Re: [PATCH, RFC 1/3] Add sem_getcount() to arches that lack it

[Andrew Morton]

Jody McIntyre <scjody@xxxxxxxxxxxxxx> wrote:
>
> parisc and frv define sem_getcount() in semaphore.h, which returns the
>  current semaphore value.  This is cleaner than doing
>  atomic_read(&semaphore.count), currently done in
>  drivers/ieee1394/nodemgr.c and fs/xfs/linux-2.6/xfs_buf.c, and will work
>  on all architectures if sem_getcount() is added.

That's a fairly bizarre thing to want to do.  Would it be hard to modify
xfs and 1394 to stop wanting to read a semaphore's up() count?

(Why do they want to do this anyway?)
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