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| author | Stephen Rothwell <sfr@canb.auug.org.au> | 2005-09-03 15:54:30 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@evo.osdl.org> | 2005-09-05 00:05:39 -0700 |
| commit | fd4fd5aac1282825195c6816ed40a2a6d42db5bf (patch) | |
| tree | 5908cf4c88a7c9d69ea7bdc1c354d51b6ff47f86 /include/asm-generic | |
| parent | 28ae55c98e4d16eac9a05a8a259d7763ef3aeb18 (diff) | |
| download | linux-fd4fd5aac1282825195c6816ed40a2a6d42db5bf.tar.gz linux-fd4fd5aac1282825195c6816ed40a2a6d42db5bf.tar.bz2 linux-fd4fd5aac1282825195c6816ed40a2a6d42db5bf.zip | |
[PATCH] mm: consolidate get_order
Someone mentioned that almost all the architectures used basically the same
implementation of get_order. This patch consolidates them into
asm-generic/page.h and includes that in the appropriate places. The
exceptions are ia64 and ppc which have their own (presumably optimised)
versions.
Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'include/asm-generic')
| -rw-r--r-- | include/asm-generic/page.h | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/include/asm-generic/page.h b/include/asm-generic/page.h new file mode 100644 index 000000000000..a96b5d986b6e --- /dev/null +++ b/include/asm-generic/page.h @@ -0,0 +1,26 @@ +#ifndef _ASM_GENERIC_PAGE_H +#define _ASM_GENERIC_PAGE_H + +#ifdef __KERNEL__ +#ifndef __ASSEMBLY__ + +#include <linux/compiler.h> + +/* Pure 2^n version of get_order */ +static __inline__ __attribute_const__ int get_order(unsigned long size) +{ + int order; + + size = (size - 1) >> (PAGE_SHIFT - 1); + order = -1; + do { + size >>= 1; + order++; + } while (size); + return order; +} + +#endif /* __ASSEMBLY__ */ +#endif /* __KERNEL__ */ + +#endif /* _ASM_GENERIC_PAGE_H */ |