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authorGraf Yang <graf.yang@analog.com>2011-03-28 12:53:29 +0100
committerDavid Howells <dhowells@redhat.com>2011-03-28 12:53:29 +0100
commitb554cb426a955a267dba524f98f99e29bc947643 (patch)
tree525676c9164059fb4f03bab86c3b0cb9c6f21d32 /include
parenteac522ef438f8ea173569fd0469371bc5d317947 (diff)
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: Graf Yang <graf.yang@analog.com> Signed-off-by: Mike Frysinger <vapier@gentoo.org> Signed-off-by: David Howells <dhowells@redhat.com> Acked-by: Greg Ungerer <gerg@uclinux.org>
Diffstat (limited to 'include')
-rw-r--r--include/linux/vmalloc.h32
1 files changed, 32 insertions, 0 deletions
diff --git a/include/linux/vmalloc.h b/include/linux/vmalloc.h
index 4ed6fcd6b72..9332e52ea8c 100644
--- a/include/linux/vmalloc.h
+++ b/include/linux/vmalloc.h
@@ -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 */