forked from luck/tmp_suning_uos_patched
060e352236
This patch cleans up the delay implementations a bit, makes the loops unoptimizable, and exports __udelay and __const_udelay. Signed-off-by: Jeff Dike <jdike@addtoit.com> Cc: <viro@parcelfarce.linux.theplanet.co.uk> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
42 lines
711 B
C
42 lines
711 B
C
/*
|
|
* Copyright 2003 PathScale, Inc.
|
|
* Copied from arch/x86_64
|
|
*
|
|
* Licensed under the GPL
|
|
*/
|
|
|
|
#include <linux/module.h>
|
|
#include <linux/delay.h>
|
|
#include <asm/processor.h>
|
|
#include <asm/param.h>
|
|
|
|
void __delay(unsigned long loops)
|
|
{
|
|
unsigned long i;
|
|
|
|
for(i = 0; i < loops; i++)
|
|
cpu_relax();
|
|
}
|
|
|
|
void __udelay(unsigned long usecs)
|
|
{
|
|
unsigned long i, n;
|
|
|
|
n = (loops_per_jiffy * HZ * usecs) / MILLION;
|
|
for(i=0;i<n;i++)
|
|
cpu_relax();
|
|
}
|
|
|
|
EXPORT_SYMBOL(__udelay);
|
|
|
|
void __const_udelay(unsigned long usecs)
|
|
{
|
|
unsigned long i, n;
|
|
|
|
n = (loops_per_jiffy * HZ * usecs) / MILLION;
|
|
for(i=0;i<n;i++)
|
|
cpu_relax();
|
|
}
|
|
|
|
EXPORT_SYMBOL(__const_udelay);
|