AcoSail/kernel_optimize_test
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[PATCH] uml: s390 preparation, delay moved to arch

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s390 has fast read access to realtime clock (nanosecond resolution).  So it
makes sense to have an arch-specific implementation not only of __delay, but
__udelay also.

Signed-off-by: Bodo Stroesser <bstroesser@fujitsu-siemens.com>
Signed-off-by: Jeff Dike <jdike@addtoit.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Bodo Stroesser 2005-05-05 16:15:37 -07:00 committed by Linus Torvalds
parent 7d37c6d52f
commit 5fd861b682
6 changed files with 43 additions and 21 deletions
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3
arch/um/kernel/ksyms.c
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@ -10,7 +10,6 @@
#include "linux/spinlock.h"
#include "linux/highmem.h"
#include "asm/current.h"
#include "asm/delay.h"
#include "asm/processor.h"
#include "asm/unistd.h"
#include "asm/pgalloc.h"
@ -28,8 +27,6 @@ EXPORT_SYMBOL(uml_physmem);
EXPORT_SYMBOL(set_signals);
EXPORT_SYMBOL(get_signals);
EXPORT_SYMBOL(kernel_thread);
EXPORT_SYMBOL(__const_udelay);
EXPORT_SYMBOL(__udelay);
EXPORT_SYMBOL(sys_waitpid);
EXPORT_SYMBOL(task_size);
EXPORT_SYMBOL(flush_tlb_range);

18
arch/um/kernel/time_kern.c
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@ -48,8 +48,6 @@ static unsigned long long prev_usecs;
static long long delta; /* Deviation per interval */
#endif
#define MILLION 1000000
void timer_irq(union uml_pt_regs *regs)
{
unsigned long long ticks = 0;
@ -136,22 +134,6 @@ long um_stime(int __user *tptr)
return 0;
}
void __udelay(unsigned long usecs)
{
int i, n;
n = (loops_per_jiffy * HZ * usecs) / MILLION;
for(i=0;i<n;i++) ;
}
void __const_udelay(unsigned long usecs)
{
int i, n;
n = (loops_per_jiffy * HZ * usecs) / MILLION;
for(i=0;i<n;i++) ;
}
void timer_handler(int sig, union uml_pt_regs *regs)
{
local_irq_disable();

18
arch/um/sys-i386/delay.c
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@ -1,3 +1,6 @@
#include "linux/delay.h"
#include "asm/param.h"
void __delay(unsigned long time)
{
/* Stolen from the i386 __loop_delay */
@ -12,3 +15,18 @@ void __delay(unsigned long time)
:"0" (time));
}
void __udelay(unsigned long usecs)
{
int i, n;
n = (loops_per_jiffy * HZ * usecs) / MILLION;
for(i=0;i<n;i++) ;
}
void __const_udelay(unsigned long usecs)
{
int i, n;
n = (loops_per_jiffy * HZ * usecs) / MILLION;
for(i=0;i<n;i++) ;
}

5
arch/um/sys-i386/ksyms.c
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@ -2,6 +2,7 @@
#include "linux/in6.h"
#include "linux/rwsem.h"
#include "asm/byteorder.h"
#include "asm/delay.h"
#include "asm/semaphore.h"
#include "asm/uaccess.h"
#include "asm/checksum.h"
@ -14,3 +15,7 @@ EXPORT_SYMBOL(__up_wakeup);
/* Networking helper routines. */
EXPORT_SYMBOL(csum_partial);
/* delay core functions */
EXPORT_SYMBOL(__const_udelay);
EXPORT_SYMBOL(__udelay);

18
arch/um/sys-x86_64/delay.c
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@ -5,7 +5,9 @@
* Licensed under the GPL
*/
#include "linux/delay.h"
#include "asm/processor.h"
#include "asm/param.h"
void __delay(unsigned long loops)
{
@ -14,6 +16,22 @@ void __delay(unsigned long loops)
for(i = 0; i < loops; i++) ;
}
void __udelay(unsigned long usecs)
{
int i, n;
n = (loops_per_jiffy * HZ * usecs) / MILLION;
for(i=0;i<n;i++) ;
}
void __const_udelay(unsigned long usecs)
{
int i, n;
n = (loops_per_jiffy * HZ * usecs) / MILLION;
for(i=0;i<n;i++) ;
}
/*
* Overrides for Emacs so that we follow Linus's tabbing style.
* Emacs will notice this stuff at the end of the file and automatically

2
include/asm-um/delay.h
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@ -4,4 +4,6 @@
#include "asm/arch/delay.h"
#include "asm/archparam.h"
#define MILLION 1000000
#endif