[PATCH] ARM: futex: add SMP futex support when !CPU_USE_DOMAINS

[Nicolas Pitre]

On Wed, 20 Apr 2011, Will Deacon wrote:

> On Fri, 2011-04-08 at 13:58 +0100, Will Deacon wrote:
> > This patch uses the load/store exclusive instructions to add SMP futex
> > support for ARM.
> > 
> > Since the ARM architecture does not provide instructions for
> > unprivileged exclusive memory accesses, we can only provide SMP futexes
> > when CPU domain support is disabled.
> > 
> > Signed-off-by: Will Deacon <will.deacon at arm.com>
> > ---
> >  arch/arm/include/asm/futex.h |  137 +++++++++++++++++++++++++++--------------
> >  1 files changed, 90 insertions(+), 47 deletions(-)
> 
> Any comments on this patch? The LTP tests for {get,set}_robust_list seem
> happy enough but any review would be welcome.

I looked at http://article.gmane.org/gmane.linux.ports.arm.kernel/81847 
back then, and one issue I found with that version was the fact that the 
#ifdef condition were wrong (not depending on !CONFIG_CPU_USE_DOMAINS.

Your version looks better though, just by looking at the net amount of 
lines added.


Nicolas