Thread (28 messages) 28 messages, 1 author, 2011-01-22
STALE5623d

[PATCH v5 10/27] bitops: introduce CONFIG_GENERIC_FIND_BIT_LE

From: Akinobu Mita <akinobu.mita@gmail.com>
Date: 2011-01-22 13:18:01
Also in: lkml
Subsystem: library code, linux for powerpc (32-bit and 64-bit), microblaze architecture, mips, parisc architecture, sparc + ultrasparc (sparc/sparc64), superh, tensilica xtensa port (xtensa), the rest · Maintainers: Andrew Morton, Madhavan Srinivasan, Michael Ellerman, Michal Simek, Thomas Bogendoerfer, "James E.J. Bottomley", Helge Deller, "David S. Miller", Andreas Larsson, Yoshinori Sato, Rich Felker, John Paul Adrian Glaubitz, Chris Zankel, Max Filippov, Linus Torvalds

This introduces CONFIG_GENERIC_FIND_BIT_LE to tell whether to use generic
implementation of find_*_bit_le() in lib/find_next_bit.c or not.

For now we select CONFIG_GENERIC_FIND_BIT_LE for all architectures which
enable CONFIG_GENERIC_FIND_NEXT_BIT.

But m68knommu wants to define own faster find_next_zero_bit_le() and
continues using generic find_next_{,zero_}bit().
(CONFIG_GENERIC_FIND_NEXT_BIT and !CONFIG_GENERIC_FIND_BIT_LE)

Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
Cc: Greg Ungerer <redacted>
Cc: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

Change from v4:
 - no changes

The whole series is available in the git branch at:
 git://git.kernel.org/pub/scm/linux/kernel/git/mita/linux-2.6.git le-bitops-v5

 arch/frv/Kconfig        |    4 ++++
 arch/h8300/Kconfig      |    4 ++++
 arch/m32r/Kconfig       |    4 ++++
 arch/m68knommu/Kconfig  |    4 ++++
 arch/microblaze/Kconfig |    3 +++
 arch/mips/Kconfig       |    4 ++++
 arch/parisc/Kconfig     |    4 ++++
 arch/powerpc/Kconfig    |    4 ++++
 arch/sh/Kconfig         |    3 +++
 arch/sparc/Kconfig      |    4 ++++
 arch/xtensa/Kconfig     |    3 +++
 lib/Kconfig             |    3 +++
 lib/Makefile            |    1 +
 lib/find_next_bit.c     |    3 +++
 14 files changed, 48 insertions(+), 0 deletions(-)
diff --git a/arch/frv/Kconfig b/arch/frv/Kconfig
index f6bcb03..e0764f0 100644
--- a/arch/frv/Kconfig
+++ b/arch/frv/Kconfig
@@ -21,6 +21,10 @@ config GENERIC_FIND_NEXT_BIT
 	bool
 	default y
 
+config GENERIC_FIND_BIT_LE
+	bool
+	default y
+
 config GENERIC_HWEIGHT
 	bool
 	default y
diff --git a/arch/h8300/Kconfig b/arch/h8300/Kconfig
index 65f897d8..552219f 100644
--- a/arch/h8300/Kconfig
+++ b/arch/h8300/Kconfig
@@ -43,6 +43,10 @@ config GENERIC_FIND_NEXT_BIT
 	bool
 	default y
 
+config GENERIC_FIND_BIT_LE
+	bool
+	default y
+
 config GENERIC_HWEIGHT
 	bool
 	default y
diff --git a/arch/m32r/Kconfig b/arch/m32r/Kconfig
index 5c291d6..b30cea3 100644
--- a/arch/m32r/Kconfig
+++ b/arch/m32r/Kconfig
@@ -265,6 +265,10 @@ config GENERIC_FIND_NEXT_BIT
 	bool
 	default y
 
+config GENERIC_FIND_BIT_LE
+	bool
+	default y
+
 config GENERIC_HWEIGHT
 	bool
 	default y
diff --git a/arch/m68knommu/Kconfig b/arch/m68knommu/Kconfig
index 704e7b9..5ba4f15 100644
--- a/arch/m68knommu/Kconfig
+++ b/arch/m68knommu/Kconfig
@@ -40,6 +40,10 @@ config GENERIC_FIND_NEXT_BIT
 	bool
 	default y
 
+config GENERIC_FIND_BIT_LE
+	bool
+	default y
+
 config GENERIC_GPIO
 	bool
 	default n
diff --git a/arch/microblaze/Kconfig b/arch/microblaze/Kconfig
index 5f5018a..102d986 100644
--- a/arch/microblaze/Kconfig
+++ b/arch/microblaze/Kconfig
@@ -34,6 +34,9 @@ config ARCH_HAS_ILOG2_U64
 config GENERIC_FIND_NEXT_BIT
 	def_bool y
 
+config GENERIC_FIND_BIT_LE
+	def_bool y
+
 config GENERIC_HWEIGHT
 	def_bool y
 
diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
index 548e6cc..72e3ba3 100644
--- a/arch/mips/Kconfig
+++ b/arch/mips/Kconfig
@@ -773,6 +773,10 @@ config GENERIC_FIND_NEXT_BIT
 	bool
 	default y
 
+config GENERIC_FIND_BIT_LE
+	bool
+	default y
+
 config GENERIC_HWEIGHT
 	bool
 	default y
diff --git a/arch/parisc/Kconfig b/arch/parisc/Kconfig
index 0888675..3aeaf16 100644
--- a/arch/parisc/Kconfig
+++ b/arch/parisc/Kconfig
@@ -48,6 +48,10 @@ config GENERIC_FIND_NEXT_BIT
 	bool
 	default y
 
+config GENERIC_FIND_BIT_LE
+	bool
+	default y
+
 config GENERIC_BUG
 	bool
 	default y
diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index 959f38c..b88d787 100644
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -107,6 +107,10 @@ config GENERIC_FIND_NEXT_BIT
 	bool
 	default y
 
+config GENERIC_FIND_BIT_LE
+	bool
+	default y
+
 config GENERIC_GPIO
 	bool
 	help
diff --git a/arch/sh/Kconfig b/arch/sh/Kconfig
index fff2522..6ee6d4b 100644
--- a/arch/sh/Kconfig
+++ b/arch/sh/Kconfig
@@ -73,6 +73,9 @@ config GENERIC_CSUM
 config GENERIC_FIND_NEXT_BIT
 	def_bool y
 
+config GENERIC_FIND_BIT_LE
+	def_bool y
+
 config GENERIC_HWEIGHT
 	def_bool y
 
diff --git a/arch/sparc/Kconfig b/arch/sparc/Kconfig
index 45d9c87..085a9b7 100644
--- a/arch/sparc/Kconfig
+++ b/arch/sparc/Kconfig
@@ -194,6 +194,10 @@ config GENERIC_FIND_NEXT_BIT
 	bool
 	default y
 
+config GENERIC_FIND_BIT_LE
+	bool
+	default y
+
 config GENERIC_HWEIGHT
 	bool
 	default y if !ULTRA_HAS_POPULATION_COUNT
diff --git a/arch/xtensa/Kconfig b/arch/xtensa/Kconfig
index d373d15..7283919 100644
--- a/arch/xtensa/Kconfig
+++ b/arch/xtensa/Kconfig
@@ -21,6 +21,9 @@ config RWSEM_XCHGADD_ALGORITHM
 config GENERIC_FIND_NEXT_BIT
 	def_bool y
 
+config GENERIC_FIND_BIT_LE
+	def_bool y
+
 config GENERIC_HWEIGHT
 	def_bool y
 
diff --git a/lib/Kconfig b/lib/Kconfig
index 0ee67e0..99b8008 100644
--- a/lib/Kconfig
+++ b/lib/Kconfig
@@ -22,6 +22,9 @@ config GENERIC_FIND_FIRST_BIT
 config GENERIC_FIND_NEXT_BIT
 	bool
 
+config GENERIC_FIND_BIT_LE
+	bool
+
 config GENERIC_FIND_LAST_BIT
 	bool
 	default y
diff --git a/lib/Makefile b/lib/Makefile
index cbb774f..865dc16 100644
--- a/lib/Makefile
+++ b/lib/Makefile
@@ -38,6 +38,7 @@ lib-$(CONFIG_RWSEM_GENERIC_SPINLOCK) += rwsem-spinlock.o
 lib-$(CONFIG_RWSEM_XCHGADD_ALGORITHM) += rwsem.o
 lib-$(CONFIG_GENERIC_FIND_FIRST_BIT) += find_next_bit.o
 lib-$(CONFIG_GENERIC_FIND_NEXT_BIT) += find_next_bit.o
+lib-$(CONFIG_GENERIC_FIND_BIT_LE) += find_next_bit.o
 obj-$(CONFIG_GENERIC_FIND_LAST_BIT) += find_last_bit.o
 
 CFLAGS_hweight.o = $(subst $(quote),,$(CONFIG_ARCH_HWEIGHT_CFLAGS))
diff --git a/lib/find_next_bit.c b/lib/find_next_bit.c
index 7667c3d..b0a8767 100644
--- a/lib/find_next_bit.c
+++ b/lib/find_next_bit.c
@@ -160,6 +160,7 @@ EXPORT_SYMBOL(find_first_zero_bit);
 #endif /* CONFIG_GENERIC_FIND_FIRST_BIT */
 
 #ifdef __BIG_ENDIAN
+#ifdef CONFIG_GENERIC_FIND_BIT_LE
 
 /* include/linux/byteorder does not support "unsigned long" type */
 static inline unsigned long ext2_swabp(const unsigned long * x)
@@ -273,4 +274,6 @@ found_middle_swap:
 	return result + __ffs(ext2_swab(tmp));
 }
 EXPORT_SYMBOL(find_next_bit_le);
+
+#endif /* CONFIG_GENERIC_FIND_BIT_LE */
 #endif /* __BIG_ENDIAN */
-- 
1.7.3.4
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