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x86: numachip: Fix 16-bit APIC ID truncation

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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>
This commit is contained in:
Daniel J Blueman 2014-11-04 16:29:41 +08:00 committed by Thomas Gleixner
parent 0df1f2487d
commit 00e7977dd1
1 changed files with 1 additions and 1 deletions
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2
arch/x86/kernel/apic/apic_numachip.c
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@ -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) & 0x3f00U);
id = ((x >> 24) & 0xffU) | ((value << 2) & 0xff00U);
return id;
}