Subject: Re: [PATCH] powerpc: inline current_stack_pointer()

From: Segher Boessenkool <[email-masked]>
Date: Tue, 24 May 2016 01:08:39 -0500

On Tue, May 24, 2016 at 07:39:59AM +0200, Christophe Leroy wrote:
> >>+static inline unsigned long current_stack_pointer(void)
> >>+{
> >>+	register unsigned long *ptr asm("r1");
> >>+
> >>+	return *ptr;
> >>+}
> >Register asm is only guaranteed to work as input to inline asm.  NAK.
> >
> Does it mean that the following declaration in 
> arch/powerpc/include/asm/paca.h is wrong too ?
> 
> register struct paca_struct *local_paca asm("r13");

That one is fine, because it is a global var.

https://gcc.gnu.org/onlinedocs/gcc/Explicit-Register-Variables.html

Segher