Commit d8d3276b authored by Wei Li's avatar Wei Li Committed by Thomas Bogendoerfer
Browse files

MIPS: SMP-CPS: Add support for irq migration when CPU offline 



Currently we won't migrate irqs when offline CPUs, which has been
implemented on most architectures. That will lead to some devices work
incorrectly if the bound cores are offline.

While that can be easily supported by enabling GENERIC_IRQ_MIGRATION.
But i don't pretty known the reason it was not supported on all MIPS
platforms.

This patch add the support for irq migration on MIPS CPS platform, and
it's tested on the interAptiv processor.

Signed-off-by: default avatarWei Li <liwei391@huawei.com>
Signed-off-by: default avatarThomas Bogendoerfer <tsbogend@alpha.franken.de>
parent ca13300a

arch/mips/Kconfig

+1 −0
Original line number Diff line number Diff line
@@ -2488,6 +2488,7 @@ config MIPS_CPS 
	select SYS_SUPPORTS_SCHED_SMT if CPU_MIPSR6

	select SYS_SUPPORTS_SMP

	select WEAK_ORDERING

	select GENERIC_IRQ_MIGRATION if HOTPLUG_CPU

	help

	  Select this if you wish to run an SMP kernel across multiple cores

	  within a MIPS Coherent Processing System. When this option is

arch/mips/kernel/smp-cps.c

+2 −0
Original line number Diff line number Diff line
@@ -12,6 +12,7 @@ 
#include <linux/slab.h>

#include <linux/smp.h>

#include <linux/types.h>

#include <linux/irq.h>



#include <asm/bcache.h>

#include <asm/mips-cps.h>
@@ -461,6 +462,7 @@ static int cps_cpu_disable(void) 
	smp_mb__after_atomic();

	set_cpu_online(cpu, false);

	calculate_cpu_foreign_map();

	irq_migrate_all_off_this_cpu();



	return 0;

}

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