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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 /init/Kconfig | |
| parent | ba1f14fbe70965ae0fb1655a5275a62723f65b77 (diff) | |
| download | lwn-be5e610c0fd6ef772cafb9e0bd4128134804aef3.tar.gz lwn-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 'init/Kconfig')
| -rw-r--r-- | init/Kconfig | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/init/Kconfig b/init/Kconfig index 79383d3aa5dc..4e5d96ab2034 100644 --- a/init/Kconfig +++ b/init/Kconfig @@ -809,6 +809,12 @@ config GENERIC_SCHED_CLOCK config ARCH_SUPPORTS_NUMA_BALANCING bool +# +# For architectures that know their GCC __int128 support is sound +# +config ARCH_SUPPORTS_INT128 + bool + # For architectures that (ab)use NUMA to represent different memory regions # all cpu-local but of different latencies, such as SuperH. # |