x86, bitops: select the generic bitmap search functions

Introduce GENERIC_FIND_FIRST_BIT and GENERIC_FIND_NEXT_BIT in
lib/Kconfig, defaulting to off. An arch that wants to use the
generic implementation now only has to use a select statement
to include them.

I added an always-y option (X86_CPU) to arch/x86/Kconfig.cpu
and used that to select the generic search functions. This
way ARCH=um SUBARCH=i386 automatically picks up the change
too, and arch/um/Kconfig.i386 can therefore be simplified a
bit. ARCH=um SUBARCH=x86_64 does things differently, but
still compiles fine. It seems that a "def_bool y" always
wins over a "def_bool n"?
Signed-off-by: NAlexander van Heukelum <heukelum@fastmail.fm>
Signed-off-by: NIngo Molnar <mingo@elte.hu>

arch/um/Kconfig.i386

@@ -39,14 +39,6 @@ config ARCH_REUSE_HOST_VSYSCALL_AREA
 	bool
 	default y
 
-config GENERIC_FIND_FIRST_BIT
-	bool
-	default y
-
-config GENERIC_FIND_NEXT_BIT
-	bool
-	default y
-
 config GENERIC_HWEIGHT
 	bool
 	default y

arch/um/Kconfig.x86_64

@@ -34,14 +34,6 @@ config SMP_BROKEN
 	bool
 	default y
 
-config GENERIC_FIND_FIRST_BIT
-	bool
-	default y
-
-config GENERIC_FIND_NEXT_BIT
-	bool
-	default y
-
 config GENERIC_HWEIGHT
 	bool
 	default y

arch/x86/Kconfig

@@ -77,12 +77,6 @@ config GENERIC_BUG
 	def_bool y
 	depends on BUG
 
-config GENERIC_FIND_FIRST_BIT
-	def_bool y
-
-config GENERIC_FIND_NEXT_BIT
-	def_bool y
-
 config GENERIC_HWEIGHT
 	def_bool y
 

arch/x86/Kconfig.cpu

@@ -278,6 +278,11 @@ config GENERIC_CPU
 
 endchoice
 
+config X86_CPU
+	def_bool y
+	select GENERIC_FIND_FIRST_BIT
+	select GENERIC_FIND_NEXT_BIT
+
 config X86_GENERIC
 	bool "Generic x86 support"
 	depends on X86_32

lib/Kconfig

@@ -7,6 +7,12 @@ menu "Library routines"
 config BITREVERSE
 	tristate
 
+config GENERIC_FIND_FIRST_BIT
+	def_bool n
+
+config GENERIC_FIND_NEXT_BIT
+	def_bool n
+
 config CRC_CCITT
 	tristate "CRC-CCITT functions"
 	help