* Andy Lutomirski <[email protected]> wrote:
> We were asserting that we were all the way in CONTEXT_KERNEL when exception
> handlers were called. While having this be true is, I think, a nice goal (or
> maybe a variant in which we assert that we're in CONTEXT_KERNEL or some new
> IRQ
> context), we're not quite there.
>
> In particular, if an IRQ interrupts the SYSCALL prologue and the IRQ handler
> in
> turn causes an exception, the exception entry will be called in RCU IRQ mode
> but
> with CONTEXT_USER.
Hm, so what harm would there be in making IRQ handlers enter CONTEXT_KERNEL?
Would nohz-full break?
I'd rather have a bit more tracking overhead here than lose such useful sanity
checks.
Thanks,
Ingo
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