On Wed, 21 Sep 2005, Andrew Morton wrote:
>
> There's an extremely special-case in the pagefault handlers where we fail
> the fault if in_atomic(). It's unrelated to spinlocks (spinlocks don't
> even cause in_atomic() to become true if !CONFIG_PREEMPT).
There's a few other places where we use those semantics, though.
Like "get_futex_value_locked()".
> So I think this change is only needed if UML implements kmap_atomic, as in
> arch/i386/mm/highmem.c, which it surely does not do?
No. Every architecture needs to honor it, or they are screwed.
Linus
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