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 <will.deacon@xxxxxxx>
> Signed-off-by: Will Deacon <will.deacon@xxxxxxx>
Reviewed-by: Paul E. McKenney <paulmck@xxxxxxxxxxxxxxxxxx>
> ---
> 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
>
>
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