Let smp_call_function_single return -EBUSY on UP
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>
diff --git a/include/linux/smp.h b/include/linux/smp.h
index 3f70149..96ac21f 100644
--- a/include/linux/smp.h
+++ b/include/linux/smp.h
@@ -6,6 +6,7 @@
* Alan Cox. <alan@redhat.com>
*/
+#include <linux/errno.h>
extern void cpu_idle(void);
@@ -99,11 +100,9 @@
#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 */