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From: Markus Pargmann <mpa@pengutronix.de>
To: barebox@lists.infradead.org
Subject: [PATCH v2 2/9] log2: Add missing __rounddown_pow_of_two()
Date: Tue,  8 Dec 2015 10:39:25 +0100	[thread overview]
Message-ID: <1449567572-21758-3-git-send-email-mpa@pengutronix.de> (raw)
In-Reply-To: <1449567572-21758-1-git-send-email-mpa@pengutronix.de>

Signed-off-by: Markus Pargmann <mpa@pengutronix.de>
---
 include/linux/log2.h | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/include/linux/log2.h b/include/linux/log2.h
index d9913f06bd09..36519e3aa38b 100644
--- a/include/linux/log2.h
+++ b/include/linux/log2.h
@@ -63,6 +63,15 @@ unsigned long __roundup_pow_of_two(unsigned long n)
 	return 1UL << fls(n - 1);
 }
 
+/*
+ * round down to nearest power of two
+ */
+static inline __attribute__((const))
+unsigned long __rounddown_pow_of_two(unsigned long n)
+{
+	return 1UL << (fls_long(n) - 1);
+}
+
 /**
  * ilog2 - log of base 2 of 32-bit or a 64-bit unsigned value
  * @n - parameter
-- 
2.6.2


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  parent reply	other threads:[~2015-12-08  9:39 UTC|newest]

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-12-08  9:39 [PATCH v2 0/9] RAMOOPS read support for Barebox Markus Pargmann
2015-12-08  9:39 ` [PATCH v2 1/9] arm: boards: karo-tx6x remove definition of DIV_ROUND_UP Markus Pargmann
2015-12-08  9:39 ` Markus Pargmann [this message]
2015-12-08  9:39 ` [PATCH v2 3/9] printk: Add missing include/declaration Markus Pargmann
2015-12-08  9:39 ` [PATCH v2 4/9] vsprintf: Add scnprintf from kernel Markus Pargmann
2015-12-08  9:39 ` [PATCH v2 5/9] lib: Import reed solomon code " Markus Pargmann
2015-12-08  9:39 ` [PATCH v2 6/9] arm: Clarify memory layout calculation Markus Pargmann
2015-12-08  9:39 ` [PATCH v2 7/9] arm: start: Add visible sdram region for barebox board data Markus Pargmann
2015-12-08  9:39 ` [PATCH v2 8/9] arm: Add RAMOOPS memory area Markus Pargmann
2015-12-08  9:39 ` [PATCH v2 9/9] fs: Add pstore filesystem Markus Pargmann
2015-12-08 10:35   ` Antony Pavlov
2015-12-08 10:38     ` Markus Pargmann
2015-12-10  7:50 ` [PATCH v2 0/9] RAMOOPS read support for Barebox Sascha Hauer

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