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From: Andrew Morton <akpm@osdl.org>
To: Jody McIntyre <scjody@modernduck.com>
Cc: linux-kernel@vger.kernel.org, willy@debian.org,
	Nathan Scott <nathans@sgi.com>
Subject: Re: [PATCH, RFC 1/3] Add sem_getcount() to arches that lack it
Date: Thu, 10 Mar 2005 20:55:03 -0800	[thread overview]
Message-ID: <20050310205503.6151ab83.akpm@osdl.org> (raw)
In-Reply-To: <20050311000646.GJ1111@conscoop.ottawa.on.ca>

Jody McIntyre <scjody@modernduck.com> 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?)

  parent reply	other threads:[~2005-03-11  4:55 UTC|newest]

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2005-03-11  0:06 [PATCH, RFC 1/3] Add sem_getcount() to arches that lack it Jody McIntyre
2005-03-11  0:08 ` [PATCH, RFC 2/3] Use sem_getcount in ieee1394 Jody McIntyre
2005-03-11  0:10 ` [PATCH, RFC 3/3] Use sem_getcount in xfs Jody McIntyre
2005-03-11  4:55 ` Andrew Morton [this message]
2005-03-11  5:10   ` [PATCH, RFC 1/3] Add sem_getcount() to arches that lack it Roland Dreier
2005-03-11  5:18     ` Nathan Scott
2005-03-11  5:31   ` Jody McIntyre
2005-03-11  5:56     ` Andrew Morton
2005-03-11 12:27       ` Matthew Wilcox
2005-03-11 17:04         ` Jody McIntyre
2005-03-16 19:27           ` [PATCH, RFC 1/4] Rename semaphore count variable to be arch specific Jody McIntyre
2005-03-16 19:28             ` [PATCH, RFC 2/4] Add sem_getcount on arches that lack it Jody McIntyre
2005-03-16 19:28             ` [PATCH, RFC 3/4] Use sem_getcount in XFS Jody McIntyre
2005-03-16 19:31             ` [PATCH, RFC 4/4] Use sem_getcount in ieee1394 Jody McIntyre

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