linux-kernel - [PATCH v4 23/24] m68k: remove inline asm from minix_find_first_zero

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Message-Id: <1295183333-13802-24-git-send-email-akinobu.mita@gmail.com>
Date:	Sun, 16 Jan 2011 22:08:52 +0900
From:	Akinobu Mita <akinobu.mita@...il.com>
To:	linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org,
	akpm@...ux-foundation.org
Cc:	Akinobu Mita <akinobu.mita@...il.com>,
	Geert Uytterhoeven <geert@...ux-m68k.org>,
	Roman Zippel <zippel@...ux-m68k.org>,
	Andreas Schwab <schwab@...ux-m68k.org>
Subject: [PATCH v4 23/24] m68k: remove inline asm from minix_find_first_zero_bit

As a preparation for moving minix bit operations from asm/bitops.h to
architecture independent code in minix file system, this removes inline
asm from minix_find_first_zero_bit() for m68k.

Signed-off-by: Akinobu Mita <akinobu.mita@...il.com>
Cc: Geert Uytterhoeven <geert@...ux-m68k.org>
Cc: Roman Zippel <zippel@...ux-m68k.org>
Cc: Andreas Schwab <schwab@...ux-m68k.org>
Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
---

Change from v3:
 - No change

The whole series is available in the git repository at:
 git://git.kernel.org/pub/scm/linux/kernel/git/mita/linux-2.6.git le-bitops-v4

 arch/m68k/include/asm/bitops_mm.h |   10 +++-------
 1 files changed, 3 insertions(+), 7 deletions(-)

diff --git a/arch/m68k/include/asm/bitops_mm.h b/arch/m68k/include/asm/bitops_mm.h
index fecd9f3..f6c7dea 100644
--- a/arch/m68k/include/asm/bitops_mm.h
+++ b/arch/m68k/include/asm/bitops_mm.h
@@ -330,23 +330,19 @@ static inline int __fls(int x)
 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)
-	{
+	while (*p++ == 0xffff) {
 		if (--size == 0)
 			return (p - addr) << 4;
 	}
 
-	num = ~*--p;
-	__asm__ __volatile__ ("bfffo %1{#16,#16},%0"
-			      : "=d" (res) : "d" (num & -num));
-	return ((p - addr) << 4) + (res ^ 31);
+	num = *--p;
+	return ((p - addr) << 4) + ffz(num);
 }
 
 #define minix_test_and_set_bit(nr, addr)	__test_and_set_bit((nr) ^ 16, (unsigned long *)(addr))
-- 
1.7.3.4

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