linux-kernel - Re: 64-bit ppc rwsem

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Date:	Tue, 24 Aug 2010 11:31:17 +1000
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	David Miller <davem@...emloft.net>
Cc:	arnd@...db.de, 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 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 ?

Cheers,
Ben.

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