The patch titled
log2.h: Define order_base_2() macro for convenience.
has been added to the -mm tree. Its filename is
log2h-define-order_base_2-macro-for-convenience.patch
*** Remember to use Documentation/SubmitChecklist when testing your code ***
See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find
out what to do about this
------------------------------------------------------
Subject: log2.h: Define order_base_2() macro for convenience.
From: "Robert P. J. Day" <rpjday@xxxxxxxxxxxxxx>
Given a number of places in the tree that need to calculate this value
explicitly, might as well just create a macro for it.
(akpm: must be implemented as a macro for callee typeof() usage)
Signed-off-by: Robert P. J. Day <rpjday@xxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/linux/log2.h | 16 ++++++++++++++++
1 file changed, 16 insertions(+)
diff -puN include/linux/log2.h~log2h-define-order_base_2-macro-for-convenience include/linux/log2.h
--- a/include/linux/log2.h~log2h-define-order_base_2-macro-for-convenience
+++ a/include/linux/log2.h
@@ -190,4 +190,20 @@ unsigned long __rounddown_pow_of_two(uns
__rounddown_pow_of_two(n) \
)
+/**
+ * order_base_2 - calculate the (rounded up) base 2 order of the argument
+ * @n: parameter
+ *
+ * The first few values calculated by this routine:
+ * ob2(0) = 0
+ * ob2(1) = 0
+ * ob2(2) = 1
+ * ob2(3) = 2
+ * ob2(4) = 2
+ * ob2(5) = 3
+ * ... and so on.
+ */
+
+#define order_base_2(n) ilog2(roundup_pow_of_two(n))
+
#endif /* _LINUX_LOG2_H */
_
Patches currently in -mm which might be from rpjday@xxxxxxxxxxxxxx are
arm-remove-reference-to-non-existent-mtd_obsolete_chips.patch
hwmon-replace-power-of-two-test-in-drivers-hwmon-adt7470c.patch
git-mips.patch
pcmcia-net-use-roundup_pow_of_two-macro-instead-of-grotesque-loop.patch
blackfin-typo-config_rtc_bfin_module.patch
git-sparc64.patch
frv-move-dma-macros-to-scatterlisth-for-consistency.patch
m68knommu-remove-vestiges-of-non-existent-disktel.patch
uml-delete-some-unused-headers.patch
rd-use-is_power_of_2-in-drivers-block-rdc.patch
log2h-define-order_base_2-macro-for-convenience.patch
rtc-s3c-use-is_power_of_2-macro-for-simplicity.patch
-
To unsubscribe from this list: send the line "unsubscribe mm-commits" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
