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
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 i
From: Benjamin Herrenschmidt
Date: Tue, 24 Aug 2010 08:01:25 +1000
> On Mon, 2010-08-23 at 15:44 +0200, Arnd Bergmann wrote:
>>
>> * Alpha has an optimization for the uniprocessor case, where the atomic
>> instructions get turned into nonatomic additions. The spinlock based
>> version uses no lo
On Mon, 2010-08-23 at 15:44 +0200, Arnd Bergmann wrote:
>
> * Alpha has an optimization for the uniprocessor case, where the atomic
> instructions get turned into nonatomic additions. The spinlock based
> version uses no locks on UP but disables interrupts for reasons I don't
> understand (nothing
On Thursday 19 August 2010, David Miller wrote:
> From: Benjamin Herrenschmidt
> Date: Thu, 19 Aug 2010 15:23:23 +1000
>
> > Similar here, but using atomic_long_t instead so it works for 32-bit too
> > for me. I suppose we could make that part common indeed.
> >
> > What about asm-generic/rwsem-
On Wed, 2010-08-18 at 22:29 -0700, David Miller wrote:
> From: Benjamin Herrenschmidt
> Date: Thu, 19 Aug 2010 15:23:23 +1000
>
> > Similar here, but using atomic_long_t instead so it works for 32-bit too
> > for me. I suppose we could make that part common indeed.
> >
> > What about asm-generic
From: Benjamin Herrenschmidt
Date: Thu, 19 Aug 2010 15:23:23 +1000
> Similar here, but using atomic_long_t instead so it works for 32-bit too
> for me. I suppose we could make that part common indeed.
>
> What about asm-generic/rwsem-atomic.h or rwsem-cmpxchg.h ?
Using rwsem-cmpxchg.h sounds b
On Tue, 2010-08-17 at 22:28 -0700, David Miller wrote:
> From: Benjamin Herrenschmidt
> Date: Wed, 18 Aug 2010 15:03:23 +1000
>
> > I tried various tricks but so far they didn't work. I'll have another
> > look tomorrow, but I may end up having to keep all the crap typecasts.
>
> The casts are p
From: Sam Ravnborg
Date: Wed, 18 Aug 2010 07:39:55 +0200
>> @@ -15,7 +15,7 @@ lib-$(CONFIG_SPARC32) += divdi3.o udivdi3.o
>> lib-$(CONFIG_SPARC32) += copy_user.o locks.o
>> lib-y += atomic_$(BITS).o
>> lib-$(CONFIG_SPARC32) += lshrdi3.o ashldi3.o
>> -lib-y += rw
> diff --git a/arch/sparc/lib/Makefile b/arch/sparc/lib/Makefile
> index c4b5e03..fa4c3ea 100644
> --- a/arch/sparc/lib/Makefile
> +++ b/arch/sparc/lib/Makefile
> @@ -15,7 +15,7 @@ lib-$(CONFIG_SPARC32) += divdi3.o udivdi3.o
> lib-$(CONFIG_SPARC32) += copy_user.o locks.o
> lib-y +
From: Benjamin Herrenschmidt
Date: Wed, 18 Aug 2010 15:03:23 +1000
> I tried various tricks but so far they didn't work. I'll have another
> look tomorrow, but I may end up having to keep all the crap typecasts.
The casts are pretty much unavoidable.
Here's what I'm going to end up using on spa
On Wed, 2010-08-18 at 14:38 +1000, Benjamin Herrenschmidt wrote:
>
> Here's an untested patch for the folks on linuxppc-dev to look at,
> I'll
> review my own stuff & test tomorrow.
Allright, gcc's being a pain, and atomics are a struct so we can't that
easily assign.
I tried various tricks but
12 matches
Mail list logo
