On 09/02/16 19:48, Andreas Schwab wrote:
Greg Ungerer <gerg@xxxxxxxxxxx> 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
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