Re: [PATCH] x86: pass in pt_regs pointer for syscalls that need it (take 2)

["H. Peter Anvin" <hpa@zytor.com>]

Looks much better!

Brian Gerst wrote:
>  
>  #ifdef CONFIG_X86_32
> -/*
> - * Note: do not pass in pt_regs directly as with tail-call optimization
> - * GCC will incorrectly stomp on the caller's frame and corrupt user-space
> - * register state:
> - */
> -asmlinkage int sys_rt_sigreturn(unsigned long __unused)
> +int sys_rt_sigreturn(struct pt_regs *regs)
>  {
> -	struct pt_regs *regs = (struct pt_regs *)&__unused;
> -
>  	return do_rt_sigreturn(regs);
>  }
>  #else /* !CONFIG_X86_32 */

I observe with this sys_rt_sigreturn() is identical for both 32 and 64 
bits (since int == long for 32 bits.)  Furthermore, *both* are now no-op 
stubs around do_rt_sigreturn, so we can simply remove both stubs and 
change do_rt_sigreturn into sys_rt_sigreturn.

	-hpa