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x86, bitops: select the generic bitmap search functions

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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: Alexander van Heukelum <heukelum@fastmail.fm>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Alexander van Heukelum
2008-04-25 13:12:53 +02:00
committed by Ingo Molnar
parent f19dcf4a61
commit 19870def58
5 changed files with 11 additions and 22 deletions
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arch/x86/Kconfig.cpu
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@@ -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