From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
To: David Miller <davem@davemloft.net>
Cc: arnd@arndb.de, linuxppc-dev@lists.ozlabs.org,
torvalds@linux-foundation.org, paulus@au.ibm.com,
linux-kernel@vger.kernel.org, sparclinux@vger.kernel.org,
akpm@linux-foundation.org
Subject: Re: 64-bit ppc rwsem
Date: Tue, 24 Aug 2010 11:31:17 +1000 [thread overview]
Message-ID: <1282613477.22370.485.camel@pasglop> (raw)
In-Reply-To: <20100823.151853.108794567.davem@davemloft.net>
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.
next prev parent reply other threads:[~2010-08-24 1:31 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-08-18 1:03 [GIT] Sparc David Miller
2010-08-18 1:31 ` Linus Torvalds
2010-08-18 1:59 ` Linus Torvalds
2010-08-18 2:14 ` David Miller
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 [this message]
2010-08-24 12:06 ` Arnd Bergmann
2010-08-18 2:12 ` [GIT] Sparc David Miller
2010-08-18 2:50 ` Al Viro
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