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Message-Id: <1415089784-28779-1-git-send-email-daniel@numascale.com> Date: Tue, 4 Nov 2014 16:29:41 +0800 From: Daniel J Blueman <daniel@...ascale.com> To: Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>, "H. Peter Anvin" <hpa@...or.com>, Bjorn Helgaas <bhelgaas@...gle.com> Cc: Daniel J Blueman <daniel@...ascale.com>, x86@...nel.org, linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org, Steffen Persvold <sp@...ascale.com> Subject: [PATCH v4 1/4] Numachip: Fix 16-bit APIC ID truncation 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@...ascale.com> --- apic_numachip.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/x86/kernel/apic/apic_numachip.c b/arch/x86/kernel/apic/apic_numachip.c index 81d70ba..bd083c0 100644 --- 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) & 0x3f00U); + id = ((x >> 24) & 0xffU) | ((value << 2) & 0xff00U); return id; } -- 1.9.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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