linux-kernel - Re: [PATCH 0/7] convert semaphore to mutex in struct class

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Message-ID: <a8e1da0801081732i3677245chef1fda1fea65f7cf@mail.gmail.com>
Date:	Wed, 9 Jan 2008 09:32:48 +0800
From:	"Dave Young" <hidave.darkstar@...il.com>
To:	"Greg KH" <gregkh@...e.de>
Cc:	"Stefan Richter" <stefanr@...6.in-berlin.de>,
	James.Bottomley@...senpartnership.com,
	dbrownell@...rs.sourceforge.net, linux-scsi@...r.kernel.org,
	a.zummo@...ertech.it, peterz@...radead.org, cbou@...l.ru,
	linux-kernel@...r.kernel.org,
	"David Brownell" <david-b@...bell.net>, krh@...hat.com,
	stern@...land.harvard.edu, rtc-linux@...glegroups.com,
	spi-devel-general@...ts.sourceforge.net,
	linux1394-devel@...ts.sourceforge.net, dwmw2@...radead.org,
	davem@...emloft.net, jarkao2@...il.com
Subject: Re: [PATCH 0/7] convert semaphore to mutex in struct class

On Jan 9, 2008 6:48 AM, Greg KH <gregkh@...e.de> wrote:
> On Tue, Jan 08, 2008 at 03:05:10PM +0800, Dave Young wrote:
> > On Jan 8, 2008 1:20 AM, Greg KH <gregkh@...e.de> wrote:
> > > On Mon, Jan 07, 2008 at 06:13:37PM +0100, Stefan Richter wrote:
> > > > It's already in the driver core to the most part.  It remains to be seen
> > > > what is less complicated in the end:  Transparent mutex-protected list
> > > > accesses provided by driver core (requires the iterator), or all the
> > > > necessary locking done by the drivers themselves (requires some more
> > > > lock-taking but perhaps fewer lock instances overall in the drivers, and
> > > > respective redefinitions and documentation of the driver core API).
> > >
> > > I favor changing the driver core api and doing this kind of thing there.
> > > It keeps the drivers simpler and should hopefully make their lives
> > > easier.
> >
> > What about this?
> >
> > #define class_for_each_dev(pos, head, member) \
> >         for (mutex_lock(&(container_of(head, struct class, devices))->mutex), po
> > s = list_entry((head)->next, typeof(*pos), member); \
> >         prefetch(pos->member.next), &pos->member != (head) ? 1 : (mutex_unlock(&
> > (container_of(head, struct class, devices))->mutex), 0); \
> >         pos = list_entry(pos->member.next, typeof(*pos), member))
>
I'm wrong, it's same as before indeed.

> Eeek, just make the thing a function please, where you pass the iterator
> function in, like the driver core has (driver_for_each_device)

Ok, so need a new member of knode_class, I will update the patch later.
Thanks.

>
> thanks,
>
> greg k-h
>
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