linux-kernel - Re: 64-bit ppc rwsem

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Date:	Tue, 24 Aug 2010 14:06:38 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
Cc:	David Miller <davem@...emloft.net>, linuxppc-dev@...ts.ozlabs.org,
	torvalds@...ux-foundation.org, paulus@...ibm.com,
	linux-kernel@...r.kernel.org, sparclinux@...r.kernel.org,
	akpm@...ux-foundation.org
Subject: Re: 64-bit ppc rwsem

On Tuesday 24 August 2010, Benjamin Herrenschmidt wrote:
> On Mon, 2010-08-23 at 15:18 -0700, David Miller wrote:
> > > I've seen drivers in the past do trylocks at interrupt time ... tho
> > I
> > > agree it sucks.
> > 
> > Recently there was a thread where this was declared absolutely
> > illegal.
> > 
> > Maybe it was allowed, or sort-of worked before, and that's why it's
> > accounted for with IRQ disables in some implementations.  I don't
> > know. 
> 
> Ok, I'm happy to say it's a big no-no then.
> 
> Arnd, do you want to take over the moving to asm-generic and take care
> of the spinlock case as well ? I can send Linus the first patch that
> changes powerpc to use atomic_long now along with a few other things I
> have pending, then you can pickup from there. Or do you want me to
> continue pushing my patch as-is and we can look at cleaning up the
> spinlock case separately ?

I'm currently doing too many things at once, please push in your existing
patch for now, we can continue from there.

For the asm-generic patch:
Acked-by: Arnd Bergmann <arnd@...db.de>
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