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Message-ID: <20160524060839.GA6492@gate.crashing.org> Date: Tue, 24 May 2016 01:08:39 -0500 From: Segher Boessenkool <segher@...nel.crashing.org> To: Christophe Leroy <christophe.leroy@....fr> Cc: Benjamin Herrenschmidt <benh@...nel.crashing.org>, Paul Mackerras <paulus@...ba.org>, Michael Ellerman <mpe@...erman.id.au>, Scott Wood <oss@...error.net>, linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org Subject: Re: [PATCH] powerpc: inline current_stack_pointer() 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
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