* [PATCH 1/13] use cpu_relax() in busy loop
@ 2003-09-18 23:25 Chris Wright
2003-09-18 23:27 ` [PATCH 2/13] " Chris Wright
0 siblings, 1 reply; 21+ messages in thread
From: Chris Wright @ 2003-09-18 23:25 UTC (permalink / raw
To: linux-kernel; +Cc: rmk, torvalds
Replace busy loop barrier() with cpu_relax().
This is bordering on a gratuitous change given the arm def'n of
cpu_relax(). But I was fixing up other busy loops, and my grep found
this one.
===== drivers/scsi/arm/acornscsi.c 1.35 vs edited =====
--- 1.35/drivers/scsi/arm/acornscsi.c Mon Aug 25 06:37:34 2003
+++ edited/drivers/scsi/arm/acornscsi.c Thu Sep 18 11:48:26 2003
@@ -319,7 +319,7 @@
local_save_flags(flags);
local_irq_enable();
- while (time_before(jiffies, target_jiffies)) barrier();
+ while (time_before(jiffies, target_jiffies)) cpu_relax();
local_irq_restore(flags);
}
^ permalink raw reply [flat|nested] 21+ messages in thread
* [PATCH 2/13] use cpu_relax() in busy loop
2003-09-18 23:25 [PATCH 1/13] use cpu_relax() in busy loop Chris Wright
@ 2003-09-18 23:27 ` Chris Wright
2003-09-18 23:29 ` [PATCH 3/13] " Chris Wright
2003-09-19 7:33 ` [PATCH 2/13] " Arjan van de Ven
0 siblings, 2 replies; 21+ messages in thread
From: Chris Wright @ 2003-09-18 23:27 UTC (permalink / raw
To: linux-kernel; +Cc: chas, torvalds
[PATCH 2/13] use cpu_relax() in busy loop
Replace busy loop nop with cpu_relax().
===== drivers/atm/fore200e.c 1.19 vs edited =====
--- 1.19/drivers/atm/fore200e.c Tue Sep 2 11:07:59 2003
+++ edited/drivers/atm/fore200e.c Thu Sep 18 10:42:17 2003
@@ -248,7 +248,8 @@
fore200e_spin(int msecs)
{
unsigned long timeout = jiffies + MSECS(msecs);
- while (time_before(jiffies, timeout));
+ while (time_before(jiffies, timeout))
+ cpu_relax();
}
^ permalink raw reply [flat|nested] 21+ messages in thread
* [PATCH 3/13] use cpu_relax() in busy loop
2003-09-18 23:27 ` [PATCH 2/13] " Chris Wright
@ 2003-09-18 23:29 ` Chris Wright
2003-09-18 23:31 ` [PATCH 4/13] " Chris Wright
2003-09-19 7:33 ` [PATCH 2/13] " Arjan van de Ven
1 sibling, 1 reply; 21+ messages in thread
From: Chris Wright @ 2003-09-18 23:29 UTC (permalink / raw
To: linux-kernel; +Cc: torvalds
Replace busy loop nop with cpu_relax().
===== drivers/block/ps2esdi.c 1.69 vs edited =====
--- 1.69/drivers/block/ps2esdi.c Wed Sep 10 18:18:39 2003
+++ edited/drivers/block/ps2esdi.c Thu Sep 18 10:45:34 2003
@@ -550,7 +550,8 @@
printk("%s: hard reset...\n", DEVICE_NAME);
outb_p(CTRL_HARD_RESET, ESDI_CONTROL);
expire = jiffies + 2*HZ;
- while (time_before(jiffies, expire));
+ while (time_before(jiffies, expire))
+ cpu_relax();
outb_p(1, ESDI_CONTROL);
} /* hard reset */
^ permalink raw reply [flat|nested] 21+ messages in thread
* [PATCH 4/13] use cpu_relax() in busy loop
2003-09-18 23:29 ` [PATCH 3/13] " Chris Wright
@ 2003-09-18 23:31 ` Chris Wright
2003-09-18 23:33 ` [PATCH 5/13] " Chris Wright
2003-09-19 7:34 ` [PATCH 4/13] " Arjan van de Ven
0 siblings, 2 replies; 21+ messages in thread
From: Chris Wright @ 2003-09-18 23:31 UTC (permalink / raw
To: linux-kernel; +Cc: torvalds
Replace busy loop nop with cpu_relax().
===== drivers/cdrom/sonycd535.c 1.39 vs edited =====
--- 1.39/drivers/cdrom/sonycd535.c Tue Sep 9 07:41:30 2003
+++ edited/drivers/cdrom/sonycd535.c Thu Sep 18 10:52:41 2003
@@ -1526,7 +1526,8 @@
enable_interrupts();
outb(0, read_status_reg); /* does a reset? */
delay = jiffies + HZ/10;
- while (time_before(jiffies, delay)) ;
+ while (time_before(jiffies, delay))
+ cpu_relax();
sony535_irq_used = probe_irq_off(irq_mask);
disable_interrupts();
^ permalink raw reply [flat|nested] 21+ messages in thread
* [PATCH 5/13] use cpu_relax() in busy loop
2003-09-18 23:31 ` [PATCH 4/13] " Chris Wright
@ 2003-09-18 23:33 ` Chris Wright
2003-09-18 23:34 ` [PATCH 6/13] " Chris Wright
2003-09-19 7:34 ` [PATCH 4/13] " Arjan van de Ven
1 sibling, 1 reply; 21+ messages in thread
From: Chris Wright @ 2003-09-18 23:33 UTC (permalink / raw
To: linux-kernel; +Cc: torvalds
Replace busy loop nop with cpu_relax().
===== drivers/char/isicom.c 1.25 vs edited =====
--- 1.25/drivers/char/isicom.c Mon Aug 18 10:39:47 2003
+++ edited/drivers/char/isicom.c Thu Sep 18 10:54:12 2003
@@ -153,12 +153,14 @@
inw(base+0x8);
- for(i=jiffies+HZ/100;time_before(jiffies, i););
+ for(i=jiffies+HZ/100;time_before(jiffies, i);)
+ cpu_relax();
outw(0,base+0x8); /* Reset */
for(j=1;j<=3;j++) {
- for(i=jiffies+HZ;time_before(jiffies, i););
+ for(i=jiffies+HZ;time_before(jiffies, i);)
+ cpu_relax();
printk(".");
}
signature=(inw(base+0x4)) & 0xff;
^ permalink raw reply [flat|nested] 21+ messages in thread
* [PATCH 6/13] use cpu_relax() in busy loop
2003-09-18 23:33 ` [PATCH 5/13] " Chris Wright
@ 2003-09-18 23:34 ` Chris Wright
2003-09-18 23:35 ` [PATCH 7/13] " Chris Wright
0 siblings, 1 reply; 21+ messages in thread
From: Chris Wright @ 2003-09-18 23:34 UTC (permalink / raw
To: linux-kernel; +Cc: torvalds
Replace busy loop nop with cpu_relax().
===== drivers/char/moxa.c 1.25 vs edited =====
--- 1.25/drivers/char/moxa.c Mon Jun 23 18:43:58 2003
+++ edited/drivers/char/moxa.c Thu Sep 18 10:56:00 2003
@@ -2758,7 +2758,8 @@
st = jiffies;
et = st + tick;
- while (time_before(jiffies, et));
+ while (time_before(jiffies, et))
+ cpu_relax();
}
static void moxafunc(unsigned long ofsAddr, int cmd, ushort arg)
^ permalink raw reply [flat|nested] 21+ messages in thread
* [PATCH 7/13] use cpu_relax() in busy loop
2003-09-18 23:34 ` [PATCH 6/13] " Chris Wright
@ 2003-09-18 23:35 ` Chris Wright
2003-09-18 23:36 ` [PATCH 8/13] " Chris Wright
2003-09-19 7:37 ` [PATCH 7/13] " Arjan van de Ven
0 siblings, 2 replies; 21+ messages in thread
From: Chris Wright @ 2003-09-18 23:35 UTC (permalink / raw
To: linux-kernel; +Cc: jgarzik, torvalds
Replace busy loop nop with cpu_relax().
Jeff, here's a batch for net drivers. They all look pretty straight
forward.
===== drivers/net/3c501.c 1.19 vs edited =====
--- 1.19/drivers/net/3c501.c Tue Aug 26 13:21:28 2003
+++ edited/drivers/net/3c501.c Thu Sep 18 11:30:18 2003
@@ -251,7 +251,8 @@
outb(0x00, AX_CMD);
delay = jiffies + HZ/50;
- while (time_before(jiffies, delay)) ;
+ while (time_before(jiffies, delay))
+ cpu_relax();
autoirq = probe_irq_off(irq_mask);
if (autoirq == 0)
===== drivers/net/3c505.c 1.25 vs edited =====
--- 1.25/drivers/net/3c505.c Tue Aug 26 13:29:32 2003
+++ edited/drivers/net/3c505.c Thu Sep 18 11:32:26 2003
@@ -299,16 +299,20 @@
}
outb_control(adapter->hcr_val | ATTN | DIR, dev);
timeout = jiffies + 1*HZ/100;
- while (time_before_eq(jiffies, timeout));
+ while (time_before_eq(jiffies, timeout))
+ cpu_relax();
outb_control(adapter->hcr_val & ~ATTN, dev);
timeout = jiffies + 1*HZ/100;
- while (time_before_eq(jiffies, timeout));
+ while (time_before_eq(jiffies, timeout))
+ cpu_relax();
outb_control(adapter->hcr_val | FLSH, dev);
timeout = jiffies + 1*HZ/100;
- while (time_before_eq(jiffies, timeout));
+ while (time_before_eq(jiffies, timeout))
+ cpu_relax();
outb_control(adapter->hcr_val & ~FLSH, dev);
timeout = jiffies + 1*HZ/100;
- while (time_before_eq(jiffies, timeout));
+ while (time_before_eq(jiffies, timeout))
+ cpu_relax();
outb_control(orig_hcr, dev);
if (!start_receive(dev, &adapter->tx_pcb))
===== drivers/net/acenic.c 1.39 vs edited =====
--- 1.39/drivers/net/acenic.c Thu Sep 4 00:36:29 2003
+++ edited/drivers/net/acenic.c Thu Sep 18 11:33:14 2003
@@ -1757,7 +1757,8 @@
* Wait for the firmware to spin up - max 3 seconds.
*/
myjif = jiffies + 3 * HZ;
- while (time_before(jiffies, myjif) && !ap->fw_running);
+ while (time_before(jiffies, myjif) && !ap->fw_running)
+ cpu_relax();
if (!ap->fw_running) {
printk(KERN_ERR "%s: Firmware NOT running!\n", dev->name);
===== drivers/net/eepro.c 1.19 vs edited =====
--- 1.19/drivers/net/eepro.c Tue Jul 15 10:01:29 2003
+++ edited/drivers/net/eepro.c Thu Sep 18 11:33:52 2003
@@ -904,7 +904,8 @@
eepro_diag(ioaddr); /* RESET the 82595 */
delay = jiffies + HZ/50;
- while (time_before(jiffies, delay)) ;
+ while (time_before(jiffies, delay))
+ cpu_relax();
if (*irqp == probe_irq_off(irq_mask)) /* It's a good IRQ line */
break;
===== drivers/net/ewrk3.c 1.26 vs edited =====
--- 1.26/drivers/net/ewrk3.c Tue Aug 19 20:53:15 2003
+++ edited/drivers/net/ewrk3.c Thu Sep 18 11:34:50 2003
@@ -579,7 +579,8 @@
irqnum = irq[((icr & IRQ_SEL) >> 4)];
delay = jiffies + HZ/50;
- while (time_before(jiffies, delay)) ;
+ while (time_before(jiffies, delay))
+ cpu_relax();
dev->irq = probe_irq_off(irq_mask);
if ((dev->irq) && (irqnum == dev->irq)) {
printk(" and uses IRQ%d.\n", dev->irq);
===== drivers/net/lance.c 1.18 vs edited =====
--- 1.18/drivers/net/lance.c Sun Apr 20 22:41:09 2003
+++ edited/drivers/net/lance.c Thu Sep 18 11:37:30 2003
@@ -554,7 +554,8 @@
outw(0x0041, ioaddr+LANCE_DATA);
delay = jiffies + HZ/50;
- while (time_before(jiffies, delay)) ;
+ while (time_before(jiffies, delay))
+ cpu_relax();
dev->irq = probe_irq_off(irq_mask);
if (dev->irq)
printk(", probed IRQ %d", dev->irq);
@@ -627,7 +628,8 @@
outw(0x0041, ioaddr+LANCE_DATA);
delay = jiffies + HZ/25;
- while (time_before(jiffies, delay)) ;
+ while (time_before(jiffies, delay))
+ cpu_relax();
dev->irq = probe_irq_off(irq_mask);
if (dev->irq == 0) {
printk(" Failed to detect the 7990 IRQ line.\n");
===== drivers/net/ni5010.c 1.11 vs edited =====
--- 1.11/drivers/net/ni5010.c Sun Aug 31 16:14:15 2003
+++ edited/drivers/net/ni5010.c Thu Sep 18 11:40:18 2003
@@ -262,7 +262,8 @@
irq_mask = probe_irq_on();
trigger_irq(ioaddr);
delay = jiffies + HZ/50;
- while (time_before(jiffies, delay)) ;
+ while (time_before(jiffies, delay))
+ cpu_relax();
dev->irq = probe_irq_off(irq_mask);
PRINTK2((KERN_DEBUG "%s: I/O #6 passed!\n", dev->name));
===== drivers/net/ni52.c 1.11 vs edited =====
--- 1.11/drivers/net/ni52.c Sun Apr 20 23:00:41 2003
+++ edited/drivers/net/ni52.c Thu Sep 18 11:42:57 2003
@@ -499,7 +499,8 @@
ni_attn586();
delay = jiffies + HZ/50;
- while (time_before(jiffies, delay)) ;
+ while (time_before(jiffies, delay))
+ cpu_relax();
dev->irq = probe_irq_off(irq_mask);
if(!dev->irq)
{
===== drivers/net/rrunner.c 1.21 vs edited =====
--- 1.21/drivers/net/rrunner.c Tue Aug 19 20:53:16 2003
+++ edited/drivers/net/rrunner.c Thu Sep 18 11:44:53 2003
@@ -721,7 +721,8 @@
* Give the FirmWare time to chew on the `get running' command.
*/
myjif = jiffies + 5 * HZ;
- while (time_before(jiffies, myjif) && !rrpriv->fw_running);
+ while (time_before(jiffies, myjif) && !rrpriv->fw_running)
+ cpu_relax();
netif_start_queue(dev);
===== drivers/net/wan/sbni.c 1.22 vs edited =====
--- 1.22/drivers/net/wan/sbni.c Thu Sep 4 00:40:48 2003
+++ edited/drivers/net/wan/sbni.c Thu Sep 18 11:29:36 2003
@@ -343,7 +343,8 @@
outb( EN_INT | TR_REQ, ioaddr + CSR0 );
outb( PR_RES, ioaddr + CSR1 );
delay = jiffies + HZ/20;
- while (time_before(jiffies, delay)) ;
+ while (time_before(jiffies, delay))
+ cpu_relax();
irq = probe_irq_off(irq_mask);
outb( 0, ioaddr + CSR0 );
===== drivers/net/wd.c 1.12 vs edited =====
--- 1.12/drivers/net/wd.c Thu Nov 21 14:06:13 2002
+++ edited/drivers/net/wd.c Thu Sep 18 11:45:49 2003
@@ -249,7 +249,8 @@
outb_p(0x00, nic_addr + EN0_RCNTHI);
outb(E8390_RREAD+E8390_START, nic_addr); /* Trigger it... */
delay = jiffies + HZ/50;
- while (time_before(jiffies, delay)) ;
+ while (time_before(jiffies, delay))
+ cpu_relax();
dev->irq = probe_irq_off(irq_mask);
outb_p(0x00, nic_addr+EN0_IMR); /* Mask all intrs. again. */
^ permalink raw reply [flat|nested] 21+ messages in thread
* [PATCH 8/13] use cpu_relax() in busy loop
2003-09-18 23:35 ` [PATCH 7/13] " Chris Wright
@ 2003-09-18 23:36 ` Chris Wright
2003-09-18 23:37 ` [PATCH 9/13] " Chris Wright
2003-09-19 7:37 ` [PATCH 7/13] " Arjan van de Ven
1 sibling, 1 reply; 21+ messages in thread
From: Chris Wright @ 2003-09-18 23:36 UTC (permalink / raw
To: linux-kernel; +Cc: torvalds
Replace busy loop rep_nop() with cpu_relax().
This is bordering on a gratuitous change given the i386 def'n of
cpu_relax(). But I was fixing up other busy loops, and my grep found
this one.
===== arch/i386/kernel/smpboot.c 1.64 vs edited =====
--- 1.64/arch/i386/kernel/smpboot.c Mon Aug 18 19:46:23 2003
+++ edited/arch/i386/kernel/smpboot.c Thu Sep 18 10:07:18 2003
@@ -378,7 +378,7 @@
*/
if (cpu_isset(cpuid, cpu_callout_map))
break;
- rep_nop();
+ cpu_relax();
}
if (!time_before(jiffies, timeout)) {
^ permalink raw reply [flat|nested] 21+ messages in thread
* [PATCH 9/13] use cpu_relax() in busy loop
2003-09-18 23:36 ` [PATCH 8/13] " Chris Wright
@ 2003-09-18 23:37 ` Chris Wright
2003-09-18 23:40 ` [PATCH 10/13] " Chris Wright
2003-09-20 7:37 ` [PATCH 9/13] " David S. Miller
0 siblings, 2 replies; 21+ messages in thread
From: Chris Wright @ 2003-09-18 23:37 UTC (permalink / raw
To: linux-kernel; +Cc: davem, torvalds
Replace busy loop nop with cpu_relax().
===== net/ipv4/ipconfig.c 1.29 vs edited =====
--- 1.29/net/ipv4/ipconfig.c Fri Aug 15 00:41:43 2003
+++ edited/net/ipv4/ipconfig.c Thu Sep 18 11:57:00 2003
@@ -1153,7 +1153,7 @@
/* Give hardware a chance to settle */
jiff = jiffies + CONF_PRE_OPEN;
while (time_before(jiffies, jiff))
- ;
+ cpu_relax();
/* Setup all network devices */
if (ic_open_devs() < 0)
@@ -1162,7 +1162,7 @@
/* Give drivers a chance to settle */
jiff = jiffies + CONF_POST_OPEN;
while (time_before(jiffies, jiff))
- ;
+ cpu_relax();
/*
* If the config information is insufficient (e.g., our IP address or
^ permalink raw reply [flat|nested] 21+ messages in thread
* [PATCH 10/13] use cpu_relax() in busy loop
2003-09-18 23:37 ` [PATCH 9/13] " Chris Wright
@ 2003-09-18 23:40 ` Chris Wright
2003-09-18 23:41 ` [PATCH 11/13] " Chris Wright
2003-09-20 7:37 ` [PATCH 9/13] " David S. Miller
1 sibling, 1 reply; 21+ messages in thread
From: Chris Wright @ 2003-09-18 23:40 UTC (permalink / raw
To: linux-kernel; +Cc: kai.germaschewski, torvalds
Replace busy loop nop with cpu_relax().
===== drivers/isdn/hardware/avm/avmcard.h 1.17 vs edited =====
--- 1.17/drivers/isdn/hardware/avm/avmcard.h Wed Sep 3 03:09:05 2003
+++ edited/drivers/isdn/hardware/avm/avmcard.h Thu Sep 18 11:17:09 2003
@@ -233,7 +233,8 @@
static inline unsigned char b1_get_byte(unsigned int base)
{
unsigned long stop = jiffies + 1 * HZ; /* maximum wait time 1 sec */
- while (!b1_rx_full(base) && time_before(jiffies, stop));
+ while (!b1_rx_full(base) && time_before(jiffies, stop))
+ cpu_relax();
if (b1_rx_full(base))
return inb(base + B1_READ);
printk(KERN_CRIT "b1lli(0x%x): rx not full after 1 second\n", base);
@@ -264,7 +265,8 @@
static inline int b1_save_put_byte(unsigned int base, unsigned char val)
{
unsigned long stop = jiffies + 2 * HZ;
- while (!b1_tx_empty(base) && time_before(jiffies,stop));
+ while (!b1_tx_empty(base) && time_before(jiffies,stop))
+ cpu_relax();
if (!b1_tx_empty(base)) return -1;
b1outp(base, B1_WRITE, val);
return 0;
^ permalink raw reply [flat|nested] 21+ messages in thread
* [PATCH 11/13] use cpu_relax() in busy loop
2003-09-18 23:40 ` [PATCH 10/13] " Chris Wright
@ 2003-09-18 23:41 ` Chris Wright
2003-09-18 23:43 ` [PATCH 12/13] " Chris Wright
0 siblings, 1 reply; 21+ messages in thread
From: Chris Wright @ 2003-09-18 23:41 UTC (permalink / raw
To: linux-kernel; +Cc: kai.germaschewski, mac, torvalds
[PATCH 11/13] use cpu_relax() in busy loop
Replace busy loop nop with cpu_relax().
===== drivers/isdn/eicon/linio.c 1.8 vs edited =====
--- 1.8/drivers/isdn/eicon/linio.c Mon Apr 21 03:58:37 2003
+++ edited/drivers/isdn/eicon/linio.c Thu Sep 18 11:14:48 2003
@@ -38,7 +38,8 @@
{
unsigned long timeout = jiffies + ((ms * HZ) / 1000);
- while (time_before(jiffies, timeout));
+ while (time_before(jiffies, timeout))
+ cpu_relax();
}
int UxCardHandleGet(ux_diva_card_t **card, dia_card_t *cfg)
^ permalink raw reply [flat|nested] 21+ messages in thread
* [PATCH 12/13] use cpu_relax() in busy loop
2003-09-18 23:41 ` [PATCH 11/13] " Chris Wright
@ 2003-09-18 23:43 ` Chris Wright
2003-09-18 23:46 ` [PATCH 13/13] " Chris Wright
0 siblings, 1 reply; 21+ messages in thread
From: Chris Wright @ 2003-09-18 23:43 UTC (permalink / raw
To: linux-kernel; +Cc: torvalds
Replace busy loop nop with cpu_relax().
===== drivers/scsi/i91uscsi.c 1.6 vs edited =====
--- 1.6/drivers/scsi/i91uscsi.c Fri May 2 12:34:33 2003
+++ edited/drivers/scsi/i91uscsi.c Thu Sep 18 11:49:49 2003
@@ -212,7 +212,8 @@
{ /* Pause for amount jiffies */
unsigned long the_time = jiffies + amount;
- while (time_before_eq(jiffies, the_time));
+ while (time_before_eq(jiffies, the_time))
+ cpu_relax();
}
/*-- forward reference --*/
^ permalink raw reply [flat|nested] 21+ messages in thread
* [PATCH 13/13] use cpu_relax() in busy loop
2003-09-18 23:43 ` [PATCH 12/13] " Chris Wright
@ 2003-09-18 23:46 ` Chris Wright
0 siblings, 0 replies; 21+ messages in thread
From: Chris Wright @ 2003-09-18 23:46 UTC (permalink / raw
To: linux-kernel; +Cc: ak, torvalds
Replace busy loop rep_nop() with cpu_relax().
This is bordering on a gratuitous change given the x86_64 def'n of
cpu_relax(). But I was fixing up other busy loops, and my grep found
this one.
===== arch/x86_64/kernel/smpboot.c 1.21 vs edited =====
--- 1.21/arch/x86_64/kernel/smpboot.c Sat Aug 23 05:13:33 2003
+++ edited/arch/x86_64/kernel/smpboot.c Thu Sep 18 10:26:41 2003
@@ -282,7 +282,7 @@
*/
if (cpu_isset(cpuid, cpu_callout_map))
break;
- rep_nop();
+ cpu_relax();
}
if (!time_before(jiffies, timeout)) {
^ permalink raw reply [flat|nested] 21+ messages in thread
* Re: [PATCH 2/13] use cpu_relax() in busy loop
2003-09-18 23:27 ` [PATCH 2/13] " Chris Wright
2003-09-18 23:29 ` [PATCH 3/13] " Chris Wright
@ 2003-09-19 7:33 ` Arjan van de Ven
2003-09-19 19:49 ` Chris Wright
1 sibling, 1 reply; 21+ messages in thread
From: Arjan van de Ven @ 2003-09-19 7:33 UTC (permalink / raw
To: Chris Wright; +Cc: linux-kernel, chas, torvalds
[-- Attachment #1: Type: text/plain, Size: 694 bytes --]
On Fri, 2003-09-19 at 01:27, Chris Wright wrote:
> [PATCH 2/13] use cpu_relax() in busy loop
>
> Replace busy loop nop with cpu_relax().
>
> ===== drivers/atm/fore200e.c 1.19 vs edited =====
> --- 1.19/drivers/atm/fore200e.c Tue Sep 2 11:07:59 2003
> +++ edited/drivers/atm/fore200e.c Thu Sep 18 10:42:17 2003
> @@ -248,7 +248,8 @@
> fore200e_spin(int msecs)
> {
> unsigned long timeout = jiffies + MSECS(msecs);
> - while (time_before(jiffies, timeout));
> + while (time_before(jiffies, timeout))
> + cpu_relax();
> }
ehmmm how about making this use mdelay instead ?
(not to speak of maybe making it sleep, but that's a less obvious
transformation)
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^ permalink raw reply [flat|nested] 21+ messages in thread
* Re: [PATCH 4/13] use cpu_relax() in busy loop
2003-09-18 23:31 ` [PATCH 4/13] " Chris Wright
2003-09-18 23:33 ` [PATCH 5/13] " Chris Wright
@ 2003-09-19 7:34 ` Arjan van de Ven
2003-09-19 19:48 ` Chris Wright
1 sibling, 1 reply; 21+ messages in thread
From: Arjan van de Ven @ 2003-09-19 7:34 UTC (permalink / raw
To: Chris Wright; +Cc: linux-kernel, torvalds
[-- Attachment #1: Type: text/plain, Size: 534 bytes --]
On Fri, 2003-09-19 at 01:31, Chris Wright wrote:
> Replace busy loop nop with cpu_relax().
>
> ===== drivers/cdrom/sonycd535.c 1.39 vs edited =====
> --- 1.39/drivers/cdrom/sonycd535.c Tue Sep 9 07:41:30 2003
> +++ edited/drivers/cdrom/sonycd535.c Thu Sep 18 10:52:41 2003
> @@ -1526,7 +1526,8 @@
> enable_interrupts();
> outb(0, read_status_reg); /* does a reset? */
> delay = jiffies + HZ/10;
> - while (time_before(jiffies, delay)) ;
> + while (time_before(jiffies, delay))
> + cpu_relax();
mdelay ?
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^ permalink raw reply [flat|nested] 21+ messages in thread
* Re: [PATCH 7/13] use cpu_relax() in busy loop
2003-09-18 23:35 ` [PATCH 7/13] " Chris Wright
2003-09-18 23:36 ` [PATCH 8/13] " Chris Wright
@ 2003-09-19 7:37 ` Arjan van de Ven
2003-09-19 19:49 ` Chris Wright
1 sibling, 1 reply; 21+ messages in thread
From: Arjan van de Ven @ 2003-09-19 7:37 UTC (permalink / raw
To: Chris Wright; +Cc: linux-kernel, jgarzik
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On Fri, 2003-09-19 at 01:35, Chris Wright wrote:
> Replace busy loop nop with cpu_relax().
>
> Jeff, here's a batch for net drivers. They all look pretty straight
> forward.
>
> ===== drivers/net/3c501.c 1.19 vs edited =====
> --- 1.19/drivers/net/3c501.c Tue Aug 26 13:21:28 2003
> +++ edited/drivers/net/3c501.c Thu Sep 18 11:30:18 2003
> @@ -251,7 +251,8 @@
> outb(0x00, AX_CMD);
>
> delay = jiffies + HZ/50;
> - while (time_before(jiffies, delay)) ;
> + while (time_before(jiffies, delay))
> + cpu_relax();
> autoirq = probe_irq_off(irq_mask);
mdelay()
>
> if (autoirq == 0)
> ===== drivers/net/3c505.c 1.25 vs edited =====
> --- 1.25/drivers/net/3c505.c Tue Aug 26 13:29:32 2003
> +++ edited/drivers/net/3c505.c Thu Sep 18 11:32:26 2003
> @@ -299,16 +299,20 @@
> }
> outb_control(adapter->hcr_val | ATTN | DIR, dev);
> timeout = jiffies + 1*HZ/100;
> - while (time_before_eq(jiffies, timeout));
> + while (time_before_eq(jiffies, timeout))
> + cpu_relax();
mdelay()
> timeout = jiffies + 1*HZ/100;
> - while (time_before_eq(jiffies, timeout));
> + while (time_before_eq(jiffies, timeout))
> + cpu_relax();
mdelay()
> outb_control(adapter->hcr_val | FLSH, dev);
> timeout = jiffies + 1*HZ/100;
> - while (time_before_eq(jiffies, timeout));
> + while (time_before_eq(jiffies, timeout))
> + cpu_relax();
mdelay()
> outb_control(adapter->hcr_val & ~FLSH, dev);
> timeout = jiffies + 1*HZ/100;
> - while (time_before_eq(jiffies, timeout));
> + while (time_before_eq(jiffies, timeout))
> + cpu_relax();
>
mdelay()
> ===== drivers/net/eepro.c 1.19 vs edited =====
> --- 1.19/drivers/net/eepro.c Tue Jul 15 10:01:29 2003
> +++ edited/drivers/net/eepro.c Thu Sep 18 11:33:52 2003
> @@ -904,7 +904,8 @@
> eepro_diag(ioaddr); /* RESET the 82595 */
>
> delay = jiffies + HZ/50;
> - while (time_before(jiffies, delay)) ;
> + while (time_before(jiffies, delay))
> + cpu_relax();
mdelay()
> ===== drivers/net/lance.c 1.18 vs edited =====
> --- 1.18/drivers/net/lance.c Sun Apr 20 22:41:09 2003
> +++ edited/drivers/net/lance.c Thu Sep 18 11:37:30 2003
> @@ -554,7 +554,8 @@
> outw(0x0041, ioaddr+LANCE_DATA);
>
> delay = jiffies + HZ/50;
> - while (time_before(jiffies, delay)) ;
> + while (time_before(jiffies, delay))
> + cpu_relax();
mdelay()
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^ permalink raw reply [flat|nested] 21+ messages in thread
* Re: [PATCH 4/13] use cpu_relax() in busy loop
2003-09-19 7:34 ` [PATCH 4/13] " Arjan van de Ven
@ 2003-09-19 19:48 ` Chris Wright
2003-09-19 19:54 ` Arjan van de Ven
0 siblings, 1 reply; 21+ messages in thread
From: Chris Wright @ 2003-09-19 19:48 UTC (permalink / raw
To: Arjan van de Ven; +Cc: Chris Wright, linux-kernel, torvalds
* Arjan van de Ven (arjanv@redhat.com) wrote:
>
> mdelay ?
Yeah, good point. For these subsecond pauses mdelay() makes more sense.
It'd be nice to get rid of long busy loops in general. Thanks for taking
a look.
-chris
[PATCH 4/13] use mdelay() instead of busy loop
Replace busy loop with mdelay().
===== drivers/cdrom/sonycd535.c 1.39 vs edited =====
--- 1.39/drivers/cdrom/sonycd535.c Tue Sep 9 07:41:30 2003
+++ edited/drivers/cdrom/sonycd535.c Fri Sep 19 10:36:18 2003
@@ -129,6 +129,7 @@
#include <linux/mm.h>
#include <linux/slab.h>
#include <linux/init.h>
+#include <linux/delay.h>
#define REALLY_SLOW_IO
#include <asm/system.h>
@@ -1520,13 +1521,12 @@
/* A negative sony535_irq_used will attempt an autoirq. */
if (sony535_irq_used < 0) {
- unsigned long irq_mask, delay;
+ unsigned long irq_mask;
irq_mask = probe_irq_on();
enable_interrupts();
outb(0, read_status_reg); /* does a reset? */
- delay = jiffies + HZ/10;
- while (time_before(jiffies, delay)) ;
+ mdelay(100);
sony535_irq_used = probe_irq_off(irq_mask);
disable_interrupts();
^ permalink raw reply [flat|nested] 21+ messages in thread
* Re: [PATCH 7/13] use cpu_relax() in busy loop
2003-09-19 7:37 ` [PATCH 7/13] " Arjan van de Ven
@ 2003-09-19 19:49 ` Chris Wright
0 siblings, 0 replies; 21+ messages in thread
From: Chris Wright @ 2003-09-19 19:49 UTC (permalink / raw
To: Arjan van de Ven; +Cc: Chris Wright, linux-kernel, jgarzik
[PATCH 7/13] use cpu_relax() in busy loop, or mdelay instead of busy loop
Replace busy loop nop with cpu_relax(), and just use mdelay where it's better.
These look ok?
-chris
===== drivers/net/3c501.c 1.19 vs edited =====
--- 1.19/drivers/net/3c501.c Tue Aug 26 13:21:28 2003
+++ edited/drivers/net/3c501.c Fri Sep 19 11:06:57 2003
@@ -123,6 +123,7 @@
#include <linux/config.h> /* for CONFIG_IP_MULTICAST */
#include <linux/spinlock.h>
#include <linux/ethtool.h>
+#include <linux/delay.h>
#include <asm/uaccess.h>
#include <asm/bitops.h>
@@ -241,7 +242,7 @@
if (dev->irq < 2)
{
- unsigned long irq_mask, delay;
+ unsigned long irq_mask;
irq_mask = probe_irq_on();
inb(RX_STATUS); /* Clear pending interrupts. */
@@ -250,8 +251,7 @@
outb(0x00, AX_CMD);
- delay = jiffies + HZ/50;
- while (time_before(jiffies, delay)) ;
+ mdelay(20);
autoirq = probe_irq_off(irq_mask);
if (autoirq == 0)
===== drivers/net/3c505.c 1.25 vs edited =====
--- 1.25/drivers/net/3c505.c Tue Aug 26 13:29:32 2003
+++ edited/drivers/net/3c505.c Fri Sep 19 11:13:10 2003
@@ -298,17 +298,13 @@
set_hsf(dev, HSF_PCB_NAK);
}
outb_control(adapter->hcr_val | ATTN | DIR, dev);
- timeout = jiffies + 1*HZ/100;
- while (time_before_eq(jiffies, timeout));
+ mdelay(10);
outb_control(adapter->hcr_val & ~ATTN, dev);
- timeout = jiffies + 1*HZ/100;
- while (time_before_eq(jiffies, timeout));
+ mdelay(10);
outb_control(adapter->hcr_val | FLSH, dev);
- timeout = jiffies + 1*HZ/100;
- while (time_before_eq(jiffies, timeout));
+ mdelay(10);
outb_control(adapter->hcr_val & ~FLSH, dev);
- timeout = jiffies + 1*HZ/100;
- while (time_before_eq(jiffies, timeout));
+ mdelay(10);
outb_control(orig_hcr, dev);
if (!start_receive(dev, &adapter->tx_pcb))
===== drivers/net/acenic.c 1.39 vs edited =====
--- 1.39/drivers/net/acenic.c Thu Sep 4 00:36:29 2003
+++ edited/drivers/net/acenic.c Fri Sep 19 11:38:34 2003
@@ -1757,7 +1757,8 @@
* Wait for the firmware to spin up - max 3 seconds.
*/
myjif = jiffies + 3 * HZ;
- while (time_before(jiffies, myjif) && !ap->fw_running);
+ while (time_before(jiffies, myjif) && !ap->fw_running)
+ cpu_relax();
if (!ap->fw_running) {
printk(KERN_ERR "%s: Firmware NOT running!\n", dev->name);
===== drivers/net/eepro.c 1.19 vs edited =====
--- 1.19/drivers/net/eepro.c Tue Jul 15 10:01:29 2003
+++ edited/drivers/net/eepro.c Fri Sep 19 11:18:47 2003
@@ -897,14 +897,12 @@
eepro_sw2bank0(ioaddr); /* Switch back to Bank 0 */
if (request_irq (*irqp, NULL, SA_SHIRQ, "bogus", dev) != EBUSY) {
- unsigned long irq_mask, delay;
+ unsigned long irq_mask;
/* Twinkle the interrupt, and check if it's seen */
irq_mask = probe_irq_on();
eepro_diag(ioaddr); /* RESET the 82595 */
-
- delay = jiffies + HZ/50;
- while (time_before(jiffies, delay)) ;
+ mdelay(20);
if (*irqp == probe_irq_off(irq_mask)) /* It's a good IRQ line */
break;
===== drivers/net/ewrk3.c 1.26 vs edited =====
--- 1.26/drivers/net/ewrk3.c Tue Aug 19 20:53:15 2003
+++ edited/drivers/net/ewrk3.c Fri Sep 19 11:21:50 2003
@@ -564,7 +564,7 @@
if (dev->irq < 2) {
#ifndef MODULE
u_char irqnum;
- unsigned long irq_mask, delay;
+ unsigned long irq_mask;
irq_mask = probe_irq_on();
@@ -578,8 +578,7 @@
irqnum = irq[((icr & IRQ_SEL) >> 4)];
- delay = jiffies + HZ/50;
- while (time_before(jiffies, delay)) ;
+ mdelay(20);
dev->irq = probe_irq_off(irq_mask);
if ((dev->irq) && (irqnum == dev->irq)) {
printk(" and uses IRQ%d.\n", dev->irq);
===== drivers/net/lance.c 1.18 vs edited =====
--- 1.18/drivers/net/lance.c Sun Apr 20 22:41:09 2003
+++ edited/drivers/net/lance.c Fri Sep 19 11:25:56 2003
@@ -543,7 +543,7 @@
if (dev->irq >= 2)
printk(" assigned IRQ %d", dev->irq);
else if (lance_version != 0) { /* 7990 boards need DMA detection first. */
- unsigned long irq_mask, delay;
+ unsigned long irq_mask;
/* To auto-IRQ we enable the initialization-done and DMA error
interrupts. For ISA boards we get a DMA error, but VLB and PCI
@@ -553,8 +553,7 @@
/* Trigger an initialization just for the interrupt. */
outw(0x0041, ioaddr+LANCE_DATA);
- delay = jiffies + HZ/50;
- while (time_before(jiffies, delay)) ;
+ mdelay(20);
dev->irq = probe_irq_off(irq_mask);
if (dev->irq)
printk(", probed IRQ %d", dev->irq);
@@ -621,13 +620,12 @@
if (lance_version == 0 && dev->irq == 0) {
/* We may auto-IRQ now that we have a DMA channel. */
/* Trigger an initialization just for the interrupt. */
- unsigned long irq_mask, delay;
+ unsigned long irq_mask;
irq_mask = probe_irq_on();
outw(0x0041, ioaddr+LANCE_DATA);
- delay = jiffies + HZ/25;
- while (time_before(jiffies, delay)) ;
+ mdelay(40);
dev->irq = probe_irq_off(irq_mask);
if (dev->irq == 0) {
printk(" Failed to detect the 7990 IRQ line.\n");
===== drivers/net/ni5010.c 1.11 vs edited =====
--- 1.11/drivers/net/ni5010.c Sun Aug 31 16:14:15 2003
+++ edited/drivers/net/ni5010.c Fri Sep 19 11:27:11 2003
@@ -255,14 +255,13 @@
if (dev->irq == 0xff)
;
else if (dev->irq < 2) {
- unsigned long irq_mask, delay;
+ unsigned long irq_mask;
PRINTK2((KERN_DEBUG "%s: I/O #5 passed!\n", dev->name));
irq_mask = probe_irq_on();
trigger_irq(ioaddr);
- delay = jiffies + HZ/50;
- while (time_before(jiffies, delay)) ;
+ mdelay(20);
dev->irq = probe_irq_off(irq_mask);
PRINTK2((KERN_DEBUG "%s: I/O #6 passed!\n", dev->name));
===== drivers/net/ni52.c 1.11 vs edited =====
--- 1.11/drivers/net/ni52.c Sun Apr 20 23:00:41 2003
+++ edited/drivers/net/ni52.c Fri Sep 19 11:29:49 2003
@@ -492,14 +492,13 @@
if(dev->irq < 2)
{
- unsigned long irq_mask, delay;
+ unsigned long irq_mask;
irq_mask = probe_irq_on();
ni_reset586();
ni_attn586();
- delay = jiffies + HZ/50;
- while (time_before(jiffies, delay)) ;
+ mdelay(20);
dev->irq = probe_irq_off(irq_mask);
if(!dev->irq)
{
===== drivers/net/rrunner.c 1.21 vs edited =====
--- 1.21/drivers/net/rrunner.c Tue Aug 19 20:53:16 2003
+++ edited/drivers/net/rrunner.c Fri Sep 19 11:38:50 2003
@@ -721,7 +721,8 @@
* Give the FirmWare time to chew on the `get running' command.
*/
myjif = jiffies + 5 * HZ;
- while (time_before(jiffies, myjif) && !rrpriv->fw_running);
+ while (time_before(jiffies, myjif) && !rrpriv->fw_running)
+ cpu_relax();
netif_start_queue(dev);
===== drivers/net/wan/sbni.c 1.22 vs edited =====
--- 1.22/drivers/net/wan/sbni.c Thu Sep 4 00:40:48 2003
+++ edited/drivers/net/wan/sbni.c Fri Sep 19 11:32:45 2003
@@ -53,6 +53,7 @@
#include <linux/skbuff.h>
#include <linux/timer.h>
#include <linux/init.h>
+#include <linux/delay.h>
#include <net/arp.h>
@@ -337,13 +338,12 @@
outb( 0, ioaddr + CSR0 );
if( irq < 2 ) {
- unsigned long irq_mask, delay;
+ unsigned long irq_mask;
irq_mask = probe_irq_on();
outb( EN_INT | TR_REQ, ioaddr + CSR0 );
outb( PR_RES, ioaddr + CSR1 );
- delay = jiffies + HZ/20;
- while (time_before(jiffies, delay)) ;
+ mdelay(50);
irq = probe_irq_off(irq_mask);
outb( 0, ioaddr + CSR0 );
===== drivers/net/wd.c 1.12 vs edited =====
--- 1.12/drivers/net/wd.c Thu Nov 21 14:06:13 2002
+++ edited/drivers/net/wd.c Fri Sep 19 11:34:22 2003
@@ -235,7 +235,7 @@
int reg4 = inb(ioaddr+4);
if (ancient || reg1 == 0xff) { /* Ack!! No way to read the IRQ! */
short nic_addr = ioaddr+WD_NIC_OFFSET;
- unsigned long irq_mask, delay;
+ unsigned long irq_mask;
/* We have an old-style ethercard that doesn't report its IRQ
line. Do autoirq to find the IRQ line. Note that this IS NOT
@@ -248,8 +248,7 @@
outb_p(0x00, nic_addr + EN0_RCNTLO);
outb_p(0x00, nic_addr + EN0_RCNTHI);
outb(E8390_RREAD+E8390_START, nic_addr); /* Trigger it... */
- delay = jiffies + HZ/50;
- while (time_before(jiffies, delay)) ;
+ mdelay(20);
dev->irq = probe_irq_off(irq_mask);
outb_p(0x00, nic_addr+EN0_IMR); /* Mask all intrs. again. */
^ permalink raw reply [flat|nested] 21+ messages in thread
* Re: [PATCH 2/13] use cpu_relax() in busy loop
2003-09-19 7:33 ` [PATCH 2/13] " Arjan van de Ven
@ 2003-09-19 19:49 ` Chris Wright
0 siblings, 0 replies; 21+ messages in thread
From: Chris Wright @ 2003-09-19 19:49 UTC (permalink / raw
To: Arjan van de Ven; +Cc: Chris Wright, linux-kernel, chas, torvalds, mitch
* Arjan van de Ven (arjanv@redhat.com) wrote:
> ehmmm how about making this use mdelay instead ?
> (not to speak of maybe making it sleep, but that's a less obvious
> transformation)
I didn't want to change to sleep semantics of the call w/out better
review of spinlocks held/irq disabled, etc. But, after feedback from
Mitch, looks like these were only called during module init/exit. This
look ok?
thanks,
-chris
[PATCH 2/13] use schedule_timeout() instead of busy loop
Replace fore200e_spin() busy loops with schedule_timeout().
===== fore200e.c 1.19 vs edited =====
--- 1.19/drivers/atm/fore200e.c Tue Sep 2 11:07:59 2003
+++ edited/fore200e.c Fri Sep 19 12:24:15 2003
@@ -229,7 +229,8 @@
u32 hb1, hb2;
hb1 = fore200e->bus->read(&fore200e->cp_queues->heartbeat);
- fore200e_spin(10);
+ set_current_state(TASK_UNINTERRUPTIBLE);
+ schedule_timeout(10 * HZ/1000);
hb2 = fore200e->bus->read(&fore200e->cp_queues->heartbeat);
if (hb2 <= hb1) {
@@ -244,14 +245,6 @@
#endif
-static void
-fore200e_spin(int msecs)
-{
- unsigned long timeout = jiffies + MSECS(msecs);
- while (time_before(jiffies, timeout));
-}
-
-
static int
fore200e_poll(struct fore200e* fore200e, volatile u32* addr, u32 val, int msecs)
{
@@ -551,7 +544,8 @@
fore200e_pca_reset(struct fore200e* fore200e)
{
writel(PCA200E_HCR_RESET, fore200e->regs.pca.hcr);
- fore200e_spin(10);
+ set_current_state(TASK_UNINTERRUPTIBLE);
+ schedule_timeout(10 * HZ/1000);
writel(0, fore200e->regs.pca.hcr);
}
@@ -831,7 +825,8 @@
fore200e_sba_reset(struct fore200e* fore200e)
{
fore200e->bus->write(SBA200E_HCR_RESET, fore200e->regs.sba.hcr);
- fore200e_spin(10);
+ set_current_state(TASK_UNINTERRUPTIBLE);
+ schedule_timeout(10 * HZ/1000);
fore200e->bus->write(0, fore200e->regs.sba.hcr);
}
^ permalink raw reply [flat|nested] 21+ messages in thread
* Re: [PATCH 4/13] use cpu_relax() in busy loop
2003-09-19 19:48 ` Chris Wright
@ 2003-09-19 19:54 ` Arjan van de Ven
0 siblings, 0 replies; 21+ messages in thread
From: Arjan van de Ven @ 2003-09-19 19:54 UTC (permalink / raw
To: Chris Wright; +Cc: Arjan van de Ven, linux-kernel, torvalds
On Fri, Sep 19, 2003 at 12:48:45PM -0700, Chris Wright wrote:
> * Arjan van de Ven (arjanv@redhat.com) wrote:
> >
> > mdelay ?
>
> Yeah, good point. For these subsecond pauses mdelay() makes more sense.
> It'd be nice to get rid of long busy loops in general.
yep; first step is making them grep-able by using mdelay ;)
^ permalink raw reply [flat|nested] 21+ messages in thread
* Re: [PATCH 9/13] use cpu_relax() in busy loop
2003-09-18 23:37 ` [PATCH 9/13] " Chris Wright
2003-09-18 23:40 ` [PATCH 10/13] " Chris Wright
@ 2003-09-20 7:37 ` David S. Miller
1 sibling, 0 replies; 21+ messages in thread
From: David S. Miller @ 2003-09-20 7:37 UTC (permalink / raw
To: Chris Wright; +Cc: linux-kernel, torvalds
On Thu, 18 Sep 2003 16:37:57 -0700
Chris Wright <chrisw@osdl.org> wrote:
> Replace busy loop nop with cpu_relax().
Applied, thanks Chris.
^ permalink raw reply [flat|nested] 21+ messages in thread
end of thread, other threads:[~2003-09-20 7:49 UTC | newest]
Thread overview: 21+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2003-09-18 23:25 [PATCH 1/13] use cpu_relax() in busy loop Chris Wright
2003-09-18 23:27 ` [PATCH 2/13] " Chris Wright
2003-09-18 23:29 ` [PATCH 3/13] " Chris Wright
2003-09-18 23:31 ` [PATCH 4/13] " Chris Wright
2003-09-18 23:33 ` [PATCH 5/13] " Chris Wright
2003-09-18 23:34 ` [PATCH 6/13] " Chris Wright
2003-09-18 23:35 ` [PATCH 7/13] " Chris Wright
2003-09-18 23:36 ` [PATCH 8/13] " Chris Wright
2003-09-18 23:37 ` [PATCH 9/13] " Chris Wright
2003-09-18 23:40 ` [PATCH 10/13] " Chris Wright
2003-09-18 23:41 ` [PATCH 11/13] " Chris Wright
2003-09-18 23:43 ` [PATCH 12/13] " Chris Wright
2003-09-18 23:46 ` [PATCH 13/13] " Chris Wright
2003-09-20 7:37 ` [PATCH 9/13] " David S. Miller
2003-09-19 7:37 ` [PATCH 7/13] " Arjan van de Ven
2003-09-19 19:49 ` Chris Wright
2003-09-19 7:34 ` [PATCH 4/13] " Arjan van de Ven
2003-09-19 19:48 ` Chris Wright
2003-09-19 19:54 ` Arjan van de Ven
2003-09-19 7:33 ` [PATCH 2/13] " Arjan van de Ven
2003-09-19 19:49 ` Chris Wright
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