Re: [PATCH] m68k: use conventional function parameters for do_sigreturn

[Greg Ungerer <gerg@uclinux.org>]

On 09/02/16 19:48, Andreas Schwab wrote:
> Greg Ungerer <gerg@uclinux.org> writes:
>
>> Should I submit a gcc bug report?
>
> No, it's not a bug.  Function parameters are dead after return, so any
> writes to them can be elided.

Given the original code is:

   asmlinkage int do_sigreturn(unsigned long __unused)
   {
         struct switch_stack *sw = (struct switch_stack *) &__unused;
         struct pt_regs *regs = (struct pt_regs *) (sw + 1);

So gcc is determining that what sw and regs points to are
part of do_sigreturn() parameters here?

Given the ugliness of this grunging around in the stack I
still think my original patch to use correct pointer args is
much cleaner all round.

Regards
Greg