Messages in this thread | | | Date | Thu, 5 Oct 2023 19:04:14 +0200 | From | Oleg Nesterov <> | Subject | Re: [PATCH] blk-throttle: Calculate allowed value only when the throttle is enabled |
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sorry, didn't notice this part before.
I am not a asm expert (to say at least;) but
On 10/05, Li Nan wrote: > > When (a * mul) overflows, a divide 0 error occurs in > mul_u64_u64_div_u64().
Just in case... No, iirc it is divq which triggers #DE when the result of division doesn't fit u64.
(a * mul) can't overflow, the result is 128-bit rax:rdx number.
Oleg.
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