linux-kernel - [PATCH v2 21/22] m68k: remove inline asm from minix_find_first_zero

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Message-Id: <1287672077-5797-22-git-send-email-akinobu.mita@gmail.com>
Date:	Thu, 21 Oct 2010 23:41:16 +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>,
	Andreas Schwab <schwab@...ux-m68k.org>,
	linux-m68k@...ts.linux-m68k.org
Subject: [PATCH v2 21/22] 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>
Cc: linux-m68k@...ts.linux-m68k.org
---
First submission

 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 831d626..f31ed5a 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))
-- 
1.7.1.231.gd0b16

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