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authorStephen Rothwell <sfr@canb.auug.org.au>2005-09-04 00:54:30 +0200
committerLinus Torvalds <torvalds@evo.osdl.org>2005-09-05 09:05:39 +0200
commitfd4fd5aac1282825195c6816ed40a2a6d42db5bf (patch)
tree5908cf4c88a7c9d69ea7bdc1c354d51b6ff47f86 /include/asm-generic/page.h
parent[PATCH] sparsemem extreme: hotplug preparation (diff)
downloadlinux-fd4fd5aac1282825195c6816ed40a2a6d42db5bf.tar.xz
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/page.h')
-rw-r--r--include/asm-generic/page.h26
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 */