can you create a test case?

Attached is a test case - derived from the original signal.c code.
I removed a lot to get it to a manageable size. It still exhibits
the problem. I compile this test case with:

  m68k-uclinux-gcc -Wall -mcpu=5208 -fno-strict-aliasing -O2 -c -o signal.o signal.i

I get the same result if I use a m68k-linux-gcc as well (I am
using gcc-5.3 based toolchains).

Regards
Greg