On Tue, Sep 19 2023 at 10:25, Linus Torvalds wrote:
PeterZ mentioned the generic entry code, which does this for the entry
path. But it actually goes much deeper: just do a
git grep preempt_disable arch/x86/kernel
and then do the same for some other architectures.
Looking at alpha, for example, there *are* hits for it, so at least
some of the code there clearly *tries* to do it. But does it cover all
the required parts? If it's never been tested, I'd be surprised if
it's all just ready to go.
Interestingly enough m68k has zero instances, but it supports PREEMPT on
the COLDFIRE subarchitecture...
