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[PATCH] s390: additional_cpus parameter

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Introduce additional_cpus command line option.  By default no additional cpu
can be attached to the system anymore.  Only the cpus present at IPL time can
be switched on/off.  If it is desired that additional cpus can be attached to
the system the maximum number of additional cpus needs to be specified with
this option.

This change is necessary in order to limit the waste of per_cpu data
structures.

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Heiko Carstens 2006-02-17 13:52:46 -08:00 • committed by Linus Torvalds
commit 255acee706
4 changed files with 49 additions and 23 deletions
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2
include/asm-s390/smp.h
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@ -31,6 +31,7 @@ typedef struct
__u16 cpu;
} sigp_info;
extern void smp_setup_cpu_possible_map(void);
extern int smp_call_function_on(void (*func) (void *info), void *info,
int nonatomic, int wait, int cpu);
#define NO_PROC_ID 0xFF /* No processor magic marker */
@ -104,6 +105,7 @@ smp_call_function_on(void (*func) (void *info), void *info,
#define smp_cpu_not_running(cpu) 1
#define smp_get_cpu(cpu) ({ 0; })
#define smp_put_cpu(cpu) ({ 0; })
#define smp_setup_cpu_possible_map()
#endif
#endif