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x86: numachip: Fix 16-bit APIC ID truncation
author
Daniel J Blueman
<daniel@numascale.com>
Tue, 4 Nov 2014 08:29:41 +0000
(16:29 +0800)
committer
Sasha Levin
<sasha.levin@oracle.com>
Sat, 28 Mar 2015 14:08:32 +0000
(10:08 -0400)
[ Upstream commit
00e7977dd1bbd46e336d7ef907d0fb6b6a4c294f
]
Prevent 16-bit APIC IDs being truncated by using correct mask. This fixes
booting large systems, where the wrong core would receive the startup and
init IPIs, causing hanging.
Signed-off-by: Daniel J Blueman <daniel@numascale.com>
Cc: Steffen Persvold <sp@numascale.com>
Cc: Bjorn Helgaas <bhelgaas@google.com>
Link:
http://lkml.kernel.org/r/1415089784-28779-1-git-send-email-daniel@numascale.com
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Sasha Levin <sasha.levin@oracle.com>
arch/x86/kernel/apic/apic_numachip.c
patch
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diff --git
a/arch/x86/kernel/apic/apic_numachip.c
b/arch/x86/kernel/apic/apic_numachip.c
index
4128b5f
..
2aaee79
100644
(file)
--- a/
arch/x86/kernel/apic/apic_numachip.c
+++ b/
arch/x86/kernel/apic/apic_numachip.c
@@
-40,7
+40,7
@@
static unsigned int get_apic_id(unsigned long x)
unsigned int id;
rdmsrl(MSR_FAM10H_NODE_ID, value);
- id = ((x >> 24) & 0xffU) | ((value << 2) & 0x
3
f00U);
+ id = ((x >> 24) & 0xffU) | ((value << 2) & 0x
f
f00U);
return id;
}