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Commit 82975115 authored by David Mosberger-Tang's avatar David Mosberger-Tang Committed by Tony Luck
Browse files

[IA64] add missing cpu_relax() in ITC syncing code 



Call cpu_relax() in busy-waiting loops of the ITC-syncing code.

Signed-off-by: default avatarDavid Mosberger-Tang <davidm@hpl.hp.com>
Signed-off-by: default avatarTony Luck <tony.luck@intel.com>
parent bf1cf98f

arch/ia64/kernel/smpboot.c

+7 −4
Original line number Diff line number Diff line 
/*

 * 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);

	{