linux-kernel - [PATCH 21/22] m68k: convert minix bitops to use little endian bitops

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Date:	Fri, 15 Oct 2010 18:46:20 +0900
From:	Akinobu Mita <akinobu.mita@...il.com>
To:	linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org,
	Arnd Bergmann <arnd@...db.de>,
	Christoph Hellwig <hch@...radead.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Akinobu Mita <akinobu.mita@...il.com>,
	Geert Uytterhoeven <geert@...ux-m68k.org>,
	Roman Zippel <zippel@...ux-m68k.org>,
	linux-m68k@...r.kernel.org
Subject: [PATCH 21/22] m68k: convert minix bitops to use little endian bitops

The inode and block bitmap for minix filesystem is little endian
byte order on m68k. This converts them to use little endian bit
operations.

Signed-off-by: Akinobu Mita <akinobu.mita@...il.com>
Cc: Geert Uytterhoeven <geert@...ux-m68k.org>
Cc: Roman Zippel <zippel@...ux-m68k.org>
Cc: linux-m68k@...ts.linux-m68k.org
---
 arch/m68k/include/asm/bitops_mm.h |   38 ++++++++----------------------------
 1 files changed, 9 insertions(+), 29 deletions(-)

diff --git a/arch/m68k/include/asm/bitops_mm.h b/arch/m68k/include/asm/bitops_mm.h
index e2cc3be..2451f7f 100644
--- a/arch/m68k/include/asm/bitops_mm.h
+++ b/arch/m68k/include/asm/bitops_mm.h
@@ -327,37 +327,17 @@ static inline int __fls(int x)
 
 /* Bitmap functions for the minix filesystem */
 
-static inline int minix_find_first_zero_bit(const void *vaddr, unsigned size)
-{
-	const unsigned short *p = vaddr, *addr = vaddr;
-	int res;
-	unsigned short num;
-
-	if (!size)
-		return 0;
-
-	size = (size >> 4) + ((size & 15) > 0);
-	while (*p++ == 0xffff)
-	{
-		if (--size == 0)
-			return (p - addr) << 4;
-	}
+#define minix_find_first_zero_bit(vaddr, size)	\
+	find_first_zero_le_bit(vaddr, (size))
 
-	num = ~*--p;
-	__asm__ __volatile__ ("bfffo %1{#16,#16},%0"
-			      : "=d" (res) : "d" (num & -num));
-	return ((p - addr) << 4) + (res ^ 31);
-}
+#define minix_test_and_set_bit(nr, addr)	\
+	__test_and_set_le_bit((nr), (unsigned long *)(addr))
+#define minix_set_bit(nr, addr)	\
+	__set_le_bit((nr), (unsigned long *)(addr))
+#define minix_test_and_clear_bit(nr, addr)	\
+	__test_and_clear_le_bit((nr), (unsigned long *)(addr))
 
-#define minix_test_and_set_bit(nr, addr)	__test_and_set_bit((nr) ^ 16, (unsigned long *)(addr))
-#define minix_set_bit(nr,addr)			__set_bit((nr) ^ 16, (unsigned long *)(addr))
-#define minix_test_and_clear_bit(nr, addr)	__test_and_clear_bit((nr) ^ 16, (unsigned long *)(addr))
-
-static inline int minix_test_bit(int nr, const void *vaddr)
-{
-	const unsigned short *p = vaddr;
-	return (p[nr >> 4] & (1U << (nr & 15))) != 0;
-}
+#define minix_test_bit(nr, addr)	test_le_bit(nr, addr)
 
 /* Bitmap functions for little endian. */
 
-- 
1.7.1.231.gd0b16

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