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s390/smp: initialize cpu_present_mask in setup_arch

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In order to be able to setup the cpu to node mappings early it is a
prerequisite to know which cpus are present. Therefore cpus must be
detected much earlier than before.

For sclp based cpu detection this requires yet another early sclp
call, since the system is not ready to use the regular interrupt and
memory allocations.

Reviewed-by: Michael Holzheu <holzheu@linux.vnet.ibm.com>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Heiko Carstens 2016-12-03 09:48:01 +01:00 • committed by Martin Schwidefsky
parent ebb299a510
commit af51160ebd
7 changed files with 76 additions and 38 deletions
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1
arch/s390/kernel/setup.c
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@ -923,6 +923,7 @@ void __init setup_arch(char **cmdline_p)
cpu_detect_mhz_feature();
cpu_init();
numa_setup();
smp_detect_cpus();
/*
* Create kernel page tables and switch to virtual addressing.