Messages in this thread Patch in this message | | | Date | Thu, 18 Sep 2003 16:40:06 -0700 | From | Chris Wright <> | Subject | [PATCH 10/13] use cpu_relax() in busy loop |
| |
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; - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
| |