From 0b9bc73711aed13246dd2cb91a3f658eeb25baf5 Mon Sep 17 00:00:00 2001
From: Rob Herring <rob.herring@calxeda.com>
Date: Tue, 5 Jul 2011 04:38:51 +0000
Subject: [PATCH] arm: add __ilog2 function
Add __ilog2 function for ARM. Needed for ahci.c
Signed-off-by: Rob Herring <rob.herring@calxeda.com>
Cc: Albert ARIBAUD <albert.aribaud@free.fr>
---
arch/arm/include/asm/bitops.h | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/arch/arm/include/asm/bitops.h b/arch/arm/include/asm/bitops.h
index 270f163eee..879e20e024 100644
--- a/arch/arm/include/asm/bitops.h
+++ b/arch/arm/include/asm/bitops.h
@@ -106,6 +106,11 @@ static inline int test_bit(int nr, const void * addr)
return ((unsigned char *) addr)[nr >> 3] & (1U << (nr & 7));
}
+static inline int __ilog2(unsigned int x)
+{
+ return generic_fls(x) - 1;
+}
+
/*
* ffz = Find First Zero in word. Undefined if no zero exists,
* so code should check against ~0UL first..
--
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