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    SubjectRe: [RFC-PATCH 2/4] mm: Add __rcu_alloc_page_lockless() func.
    On Thu, Sep 24, 2020 at 10:16:14AM +0200, Uladzislau Rezki wrote:
    > Other option is if we had unconditionally enabled PREEMPT_COUNT config.
    > It would be easy to identify a context type and invoke a page allocator
    > if a context is preemtale. But as of now preemptable() is "half" working.
    > Thomas uploaded patches to make it unconditional. But it can be blocked.

    While I in principle support Thomas' patch, I think this is an abuse and
    still complete wrong.

    Not all preemptible() context can deal with GFP_KERNEL (GFP_NOFS
    existing should be a clue). !preemptible context cannot unconditionally
    deal with GFP_NOWAIT, consider using it while holding zone->lock.

    The preemption context does not say antying much useful about the
    allocation context.

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