On Wed, 29 May 2002, Peter Wemm wrote:

> M_NOWAIT to the mbuf m_get*, malloc*, contigmalloc*, uma_* etc means
> "you must not tsleep!".  M_WAITOK conversely means that tsleep should be
> called as needed.  Things like malloc still can return NULL even with M_WAITOK
> for non-recoverable scenarios.

malloc() itself can't do this, unless malloc(M_WAITOK) has been broken.
Thousands of callers depend on malloc(M_WAITOK) not returning NULL,
and malloc.9 still documents this behaviour.  You may be thinking of
mbuf allocation.  It is confusingly different, starting with the no-wait
flag being spelled differently (M_NOWAIT).


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