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smp: add set_nr_cpu_ids()

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In preparation to support compile-time nr_cpu_ids, add a setter for
the variable.

This is a no-op for all arches.

Signed-off-by: Yury Norov <yury.norov@gmail.com>
This commit is contained in:
Yury Norov 2022-09-05 16:08:17 -07:00
parent 53fc190cc6
commit 38bef8e57f
6 changed files with 12 additions and 7 deletions
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2
arch/loongarch/kernel/setup.c
View File

@ -346,7 +346,7 @@ static void __init prefill_possible_map(void)
for (; i < NR_CPUS; i++)
set_cpu_possible(i, false);
nr_cpu_ids = possible;
set_nr_cpu_ids(possible);
}
#endif

2
arch/mips/kernel/setup.c
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@ -750,7 +750,7 @@ static void __init prefill_possible_map(void)
for (; i < NR_CPUS; i++)
set_cpu_possible(i, false);
nr_cpu_ids = possible;
set_nr_cpu_ids(possible);
}
#else
static inline void prefill_possible_map(void) {}

4
arch/x86/kernel/smpboot.c
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@ -1316,7 +1316,7 @@ static void __init smp_sanity_check(void)
nr++;
}
nr_cpu_ids = 8;
set_nr_cpu_ids(8);
}
#endif
@ -1569,7 +1569,7 @@ __init void prefill_possible_map(void)
possible = i;
}
nr_cpu_ids = possible;
set_nr_cpu_ids(possible);
pr_info("Allowing %d CPUs, %d hotplug CPUs\n",
possible, max_t(int, possible - num_processors, 0));

2
arch/x86/xen/smp_pv.c
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@ -179,7 +179,7 @@ static void __init _get_smp_config(unsigned int early)
* hypercall to expand the max number of VCPUs an already
* running guest has. So cap it up to X. */
if (subtract)
nr_cpu_ids = nr_cpu_ids - subtract;
set_nr_cpu_ids(nr_cpu_ids - subtract);
#endif
}

5
include/linux/cpumask.h
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@ -39,6 +39,11 @@ typedef struct cpumask { DECLARE_BITMAP(bits, NR_CPUS); } cpumask_t;
#define nr_cpu_ids 1U
#else
extern unsigned int nr_cpu_ids;
static inline void set_nr_cpu_ids(unsigned int nr)
{
nr_cpu_ids = nr;
}
#endif
#ifdef CONFIG_CPUMASK_OFFSTACK

4
kernel/smp.c
View File

@ -1070,7 +1070,7 @@ static int __init nrcpus(char *str)
int nr_cpus;
if (get_option(&str, &nr_cpus) && nr_cpus > 0 && nr_cpus < nr_cpu_ids)
nr_cpu_ids = nr_cpus;
set_nr_cpu_ids(nr_cpus);
return 0;
}
@ -1097,7 +1097,7 @@ EXPORT_SYMBOL(nr_cpu_ids);
/* An arch may set nr_cpu_ids earlier if needed, so this would be redundant */
void __init setup_nr_cpu_ids(void)
{
nr_cpu_ids = find_last_bit(cpumask_bits(cpu_possible_mask),NR_CPUS) + 1;
set_nr_cpu_ids(find_last_bit(cpumask_bits(cpu_possible_mask), NR_CPUS) + 1);
}
/* Called by boot processor to activate the rest. */