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authorDavid Mosberger-Tang <davidm@hpl.hp.com>2005-04-25 11:44:02 -0700
committerTony Luck <tony.luck@intel.com>2005-04-25 11:44:02 -0700
commit8297511530b0d2a281c796e738683951a59a020c (patch)
tree3ade89d674db6b0791ca72704478214d0bb56ad1 /arch
parentbf1cf98fa941fea5e630e341db4a294d531aaa3e (diff)
downloadop-kernel-dev-8297511530b0d2a281c796e738683951a59a020c.zip
op-kernel-dev-8297511530b0d2a281c796e738683951a59a020c.tar.gz
[IA64] add missing cpu_relax() in ITC syncing code
Call cpu_relax() in busy-waiting loops of the ITC-syncing code. Signed-off-by: David Mosberger-Tang <davidm@hpl.hp.com> Signed-off-by: Tony Luck <tony.luck@intel.com>
Diffstat (limited to 'arch')
-rw-r--r--arch/ia64/kernel/smpboot.c11
1 files changed, 7 insertions, 4 deletions
diff --git a/arch/ia64/kernel/smpboot.c b/arch/ia64/kernel/smpboot.c
index ca1536d..dbc6b61 100644
--- a/arch/ia64/kernel/smpboot.c
+++ b/arch/ia64/kernel/smpboot.c
@@ -1,7 +1,7 @@
/*
* SMP boot-related support
*
- * Copyright (C) 1998-2003 Hewlett-Packard Co
+ * Copyright (C) 1998-2003, 2005 Hewlett-Packard Co
* David Mosberger-Tang <davidm@hpl.hp.com>
*
* 01/05/16 Rohit Seth <rohit.seth@intel.com> Moved SMP booting functions from smp.c to here.
@@ -156,7 +156,8 @@ sync_master (void *arg)
local_irq_save(flags);
{
for (i = 0; i < NUM_ROUNDS*NUM_ITERS; ++i) {
- while (!go[MASTER]);
+ while (!go[MASTER])
+ cpu_relax();
go[MASTER] = 0;
go[SLAVE] = ia64_get_itc();
}
@@ -179,7 +180,8 @@ get_delta (long *rt, long *master)
for (i = 0; i < NUM_ITERS; ++i) {
t0 = ia64_get_itc();
go[MASTER] = 1;
- while (!(tm = go[SLAVE]));
+ while (!(tm = go[SLAVE]))
+ cpu_relax();
go[SLAVE] = 0;
t1 = ia64_get_itc();
@@ -258,7 +260,8 @@ ia64_sync_itc (unsigned int master)
return;
}
- while (go[MASTER]); /* wait for master to be ready */
+ while (go[MASTER])
+ cpu_relax(); /* wait for master to be ready */
spin_lock_irqsave(&itc_sync_lock, flags);
{
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