Messages in this thread | | | Date | Thu, 10 Mar 2022 00:04:50 -0800 | From | Christoph Hellwig <> | Subject | Re: [PATCH] riscv: Work to remove kernel dependence on the M-extension |
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On Wed, Mar 09, 2022 at 11:34:25PM -0800, Palmer Dabbelt wrote: > If someone has hardware that lacks M and users care about running Linux on > that then I'm happy to support it. I'll still point out the silliness of > that decision, but if it's too late to change things then I'd rather support > the hardware. If it's one of these "fill out every possible allowed ISA > flavor, even if nobody has one that runs Linux" then I don't see a reason to > bother -- there's an infinite amount of allowable RISC-V implementations, > we'll all go crazy chasing them around.
It's not like Linux had required M mode since the RISC-V port was merged upstream, so any new implementor really should know about it. And performance on anything that requires Linux will just be horrible. I could see a bit of an excuse for a nommu port.
Anyway, this kind of patch really does need to state the why. And it better be a really good reason.
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