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| author |   Peter Zijlstra <peterz@infradead.org> | 2013-11-18 18:27:06 +0100 |
|---|---|---|
| committer |   Ingo Molnar <mingo@kernel.org> | 2013-12-11 15:52:34 +0100 |
| commit | be5e610c0fd6ef772cafb9e0bd4128134804aef3 (patch) | |
| tree | 4cc4da2eea52c51ce868944aba28edf171a2d871 /arch | |
| parent | sched: Remove PREEMPT_NEED_RESCHED from generic code (diff) | |
| download | linux-dev-be5e610c0fd6ef772cafb9e0bd4128134804aef3.tar.xz linux-dev-be5e610c0fd6ef772cafb9e0bd4128134804aef3.zip | |
math64: Add mul_u64_u32_shr()
Introduce mul_u64_u32_shr() as proposed by Andy a while back; it
allows using 64x64->128 muls on 64bit archs and recent GCC
which defines __SIZEOF_INT128__ and __int128.
(This new method will be used by the scheduler.)
Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Cc: fweisbec@gmail.com
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Link: http://lkml.kernel.org/n/tip-hxjoeuzmrcaumR0uZwjpe2pv@git.kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/x86/Kconfig | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig index e903c71f7e69..0952ecd60eca 100644 --- a/arch/x86/Kconfig +++ b/arch/x86/Kconfig @@ -26,6 +26,7 @@ config X86 select HAVE_AOUT if X86_32 select HAVE_UNSTABLE_SCHED_CLOCK select ARCH_SUPPORTS_NUMA_BALANCING + select ARCH_SUPPORTS_INT128 if X86_64 select ARCH_WANTS_PROT_NUMA_PROT_NONE select HAVE_IDE select HAVE_OPROFILE |