On Thu, Jan 16, 2014 at 04:08:36PM -0800, Tim Chen wrote: > This patch adds Kconfig entries to allow architectures to hook into the > MCS lock/unlock functions in the contended case. > > From: Will Deacon <[email protected]> > Signed-off-by: Will Deacon <[email protected]>
Reviewed-by: Paul E. McKenney <[email protected]> > --- > arch/Kconfig | 3 +++ > include/linux/mcs_spinlock.h | 8 ++++++++ > 2 files changed, 11 insertions(+) > > diff --git a/arch/Kconfig b/arch/Kconfig > index 80bbb8c..8a2a056 100644 > --- a/arch/Kconfig > +++ b/arch/Kconfig > @@ -303,6 +303,9 @@ config HAVE_CMPXCHG_LOCAL > config HAVE_CMPXCHG_DOUBLE > bool > > +config HAVE_ARCH_MCS_LOCK > + bool > + > config ARCH_WANT_IPC_PARSE_VERSION > bool > > diff --git a/include/linux/mcs_spinlock.h b/include/linux/mcs_spinlock.h > index d54bb23..d2c02ad 100644 > --- a/include/linux/mcs_spinlock.h > +++ b/include/linux/mcs_spinlock.h > @@ -12,6 +12,14 @@ > #ifndef __LINUX_MCS_SPINLOCK_H > #define __LINUX_MCS_SPINLOCK_H > > +/* > + * An architecture may provide its own lock/unlock functions for the > + * contended case. > + */ > +#ifdef CONFIG_HAVE_ARCH_MCS_LOCK > +#include <asm/mcs_spinlock.h> > +#endif > + > struct mcs_spinlock { > struct mcs_spinlock *next; > int locked; /* 1 if lock acquired */ > -- > 1.7.11.7 > > -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
