On Thu, Jan 16, 2014 at 04:08:31PM -0800, Tim Chen wrote:
> +#ifndef arch_mcs_spin_lock_contended
> +/*
> + * Using smp_load_acquire() provides a memory barrier that ensures
> + * subsequent operations happen after the lock is acquired.
> + */
> +#define arch_mcs_spin_lock_contended(l)
> \
> + while (!(smp_load_acquire(l))) { \
> + arch_mutex_cpu_relax(); \
> + }
> +#endif
I think that wants to be:
#define arch_mcs_spin_lock_contended(l) \
do { \
while (!smp_load_acquire(l)) \
arch_mutex_cpu_relax(); \
} while (0)
So that we properly eat the ';' in: arch_mcs_spin_lock_contended(l);.
> +#ifndef arch_mcs_spin_unlock_contended
> +/*
> + * smp_store_release() provides a memory barrier to ensure all
> + * operations in the critical section has been completed before
> + * unlocking.
> + */
> +#define arch_mcs_spin_unlock_contended(l) \
> + smp_store_release((l), 1)
> #endif
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