Re: [PATCH 1/6] mlock: only hold mmap_sem in shared mode when

[George Spelvin]

How about (bugfixed):

bool cond_break_mutex(struct mutex *mutex)
{
	if (!mutex_is_contended(mutex))
		return false;
	mutex_unlock(mutex);
	mutex_lock(mutex);
	return true;
}

It would be possible to share work between the unlock and lock slowpaths
(particularly the wait_lock acquisition), but that's probably more
maintenance effort than it's worth.
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