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Let smp_call_function_single return -EBUSY on UP

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All architectures that have an implementation of smp_call_function_single
let it return -EBUSY if it is asked to execute func on the current cpu.
(akpm: except for x86_64).  Therefore the UP version must always return
-EBUSY.

[akpm@linux-foundation.org: build fix]
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: Andi Kleen <ak@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Heiko Carstens 2007-05-16 22:11:09 -07:00 committed by Linus Torvalds
parent 8317f14b60
commit 79974a0e4c
1 changed files with 3 additions and 4 deletions
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7
include/linux/smp.h
View File

@ -6,6 +6,7 @@
* Alan Cox. <alan@redhat.com>
*/
#include <linux/errno.h>
extern void cpu_idle(void);
@ -99,11 +100,9 @@ static inline void smp_send_reschedule(int cpu) { }
#define num_booting_cpus() 1
#define smp_prepare_boot_cpu() do {} while (0)
static inline int smp_call_function_single(int cpuid, void (*func) (void *info),
void *info, int retry, int wait)
void *info, int retry, int wait)
{
/* Disable interrupts here? */
func(info);
return 0;
return -EBUSY;
}
#endif /* !SMP */