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Commit b554cb42 authored by Graf Yang's avatar Graf Yang Committed by David Howells
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NOMMU: support SMP dynamic percpu_alloc 



The percpu code requires more functions to be implemented in the mm core
which nommu currently does not provide.  So add inline implementations
since these are largely meaningless on nommu systems.

Signed-off-by: default avatarGraf Yang <graf.yang@analog.com>
Signed-off-by: default avatarMike Frysinger <vapier@gentoo.org>
Signed-off-by: default avatarDavid Howells <dhowells@redhat.com>
Acked-by: default avatarGreg Ungerer <gerg@uclinux.org>
parent eac522ef

include/linux/vmalloc.h

+32 −0
Original line number Diff line number Diff line
@@ -95,10 +95,27 @@ extern struct vm_struct *remove_vm_area(const void *addr); 


extern int map_vm_area(struct vm_struct *area, pgprot_t prot,

			struct page ***pages);

#ifdef CONFIG_MMU

extern int map_kernel_range_noflush(unsigned long start, unsigned long size,

				    pgprot_t prot, struct page **pages);

extern void unmap_kernel_range_noflush(unsigned long addr, unsigned long size);

extern void unmap_kernel_range(unsigned long addr, unsigned long size);

#else

static inline int

map_kernel_range_noflush(unsigned long start, unsigned long size,

			pgprot_t prot, struct page **pages)

{

	return size >> PAGE_SHIFT;

}

static inline void

unmap_kernel_range_noflush(unsigned long addr, unsigned long size)

{

}

static inline void

unmap_kernel_range(unsigned long addr, unsigned long size)

{

}

#endif



/* Allocate/destroy a 'vmalloc' VM area. */

extern struct vm_struct *alloc_vm_area(size_t size);
@@ -116,11 +133,26 @@ extern struct vm_struct *vmlist; 
extern __init void vm_area_register_early(struct vm_struct *vm, size_t align);



#ifdef CONFIG_SMP

# ifdef CONFIG_MMU

struct vm_struct **pcpu_get_vm_areas(const unsigned long *offsets,

				     const size_t *sizes, int nr_vms,

				     size_t align);



void pcpu_free_vm_areas(struct vm_struct **vms, int nr_vms);

# else

static inline struct vm_struct **

pcpu_get_vm_areas(const unsigned long *offsets,

		const size_t *sizes, int nr_vms,

		size_t align)

{

	return NULL;

}



static inline void

pcpu_free_vm_areas(struct vm_struct **vms, int nr_vms)

{

}

# endif

#endif



#endif /* _LINUX_VMALLOC_H */