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SubjectRe: [GIT pull] x86/urgent for v5.9-rc2
On Sun, Aug 30 2020 at 12:13, Linus Torvalds wrote:
> On Sun, Aug 30, 2020 at 11:04 AM Thomas Gleixner <> wrote:
>> The historical inconsistent for_each_cpu() behaviour of
>> ignoring the cpumask and unconditionally claiming that CPU0 is in the
>> mask struck again. Sigh.
> I guess we could remove the UP optimizations these days. It's not like
> they matter like they used to.


> Or leave the optimizations in the sense that they wouldn't do the
> crazy bit searching, but they could look at bit 0 of the mask they're
> passed..

Yes, that's trivial enough and the compiler should turn the whole thing
into a simple conditional checking bit 0 and remove the rest of the loop



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