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Commit 0f3f506b authored by Huacai Chen's avatar Huacai Chen Committed by Ralf Baechle
Browse files

MIPS: Support hard limit of cpu count (nr_cpu_ids) 



On MIPS currently, only the soft limit of cpu count (maxcpus) has its
effect, this patch enable the hard limit (nr_cpus) as well. Processor
cores which greater than maxcpus and less than nr_cpus can be taken up
via cpu hotplug. The code is borrowed from X86.

Signed-off-by: default avatarHuacai Chen <chenhc@lemote.com>
Reviewed-by: default avatarAndreas Herrmann <andreas.herrmann@caviumnetworks.com>
Cc: John Crispin <john@phrozen.org>
Cc: Steven J. Hill <Steven.Hill@imgtec.com>
Cc: Aurelien Jarno <aurelien@aurel32.net>
Cc: linux-mips@linux-mips.org
Cc: Fuxin Zhang <zhangfx@lemote.com>
Cc: Zhangjin Wu <wuzhangjin@gmail.com>
Patchwork: https://patchwork.linux-mips.org/patch/7183/


Signed-off-by: default avatarRalf Baechle <ralf@linux-mips.org>
parent e5cd534a

arch/mips/kernel/setup.c

+20 −0
Original line number Diff line number Diff line
@@ -729,6 +729,25 @@ static void __init resource_init(void) 
	}

}



#ifdef CONFIG_SMP

static void __init prefill_possible_map(void)

{

	int i, possible = num_possible_cpus();



	if (possible > nr_cpu_ids)

		possible = nr_cpu_ids;



	for (i = 0; i < possible; i++)

		set_cpu_possible(i, true);

	for (; i < NR_CPUS; i++)

		set_cpu_possible(i, false);



	nr_cpu_ids = possible;

}

#else

static inline void prefill_possible_map(void) {}

#endif



void __init setup_arch(char **cmdline_p)

{

	cpu_probe();
@@ -752,6 +771,7 @@ void __init setup_arch(char **cmdline_p) 


	resource_init();

	plat_smp_setup();

	prefill_possible_map();



	cpu_cache_init();

}