From: Jack Steiner <steiner@sgi.com>
Date: Thu, 11 Aug 2005 17:28:00 +0000 (-0700)
Subject: [IA64-SGI] - New SN hardware support - cpu_relax
X-Git-Tag: v2.6.14-rc1~1019^2~6^2~7
X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=68b9753f47953930cb94de0223c163f289399091;p=linux-2.6

[IA64-SGI] - New SN hardware support - cpu_relax

Add a few missing calls to "hint @pause".

Signed-off-by: Jack Steiner <steiner@sgi.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>
---

diff --git a/arch/ia64/sn/kernel/bte.c b/arch/ia64/sn/kernel/bte.c
index 7adef84190..b75814efad 100644
--- a/arch/ia64/sn/kernel/bte.c
+++ b/arch/ia64/sn/kernel/bte.c
@@ -215,6 +215,7 @@ retry_bteop:
 	}
 
 	while ((transfer_stat = *bte->most_rcnt_na) == BTE_WORD_BUSY) {
+		cpu_relax();
 		if (ia64_get_itc() > itc_end) {
 			BTE_PRINTK(("BTE timeout nasid 0x%x bte%d IBLS = 0x%lx na 0x%lx\n",
 				NASID_GET(bte->bte_base_addr), bte->bte_num,
diff --git a/arch/ia64/sn/kernel/huberror.c b/arch/ia64/sn/kernel/huberror.c
index 5c39b43ba3..5c5eb01c50 100644
--- a/arch/ia64/sn/kernel/huberror.c
+++ b/arch/ia64/sn/kernel/huberror.c
@@ -76,7 +76,7 @@ void hubiio_crb_free(struct hubdev_info *hubdev_info, int crbnum)
 	 */
 	REMOTE_HUB_S(hubdev_info->hdi_nasid, IIO_ICDR, (IIO_ICDR_PND | crbnum));
 	while (REMOTE_HUB_L(hubdev_info->hdi_nasid, IIO_ICDR) & IIO_ICDR_PND)
-		udelay(1);
+		cpu_relax();
 
 }
 
diff --git a/arch/ia64/sn/pci/pcibr/pcibr_dma.c b/arch/ia64/sn/pci/pcibr/pcibr_dma.c
index 0f254255f6..34093476e9 100644
--- a/arch/ia64/sn/pci/pcibr/pcibr_dma.c
+++ b/arch/ia64/sn/pci/pcibr/pcibr_dma.c
@@ -317,7 +317,8 @@ void sn_dma_flush(uint64_t addr)
 		*(volatile uint32_t *)(p->sfdl_force_int_addr) = 1;
 
 		/* wait for the interrupt to come back. */
-		while (*(p->sfdl_flush_addr) != 0x10f) ;
+		while (*(p->sfdl_flush_addr) != 0x10f)
+			cpu_relax();
 
 		/* okay, everything is synched up. */
 		spin_unlock_irqrestore((spinlock_t *)&p->sfdl_flush_lock, flags);
diff --git a/include/asm-ia64/sn/sn_sal.h b/include/asm-ia64/sn/sn_sal.h
index 27976d2231..99cb9ed343 100644
--- a/include/asm-ia64/sn/sn_sal.h
+++ b/include/asm-ia64/sn/sn_sal.h
@@ -749,7 +749,8 @@ ia64_sn_power_down(void)
 {
 	struct ia64_sal_retval ret_stuff;
 	SAL_CALL(ret_stuff, SN_SAL_SYSTEM_POWER_DOWN, 0, 0, 0, 0, 0, 0, 0);
-	while(1);
+	while(1)
+		cpu_relax();
 	/* never returns */
 }