diff options
| author | Paul Mundt <lethal@linux-sh.org> | 2008-03-12 16:51:31 +0900 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2008-03-12 12:34:37 -0700 |
| commit | 0738c4bb8f2a8bf15178f852494643b0981f578b (patch) | |
| tree | 929e985eb01594298dab4c1278d3aec9b0ec4c18 | |
| parent | baadac8b10c5ac15ce3d26b68fa266c8889b163f (diff) | |
nommu: Provide is_vmalloc_addr() stub.
Introduced in commit-id 9e2779fa281cfda13ac060753d674bbcaa23367e and
ifdef'ed out for nommu in 8ca3ed87db062201e1fa15b64a9214e193fc3a8a, both
approaches end up breaking the nommu build in different ways. An
impressive feat for a 2-liner.
Current is_vmalloc_addr() users fall in to two camps:
- Determining whether to use vfree()/kfree()
- Whether to do vmlist traversal (only /proc/kcore).
Since we don't support /proc/kcore on nommu, that leaves the
vfree()/kfree() determination use cases. nommu vfree() happens to be a
wrapper to kfree() anyways, so is_vmalloc_addr() can always return 0
and end up with the right behaviour.
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| -rw-r--r-- | include/linux/mm.h | 13 |
1 files changed, 10 insertions, 3 deletions
diff --git a/include/linux/mm.h b/include/linux/mm.h index 3f3ccfe42de..b695875d63e 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -235,15 +235,22 @@ static inline int get_page_unless_zero(struct page *page) struct page *vmalloc_to_page(const void *addr); unsigned long vmalloc_to_pfn(const void *addr); -#ifdef CONFIG_MMU -/* Determine if an address is within the vmalloc range */ +/* + * Determine if an address is within the vmalloc range + * + * On nommu, vmalloc/vfree wrap through kmalloc/kfree directly, so there + * is no special casing required. + */ static inline int is_vmalloc_addr(const void *x) { +#ifdef CONFIG_MMU unsigned long addr = (unsigned long)x; return addr >= VMALLOC_START && addr < VMALLOC_END; -} +#else + return 0; #endif +} static inline struct page *compound_head(struct page *page) { |