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    SubjectRe: [PATCH 2/4] ceph: fix buffer free while holding i_ceph_lock in __ceph_setxattr()
    On Fri, Jul 19, 2019 at 07:07:49PM -0400, Jeff Layton wrote:

    > Al pointed out on IRC that vfree should be callable under spinlock.

    Al had been near-terminally low on caffeine at the time, posted
    a retraction a few minutes later and went to grab some coffee...

    > It
    > only sleeps if !in_interrupt(), and I think that should return true if
    > we're holding a spinlock.

    It can be used from RCU callbacks and all such; it *can't* be used from
    under spinlock - on non-preempt builds there's no way to recognize that.

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