From: Arnd Bergmann <arnd@arndb•de>
To: Benjamin Herrenschmidt <benh@kernel•crashing.org>
Cc: linuxppc-dev@lists•ozlabs.org, paulus@au•ibm.com,
linux-kernel@vger•kernel.org, sparclinux@vger•kernel.org,
akpm@linux-foundation•org, torvalds@linux-foundation•org,
David Miller <davem@davemloft•net>
Subject: Re: 64-bit ppc rwsem
Date: Tue, 24 Aug 2010 14:06:38 +0200 [thread overview]
Message-ID: <201008241406.38539.arnd@arndb.de> (raw)
In-Reply-To: <1282613477.22370.485.camel@pasglop>
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@arndb•de>
prev parent reply other threads:[~2010-08-24 12:07 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20100817.180325.104051399.davem@davemloft.net>
[not found] ` <AANLkTikQ1dGw0aO10_ZwmVEc-JAVhB==3HS7SrWycE49@mail.gmail.com>
[not found] ` <AANLkTimZ3rhX2AzPExEGfRCXiFNN-BGOWRKqL241-qNa@mail.gmail.com>
[not found] ` <20100817.191424.183031381.davem@davemloft.net>
2010-08-18 4:38 ` 64-bit ppc rwsem (was: Re: [GIT] Sparc) Benjamin Herrenschmidt
2010-08-18 5:03 ` Benjamin Herrenschmidt
2010-08-18 5:28 ` 64-bit ppc rwsem David Miller
2010-08-18 5:39 ` Sam Ravnborg
2010-08-18 5:48 ` David Miller
2010-08-19 5:23 ` Benjamin Herrenschmidt
2010-08-19 5:29 ` David Miller
2010-08-19 10:24 ` Benjamin Herrenschmidt
2010-08-20 5:14 ` [PATCH 2/2] rwsem: Move powerpc atomic-long based implementation to asm-generic Benjamin Herrenschmidt
2010-08-20 6:43 ` Sam Ravnborg
2010-08-24 1:32 ` Benjamin Herrenschmidt
2010-08-23 4:39 ` David Miller
2010-08-20 5:14 ` [PATCH 1/2] powerpc: Make rwsem use "long" type Benjamin Herrenschmidt
2010-08-24 1:37 ` Timur Tabi
2010-08-23 13:44 ` 64-bit ppc rwsem Arnd Bergmann
2010-08-23 22:01 ` Benjamin Herrenschmidt
2010-08-23 22:18 ` David Miller
2010-08-24 1:31 ` Benjamin Herrenschmidt
2010-08-24 12:06 ` Arnd Bergmann [this message]
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