linux-kernel - Re: x86/.../trampoline

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Date:	Fri, 1 Feb 2008 23:15:12 +0100
From:	Pavel Machek <pavel@....cz>
To:	kernel list <linux-kernel@...r.kernel.org>
Cc:	Linux-pm mailing list <linux-pm@...ts.osdl.org>,
	"Rafael J. Wysocki" <rjw@...k.pl>
Subject: Re: x86/.../trampoline_64.S racy?

On Fri 2008-02-01 23:07:16, Pavel Machek wrote:
> Hi!
> 
> I'm trying to reuse trampoline_64.S for wakeup from ACPI s3... but I'm
> getting some badness: If I insert delay loops into trampoline_64.S,
> machine fails to boot; but I already increased cpu bootup delay to 200
> seconds...
> 
> Is it possible that bootup is subtly racy somewhere?

No, I just missed another place with timeout:

                /*
                 * Wait 5s total for a response
                 */
                for (timeout = 0; timeout < 5000000; timeout++) {
                        if (cpu_isset(cpu, cpu_callin_map))
                                break;  /* It has booted */
                        udelay(100);
                }

									Pavel

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