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powerpc: use spin loop primitives in some functions

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Use the different spin loop primitives in some simple powerpc
spin loops, including those which will spin as a common case.

This will help to test the spin loop primitives before more
conversions are done.

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
[mpe: Add some includes of <linux/processor.h>]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Nicholas Piggin
2017-06-06 23:08:32 +10:00
committed by Michael Ellerman
parent ede8e2bbb0
commit 4e287e655e
4 changed files with 23 additions and 10 deletions
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16
arch/powerpc/include/asm/delay.h
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@@ -2,6 +2,7 @@
#define _ASM_POWERPC_DELAY_H
#ifdef __KERNEL__
#include <linux/processor.h>
#include <asm/time.h>
/*
@@ -58,11 +59,18 @@ extern void udelay(unsigned long usecs);
typeof(condition) __ret; \
unsigned long __loops = tb_ticks_per_usec * timeout; \
unsigned long __start = get_tbl(); \
while (!(__ret = (condition)) && (tb_ticks_since(__start) <= __loops)) \
if (delay) \
\
if (delay) { \
while (!(__ret = (condition)) && \
(tb_ticks_since(__start) <= __loops)) \
udelay(delay); \
else \
cpu_relax(); \
} else { \
spin_begin(); \
while (!(__ret = (condition)) && \
(tb_ticks_since(__start) <= __loops)) \
spin_cpu_relax(); \
spin_end(); \
} \
if (!__ret) \
__ret = (condition); \
__ret; \