On Wed, May 22, 2013 at 04:04:48PM +0200, Arnd Bergmann wrote:
> On Wednesday 22 May 2013, Russell King - ARM Linux wrote:
> > On Wed, May 22, 2013 at 11:25:36AM +0200, Arnd Bergmann wrote:
> > > Given the most commonly used functions and a couple of architectures
> > > I'm familiar with, these are
On Wednesday 22 May 2013, Russell King - ARM Linux wrote:
> On Wed, May 22, 2013 at 11:25:36AM +0200, Arnd Bergmann wrote:
> > Given the most commonly used functions and a couple of architectures
> > I'm familiar with, these are the ones that currently call might_fault()
> >
> >
On Wed, May 22, 2013 at 11:25:36AM +0200, Arnd Bergmann wrote:
> Given the most commonly used functions and a couple of architectures
> I'm familiar with, these are the ones that currently call might_fault()
>
> x86-32 x86-64 arm arm64 powerpc s390generic
> copy_t
On Wed, May 22, 2013 at 02:07:29PM +0300, Michael S. Tsirkin wrote:
> On Wed, May 22, 2013 at 12:19:16PM +0200, Peter Zijlstra wrote:
> > On Wed, May 22, 2013 at 11:25:36AM +0200, Arnd Bergmann wrote:
> > > Calling might_fault() for every __get_user/__put_user is rather expensive
> > > because it t
On Wed, May 22, 2013 at 12:19:16PM +0200, Peter Zijlstra wrote:
> On Wed, May 22, 2013 at 11:25:36AM +0200, Arnd Bergmann wrote:
> > Calling might_fault() for every __get_user/__put_user is rather expensive
> > because it turns what should be a single instruction (plus fixup) into an
> > external f
On Wed, May 22, 2013 at 11:25:36AM +0200, Arnd Bergmann wrote:
> Calling might_fault() for every __get_user/__put_user is rather expensive
> because it turns what should be a single instruction (plus fixup) into an
> external function call.
We could hide it all behind CONFIG_DEBUG_ATOMIC_SLEEP jus
On Wed, May 22, 2013 at 11:25:36AM +0200, Arnd Bergmann wrote:
> On Thursday 16 May 2013, Michael S. Tsirkin wrote:
> > This improves the might_fault annotations used
> > by uaccess routines:
> >
> > 1. The only reason uaccess routines might sleep
> >is if they fault. Make this explicit for
>
On Thursday 16 May 2013, Michael S. Tsirkin wrote:
> This improves the might_fault annotations used
> by uaccess routines:
>
> 1. The only reason uaccess routines might sleep
>is if they fault. Make this explicit for
>all architectures.
> 2. Accesses (e.g through socket ops) to kernel memo
This improves the might_fault annotations used
by uaccess routines:
1. The only reason uaccess routines might sleep
is if they fault. Make this explicit for
all architectures.
2. Accesses (e.g through socket ops) to kernel memory
with KERNEL_DS like net/sunrpc does will never sleep.
Re
