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Date: Tue, 07 Dec 2010 00:59:49 -0800 From: Yinghai Lu <yinghai@...nel.org> To: mingo@...hat.com, hpa@...or.com, tglx@...utronix.de CC: linux-kernel@...r.kernel.org, bigeasy@...utronix.de Subject: [PATCH -v2] x86, ioapic: Don't write io_apic ID if it is not changed For 32bit mptable path, setup_ids_from_mpc() always write io apic id register, even there is no change needed. So try to do that when they are different bewteen reading out and mptable -v2: update to recent setup_ioapic_ids_from_mpc() split.. Signed-off-by: Yinghai Lu <yinghai@...nel.org> --- arch/x86/kernel/apic/io_apic.c | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-) Index: linux-2.6/arch/x86/kernel/apic/io_apic.c =================================================================== --- linux-2.6.orig/arch/x86/kernel/apic/io_apic.c +++ linux-2.6/arch/x86/kernel/apic/io_apic.c @@ -2006,9 +2006,12 @@ void __init setup_ioapic_ids_from_mpc_no = mp_ioapics[apic_id].apicid; /* - * Read the right value from the MPC table and - * write it into the ID register. + * Update the ID register according to the right value from + * the MPC table if they are different. */ + if (mp_ioapics[apic_id].apicid == reg_00.bits.ID) + continue; + apic_printk(APIC_VERBOSE, KERN_INFO "...changing IO-APIC physical APIC ID to %d ...", mp_ioapics[apic_id].apicid); -- 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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