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sparc64: Fix cpu_possible_mask if nr_cpus is set

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If kernel boot parameter nr_cpus is set, it should define the number
of CPUs that can ever be available in the system i.e.
cpu_possible_mask. setup_nr_cpu_ids() overrides the nr_cpu_ids based
on the cpu_possible_mask during kernel initialization. If
cpu_possible_mask is not set based on the nr_cpus value, earlier part
of the kernel would be initialized using nr_cpus value leading to a
kernel crash.

Set cpu_possible_mask based on nr_cpus value. Thus setup_nr_cpu_ids()
becomes redundant and does not corrupt nr_cpu_ids value.

Signed-off-by: Atish Patra <atish.patra@oracle.com>
Reviewed-by: Bob Picco <bob.picco@oracle.com>
Reviewed-by: Vijay Kumar <vijay.ac.kumar@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Atish Patra 2016-09-15 14:54:40 -06:00 committed by David S. Miller
parent 1e953d846a
commit 9b2f753ec2
3 changed files with 16 additions and 0 deletions
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1
arch/sparc/include/asm/smp_64.h
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@ -43,6 +43,7 @@ void arch_send_call_function_ipi_mask(const struct cpumask *mask);
int hard_smp_processor_id(void);
#define raw_smp_processor_id() (current_thread_info()->cpu)
void smp_fill_in_cpu_possible_map(void);
void smp_fill_in_sib_core_maps(void);
void cpu_play_dead(void);

1
arch/sparc/kernel/setup_64.c
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@ -650,6 +650,7 @@ void __init setup_arch(char **cmdline_p)
paging_init();
init_sparc64_elf_hwcap();
smp_fill_in_cpu_possible_map();
}
extern int stop_a_enabled;

14
arch/sparc/kernel/smp_64.c
View File

@ -1227,6 +1227,20 @@ void __init smp_setup_processor_id(void)
xcall_deliver_impl = hypervisor_xcall_deliver;
}
void __init smp_fill_in_cpu_possible_map(void)
{
int possible_cpus = num_possible_cpus();
int i;
if (possible_cpus > nr_cpu_ids)
possible_cpus = nr_cpu_ids;
for (i = 0; i < possible_cpus; i++)
set_cpu_possible(i, true);
for (; i < NR_CPUS; i++)
set_cpu_possible(i, false);
}
void smp_fill_in_sib_core_maps(void)
{
unsigned int i;