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authorPeter Zijlstra <peterz@infradead.org>2013-11-18 18:27:06 +0100
committerIngo Molnar <mingo@kernel.org>2013-12-11 15:52:34 +0100
commitbe5e610c0fd6ef772cafb9e0bd4128134804aef3 (patch)
tree4cc4da2eea52c51ce868944aba28edf171a2d871 /init
parentba1f14fbe70965ae0fb1655a5275a62723f65b77 (diff)
downloadlinux-be5e610c0fd6ef772cafb9e0bd4128134804aef3.tar.gz
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')
-rw-r--r--init/Kconfig6
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.
#