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From: Maxime Ripard <maxime.ripard@free-electrons.com>
To: barebox@lists.infradead.org
Subject: [PATCH] log2: Fix declaration of __roundup_pow_of_two
Date: Tue, 26 Feb 2013 17:51:13 +0100	[thread overview]
Message-ID: <1361897473-3325-1-git-send-email-maxime.ripard@free-electrons.com> (raw)

The roundup_pow_of_two function is making use of __roundup_pow_of_two
when the call to __builtin_constant_p fails, which is not implemented in
barebox.

Copied the code from Linux log2.h header.

Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
---
 include/linux/log2.h |    9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/include/linux/log2.h b/include/linux/log2.h
index 389043a..d9913f0 100644
--- a/include/linux/log2.h
+++ b/include/linux/log2.h
@@ -54,6 +54,15 @@ bool is_power_of_2(unsigned long n)
 	return (n != 0 && ((n & (n - 1)) == 0));
 }
 
+/*
+ * round up to nearest power of two
+ */
+static inline __attribute__((const))
+unsigned long __roundup_pow_of_two(unsigned long n)
+{
+	return 1UL << fls(n - 1);
+}
+
 /**
  * ilog2 - log of base 2 of 32-bit or a 64-bit unsigned value
  * @n - parameter
-- 
1.7.10.4


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             reply	other threads:[~2013-02-26 16:51 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2013-02-26 16:51 Maxime Ripard [this message]
2013-02-27  7:59 ` Sascha Hauer

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