diff options
| author | Huacai Chen <chenhc@lemote.com> | 2014-06-26 07:41:25 +0400 |
|---|---|---|
| committer | Ralf Baechle <ralf@linux-mips.org> | 2014-07-30 23:44:46 +0400 |
| commit | 0f3f506b275517250ee0169ec075d5382967f5f6 (patch) | |
| tree | b1f3aa1113a17c7b77d763143ab6dd6d392abeaa /arch | |
| parent | e5cd534a3125af4aaa2feb7de9f7700d0a8e91d1 (diff) | |
| download | linux-0f3f506b275517250ee0169ec075d5382967f5f6.tar.xz | |
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: Huacai Chen <chenhc@lemote.com>
Reviewed-by: Andreas 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: Ralf Baechle <ralf@linux-mips.org>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/mips/kernel/setup.c | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/arch/mips/kernel/setup.c b/arch/mips/kernel/setup.c index a842154d57dc..2f01201b158c 100644 --- a/arch/mips/kernel/setup.c +++ b/arch/mips/kernel/setup.c @@ -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(); } |