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Subject[PATCH v5 10/27] bitops: introduce CONFIG_GENERIC_FIND_BIT_LE
Date
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 <gerg@uclinux.org>
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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