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SubjectRe: [GIT pull] sched/urgent for v5.9-rc2
On Sun, Aug 30, 2020 at 11:54:19AM -0700, Linus Torvalds wrote:
> On Sun, Aug 30, 2020 at 11:04 AM Thomas Gleixner <tglx@linutronix.de> wrote:
> >
> > - Make is_idle_task() __always_inline to prevent the compiler from putting
> > it out of line into the wrong section because it's used inside noinstr
> > sections.
>
> What completely broken compiler uninlined that single-instruction function?
>
> I've obviously pulled this, but it sounds like there should be a
> compiler bug-report for this insane behavior.
>
> Or is Marco building the kernel without optimizations or something
> like that? That has not been a supported model, for various good
> reasons..

I think that was Clang with KCSAN on, KCSAN obviously makes this
function a little bigger with the instrumentation for the load(s). But
yes...

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