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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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8
arch/powerpc/kernel/time.c
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@@ -59,10 +59,10 @@
#include <linux/suspend.h>
#include <linux/rtc.h>
#include <linux/sched/cputime.h>
#include <linux/processor.h>
#include <asm/trace.h>
#include <asm/io.h>
#include <asm/processor.h>
#include <asm/nvram.h>
#include <asm/cache.h>
#include <asm/machdep.h>
@@ -442,6 +442,7 @@ void __delay(unsigned long loops)
unsigned long start;
int diff;
spin_begin();
if (__USE_RTC()) {
start = get_rtcl();
do {
@@ -449,13 +450,14 @@ void __delay(unsigned long loops)
diff = get_rtcl() - start;
if (diff < 0)
diff += 1000000000;
spin_cpu_relax();
} while (diff < loops);
} else {
start = get_tbl();
while (get_tbl() - start < loops)
HMT_low();
HMT_medium();
spin_cpu_relax();
}
spin_end();
}
EXPORT_SYMBOL(__delay);