Re: [patch V4 03/14] futex: Move futex related mm_struct data into a struct

[Nam Cao]

Thomas Gleixner <tglx@xxxxxxxxxx> writes:
> --- a/include/linux/futex_types.h
> +++ b/include/linux/futex_types.h
> @@ -29,8 +29,41 @@ struct futex_sched_data {
>  	struct mutex				exit_mutex;
>  	unsigned int				state;
>  };
> -#else
> +
> +#ifdef CONFIG_FUTEX_PRIVATE_HASH
> +/**
> + * struct futex_mm_phash - Futex private hash related per MM data
> + * @lock:	Mutex to protect the private hash operations
> + * @hash:	RCU managed pointer to the private hash
> + * @hash_new:	Pointer to a newly allocated private hash
> + * @batches:	Batch state for RCU synchronization
> + * @rcu:	RCU head for call_rcu()
> + * @atomic:	Aggregate value for @hash_ref
> + * @ref:	Per CPU reference counter for a private hash
> + */
> +struct futex_mm_phash {
> +	struct mutex			lock;
> +	struct futex_private_hash	__rcu *hash;
> +	struct futex_private_hash	*hash_new;
> +	unsigned long			batches;
> +	struct rcu_head			rcu;
> +	atomic_long_t			atomic;
> +	unsigned int			__percpu *ref;
> +};

Riscv build breaks horribly. This fixes it:

diff --git a/include/linux/futex_types.h b/include/linux/futex_types.h
index 288666fb37b6..eb9f9cc0ffc6 100644
--- a/include/linux/futex_types.h
+++ b/include/linux/futex_types.h
@@ -5,6 +5,7 @@
 #ifdef CONFIG_FUTEX
 #include <linux/mutex_types.h>
 #include <linux/types.h>
+#include <asm/percpu.h>
 
 struct compat_robust_list_head;
 struct futex_pi_state;

Nam