x86, ioapic: Avoid writing io_apic id if already correct

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For 32bit mptable path, setup_ids_from_mpc() always writes the io_apic
id register, even there is no change needed.

Skip the write, when readout and mptable match.

Signed-off-by: Yinghai Lu <yinghai@kernel.org>
Cc: Sebastian Siewior <bigeasy@linutronix.de>
LKML-Reference: <4CFDF785.7010401@kernel.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

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Yinghai Lu 2010-12-07 00:59:49 -08:00 • committed by Thomas Gleixner

parent 0450193bff

commit 60d79fd99f

1 changed files with 5 additions and 2 deletions

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arch/x86/kernel/apic/io_apic.c

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