linux-kernel - [PATCH] arch/powerpc: provide zero

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Message-ID: <1444229188-19640-1-git-send-email-cmetcalf@ezchip.com>
Date:	Wed, 7 Oct 2015 10:46:28 -0400
From:	Chris Metcalf <cmetcalf@...hip.com>
To:	Michal Sojka <sojkam1@....cvut.cz>, Ingo Molnar <mingo@...nel.org>,
	"Linus Torvalds" <torvalds@...ux-foundation.org>,
	"H. Peter Anvin" <hpa@...or.com>,
	Philippe Bergheaud <felix@...ux.vnet.ibm.com>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Paul Mackerras <paulus@...ba.org>,
	"Michael Ellerman" <mpe@...erman.id.au>,
	"David S. Miller" <davem@...emloft.net>,
	"Anton Blanchard" <anton@...ba.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
CC:	Chris Metcalf <cmetcalf@...hip.com>
Subject: [PATCH] arch/powerpc: provide zero_bytemask() for big-endian

For some reason, only the little-endian flavor of
powerpc provided the zero_bytemask() implementation.

Reported-by: Michal Sojka <sojkam1@....cvut.cz>
Signed-off-by: Chris Metcalf <cmetcalf@...hip.com>
---
 arch/powerpc/include/asm/word-at-a-time.h | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/arch/powerpc/include/asm/word-at-a-time.h b/arch/powerpc/include/asm/word-at-a-time.h
index 5b3a903adae6..e4396a7d0f7c 100644
--- a/arch/powerpc/include/asm/word-at-a-time.h
+++ b/arch/powerpc/include/asm/word-at-a-time.h
@@ -40,6 +40,11 @@ static inline bool has_zero(unsigned long val, unsigned long *data, const struct
 	return (val + c->high_bits) & ~rhs;
 }
 
+static inline unsigned long zero_bytemask(unsigned long mask)
+{
+	return ~1ul << __fls(mask);
+}
+
 #else
 
 #ifdef CONFIG_64BIT
-- 
2.1.2

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