x86/math64: Provide a sane mul_u64_u32_div() implementation for x86_64

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On x86_64 we can do a u64 * u64 -> u128 widening multiply followed by
a u128 / u64 -> u64 division to implement a sane version of
mul_u64_u32_div().

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@kernel.org>

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Peter Zijlstra 2019-08-28 17:39:46 +02:00 • committed by Ingo Molnar

parent 089cf7f6ec

commit db4e919d9a

1 changed files with 13 additions and 0 deletions

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arch/x86/include/asm/div64.h

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