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Commit 96a9b4d3 authored by Andrew Morton's avatar Andrew Morton Committed by Linus Torvalds
Browse files

[PATCH] cpumask: uninline any_online_cpu() 



           text    data     bss     dec     hex filename
before: 3605597 1363528  363328 5332453  515de5 vmlinux
after:  3605295 1363612  363200 5332107  515c8b vmlinux

218 bytes saved.

Also, optimise any_online_cpu() out of existence on CONFIG_SMP=n.

This function seems inefficient.  Can't we simply AND the two masks, then use
find_first_bit()?

Cc: Paul Jackson <pj@sgi.com>
Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent 86302820

include/linux/cpumask.h

+3 −10
Original line number Diff line number Diff line
@@ -398,22 +398,15 @@ extern cpumask_t cpu_present_map; 


#ifdef CONFIG_SMP

int highest_possible_processor_id(void);

#define any_online_cpu(mask) __any_online_cpu(&(mask))

int __any_online_cpu(const cpumask_t *mask);

#else

#define highest_possible_processor_id()	0

#define any_online_cpu(mask)		0

#endif



#define any_online_cpu(mask)			\

({						\

	int cpu;				\

	for_each_cpu_mask(cpu, (mask))		\

		if (cpu_online(cpu))		\

			break;			\

	cpu;					\

})



#define for_each_cpu(cpu)	  for_each_cpu_mask((cpu), cpu_possible_map)

#define for_each_online_cpu(cpu)  for_each_cpu_mask((cpu), cpu_online_map)

#define for_each_present_cpu(cpu) for_each_cpu_mask((cpu), cpu_present_map)





#endif /* __LINUX_CPUMASK_H */

lib/cpumask.c

+12 −0
Original line number Diff line number Diff line
@@ -31,3 +31,15 @@ int highest_possible_processor_id(void) 
	return highest;

}

EXPORT_SYMBOL(highest_possible_processor_id);



int __any_online_cpu(const cpumask_t *mask)

{

	int cpu;



	for_each_cpu_mask(cpu, *mask) {

		if (cpu_online(cpu))

			break;

	}

	return cpu;

}

EXPORT_SYMBOL(__any_online_cpu);