Commit 88e01285 authored Apr 14, 2009 by Heiko Carstens Committed by Martin Schwidefsky Apr 14, 2009

[S390] smp: fix cpu_possible_map initialization



The cpu_possible_map by default is initialized with all ones in s390.
If the kernel paramert possible_cpus=<x> is passed the cpu_possible_map
is supposed to have x bits set.
However the current code just sets the x bits without clearing the NR_CPUS
bits that were already set. So we end up with an unchanged map that has
all bits set.
To fix this just clear the map before setting any new bits.

This broke with def6cfb7
"[S390] cpumask: Use accessors code."

Cc: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

parent 52db45c3

arch/s390/kernel/smp.c

+2 −1

Original line number	Diff line number	Diff line
		@@ -591,7 +591,8 @@ static int __init setup_possible_cpus(char *s)
		int pcpus, cpu;

		pcpus = simple_strtoul(s, NULL, 0);
		for (cpu = 0; cpu < pcpus && cpu < nr_cpu_ids; cpu++)
		init_cpu_possible(cpumask_of(0));
		for (cpu = 1; cpu < pcpus && cpu < nr_cpu_ids; cpu++)
		set_cpu_possible(cpu, true);
		return 0;
		}

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