From: Jack Steiner <steiner@sgi.com>
To: suresh.b.siddha@intel.com
Cc: mingo@elte.hu, linux-kernel@vger.kernel.org
Subject: Possible x2apic breakage
Date: Thu, 29 Jan 2009 09:41:46 -0600 [thread overview]
Message-ID: <20090129154146.GA2694@sgi.com> (raw)
Suresh -
This popped up in Ingo's x86 tree yesterday. This appears to be breaking
on our simulator running in x2apic mode. If I understand the code,
this is a real breakage and not a problem in our simulator:
arch/x86/include/asm/genapic.h
static inline unsigned int read_apic_id(void)
{
unsigned int reg;
reg = *(u32 *)(APIC_BASE + APIC_ID);
return apic->get_apic_id(reg);
}
As expected, the failure occurs right after:
Enabling x2apic
Enabled x2apic and interrupt-remapping
The next reference to apicid tries to read from mem instead of MSRs.
--- jack
next reply other threads:[~2009-01-29 15:41 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-01-29 15:41 Jack Steiner [this message]
2009-01-29 16:15 ` Possible x2apic breakage Ingo Molnar
2009-01-29 20:03 ` Jack Steiner
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