Commit ede8e2bb authored by Nicholas Piggin's avatar Nicholas Piggin Committed by Michael Ellerman
Browse files

powerpc/64: implement spin loop primitives 



Signed-off-by: default avatarNicholas Piggin <npiggin@gmail.com>
Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
parent fd851a3c

arch/powerpc/include/asm/processor.h

+20 −0
Original line number Diff line number Diff line
@@ -428,6 +428,26 @@ static inline unsigned long __pack_fe01(unsigned int fpmode) 


#ifdef CONFIG_PPC64

#define cpu_relax()	do { HMT_low(); HMT_medium(); barrier(); } while (0)



#define spin_begin()	HMT_low()



#define spin_cpu_relax()	barrier()



#define spin_cpu_yield()	spin_cpu_relax()



#define spin_end()	HMT_medium()



#define spin_until_cond(cond)					\

do {								\

	if (unlikely(!(cond))) {				\

		spin_begin();					\

		do {						\

			spin_cpu_relax();			\

		} while (!(cond));				\

		spin_end();					\

	}							\

} while (0)



#else

#define cpu_relax()	barrier()

#endif