[PATCH] Define __PTHREAD_MUTEX_HAVE_PREV only if undefined [BZ #22298]

[Andreas Schwab]

On Okt 16 2017, "H.J. Lu" <hjl.tools@gmail.com> wrote:

> Here __x86_64__ == __PTHREAD_MUTEX_HAVE_PREV,  which ties
> __PTHREAD_MUTEX_HAVE_PREV with __nusers and __PTHREAD_SPINS.

That's what I would call related by chance.  The position of __nusers
differs only because __kind must not be moved, and that difference
existed already before the introduction of __prev and __next.

Andreas.

-- 
Andreas Schwab, SUSE Labs, schwab@suse.de
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