10fa1155a2
Currently we have a confused udelay implementation. * __const_udelay does not accept usecs but xloops in i386 and x86_64 * our implementation requires usecs as arg * it gets a xloops count when called by asm/arch/delay.h Bugs related to this (extremely long shutdown times) where reported by some x86_64 users, especially using Device Mapper. To hit this bug, a compile-time constant time parameter must be passed - that's why UML seems to work most times. Fix this with a simple udelay implementation. Signed-off-by: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it> Acked-by: Jeff Dike <jdike@addtoit.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
30 lines
510 B
C
30 lines
510 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);
|