linux-toradex.git/arch/arm/include/asm/bitops.h, branch v3.3.5

asm-generic: add another generic ext2 atomic bitops

2011-07-26T23:49:46+00:00

The majority of architectures implement ext2 atomic bitops as
test_and_{set,clear}_bit() without spinlock.

This adds this type of generic implementation in ext2-atomic-setbit.h and
use it wherever possible.

Signed-off-by: Akinobu Mita 
Suggested-by: Andreas Dilger 
Suggested-by: Arnd Bergmann 
Acked-by: Arnd Bergmann 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

ARM: 6998/2: kernel: use proper memory barriers for bitops

2011-07-22T09:16:27+00:00

Improve scalability by avoiding costly and unnecessary L2 cache sync
in handling bitops.

Signed-off-by: Heechul Yun 
Acked-by: Catalin Marinas 
Signed-off-by: Russell King

arm: use asm-generic/bitops/le.h

2011-05-27T00:12:38+00:00

The previous style change enables to use asm-generic/bitops/le.h on arm.

Signed-off-by: Akinobu Mita 
Acked-by: Russell King 
Cc: Arnd Bergmann 
Cc: Martin Schwidefsky 
Cc: Heiko Carstens 
Cc: Greg Ungerer 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

arch: add #define for each of optimized find bitops

2011-05-27T00:12:38+00:00

The style that we normally use in asm-generic is to test the macro itself
for existence, so in asm-generic, do:

	#ifndef find_next_zero_bit_le
	extern unsigned long find_next_zero_bit_le(const void *addr,
		unsigned long size, unsigned long offset);
	#endif

and in the architectures, write

	static inline unsigned long find_next_zero_bit_le(const void *addr,
		unsigned long size, unsigned long offset)
	#define find_next_zero_bit_le find_next_zero_bit_le

This adds the #define for each of the optimized find bitops in the
architectures.

Suggested-by: Arnd Bergmann 
Signed-off-by: Akinobu Mita 
Acked-by: Hans-Christian Egtvedt 
Acked-by: Russell King 
Acked-by: Greg Ungerer 
Cc: Martin Schwidefsky 
Cc: Heiko Carstens 
Acked-by: Geert Uytterhoeven 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

bitops: remove minix bitops from asm/bitops.h

2011-03-24T02:46:22+00:00

minix bit operations are only used by minix filesystem and useless by
other modules.  Because byte order of inode and block bitmaps is different
on each architecture like below:

m68k:
	big-endian 16bit indexed bitmaps

h8300, microblaze, s390, sparc, m68knommu:
	big-endian 32 or 64bit indexed bitmaps

m32r, mips, sh, xtensa:
	big-endian 32 or 64bit indexed bitmaps for big-endian mode
	little-endian bitmaps for little-endian mode

Others:
	little-endian bitmaps

In order to move minix bit operations from asm/bitops.h to architecture
independent code in minix filesystem, this provides two config options.

CONFIG_MINIX_FS_BIG_ENDIAN_16BIT_INDEXED is only selected by m68k.
CONFIG_MINIX_FS_NATIVE_ENDIAN is selected by the architectures which use
native byte order bitmaps (h8300, microblaze, s390, sparc, m68knommu,
m32r, mips, sh, xtensa).  The architectures which always use little-endian
bitmaps do not select these options.

Finally, we can remove minix bit operations from asm/bitops.h for all
architectures.

Signed-off-by: Akinobu Mita 
Acked-by: Arnd Bergmann 
Acked-by: Greg Ungerer 
Cc: Geert Uytterhoeven 
Cc: Roman Zippel 
Cc: Andreas Schwab 
Cc: Martin Schwidefsky 
Cc: Heiko Carstens 
Cc: Yoshinori Sato 
Cc: Michal Simek 
Cc: "David S. Miller" 
Cc: Hirokazu Takata 
Acked-by: Ralf Baechle 
Acked-by: Paul Mundt 
Cc: Chris Zankel 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

bitops: remove ext2 non-atomic bitops from asm/bitops.h

2011-03-24T02:46:21+00:00

As the result of conversions, there are no users of ext2 non-atomic bit
operations except for ext2 filesystem itself.  Now we can put them into
architecture independent code in ext2 filesystem, and remove from
asm/bitops.h for all architectures.

Signed-off-by: Akinobu Mita 
Cc: Jan Kara 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

arm: introduce little-endian bitops

2011-03-24T02:46:13+00:00

Introduce little-endian bit operations by renaming native ext2 bit
operations.  The ext2 and minix bit operations are kept as wrapper macros
using little-endian bit operations to maintain bisectability until the
conversions are finished.

Signed-off-by: Akinobu Mita 
Cc: Russell King 
Cc: "H. Peter Anvin" 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

ARM: bitops: switch set/clear/change bitops to use ldrex/strex

2011-02-02T21:23:25+00:00

Switch the set/clear/change bitops to use the word-based exclusive
operations, which are only present in a wider range of ARM architectures
than the byte-based exclusive operations.

Tested record:
- Nicolas Pitre: ext3,rw,le
- Sourav Poddar: nfs,le
- Will Deacon: ext3,rw,le
- Tony Lindgren: ext3+nfs,le

Reviewed-by: Nicolas Pitre 
Tested-by: Sourav Poddar 
Tested-by: Will Deacon 
Tested-by: Tony Lindgren 
Signed-off-by: Russell King

ARM: 6621/1: bitops: remove condition code clobber for CLZ

2011-01-12T14:22:25+00:00

The CLZ instruction does not alter the condition flags, so remove the
"cc" clobber from the inline asm for fls().

Acked-by: Nicolas Pitre 
Signed-off-by: Rabin Vincent 
Signed-off-by: Russell King

ARM: boolean bit testing

2009-10-11T15:25:06+00:00

Bit testing (test, testset, testclear, testchange) for bit numbers
known at compile time returns a word with the tested-for bit set.

Change it to return a true boolean value so to make it consistent with
the out-of-line path and all the other bitops implementations.

Signed-off-by: Johannes Weiner 
Signed-off-by: Russell King