Re: [PATCH 14/16] tmem: cleanup: drop useless functions from head file

[Andrew Cooper <andrew.cooper3@citrix.com>]

On 20/11/13 08:46, Bob Liu wrote:
> They are several one line functions in tmem_xen.h which are useless, this patch
> embeded them into tmem.c directly.
>
> Signed-off-by: Bob Liu <bob.liu@oracle.com>
> ---
>  xen/common/tmem.c          |   22 +++++++++++-----------
>  xen/include/xen/tmem_xen.h |   27 ---------------------------
>  2 files changed, 11 insertions(+), 38 deletions(-)
>
> diff --git a/xen/common/tmem.c b/xen/common/tmem.c
> index bf0fa1b..2e807d4 100644
> --- a/xen/common/tmem.c
> +++ b/xen/common/tmem.c
> @@ -1212,7 +1212,7 @@ obj_unlock:
>  
>  static int tmem_evict(void)
>  {
> -    struct client *client = tmem_client_from_current();
> +    struct client *client = (struct client *)current->domain->tmem;

domain->tmem is a void pointer.  Therefore this explicit cast to (struct
client *) is redundant.

I would however, suggest updating struct domain to have a struct client
pointer rather than a void pointer.

~Andrew

>      struct tmem_page_descriptor *pgp = NULL, *pgp2, *pgp_del;
>      struct tmem_object_root *obj;
>      struct tmem_pool *pool;
> @@ -1625,7 +1625,7 @@ static int do_tmem_get(struct tmem_pool *pool, struct oid *oidp, uint32_t index,
>              list_del(&pgp->us.client_eph_pages);
>              list_add_tail(&pgp->us.client_eph_pages,&client->ephemeral_page_list);
>              spin_unlock(&eph_lists_spinlock);
> -            obj->last_client = tmem_get_cli_id_from_current();
> +            obj->last_client = current->domain->domain_id;
>          }
>      }
>      if ( obj != NULL )
> @@ -1694,7 +1694,7 @@ out:
>  
>  static int do_tmem_destroy_pool(uint32_t pool_id)
>  {
> -    struct client *client = tmem_client_from_current();
> +    struct client *client = (struct client *)current->domain->tmem;
>      struct tmem_pool *pool;
>  
>      if ( client->pools == NULL )
> @@ -1725,7 +1725,7 @@ static int do_tmem_new_pool(domid_t this_cli_id,
>      int i;
>  
>      if ( this_cli_id == TMEM_CLI_ID_NULL )
> -        cli_id = tmem_get_cli_id_from_current();
> +        cli_id = current->domain->domain_id;
>      else
>          cli_id = this_cli_id;
>      tmem_client_info("tmem: allocating %s-%s tmem pool for %s=%d...",
> @@ -1766,7 +1766,7 @@ static int do_tmem_new_pool(domid_t this_cli_id,
>      }
>      else
>      {
> -        client = tmem_client_from_current();
> +        client = (struct client *)current->domain->tmem;
>          ASSERT(client != NULL);
>          for ( d_poolid = 0; d_poolid < MAX_POOLS_PER_DOMAIN; d_poolid++ )
>              if ( client->pools[d_poolid] == NULL )
> @@ -2206,7 +2206,7 @@ static int do_tmem_control(struct tmem_op *op)
>      uint32_t subop = op->u.ctrl.subop;
>      struct oid *oidp = (struct oid *)(&op->u.ctrl.oid[0]);
>  
> -    if (!tmem_current_is_privileged())
> +    if ( xsm_tmem_control(XSM_PRIV) )
>          return -EPERM;
>  
>      switch(subop)
> @@ -2278,7 +2278,7 @@ static int do_tmem_control(struct tmem_op *op)
>  long do_tmem_op(tmem_cli_op_t uops)
>  {
>      struct tmem_op op;
> -    struct client *client = tmem_client_from_current();
> +    struct client *client = (struct client *)current->domain->tmem;
>      struct tmem_pool *pool = NULL;
>      struct oid *oidp;
>      int rc = 0;
> @@ -2290,10 +2290,10 @@ long do_tmem_op(tmem_cli_op_t uops)
>      if ( !tmem_initialized )
>          return -ENODEV;
>  
> -    if ( !tmem_current_permitted() )
> +    if ( xsm_tmem_op(XSM_HOOK) )
>          return -EPERM;
>  
> -    if ( client != NULL && tmem_client_is_dying(client) )
> +    if ( client != NULL && client->domain->is_dying )
>          return -ENODEV;
>  
>      if ( unlikely(tmem_get_tmemop_from_client(&op, uops) != 0) )
> @@ -2328,7 +2328,7 @@ long do_tmem_op(tmem_cli_op_t uops)
>      {
>          write_lock(&tmem_rwlock);
>          write_lock_set = 1;
> -        if ( (client = client_create(tmem_get_cli_id_from_current())) == NULL )
> +        if ( (client = client_create(current->domain->domain_id)) == NULL )
>          {
>              tmem_client_err("tmem: can't create tmem structure for %s\n",
>                             tmem_client_str);
> @@ -2417,7 +2417,7 @@ void tmem_destroy(void *v)
>      if ( client == NULL )
>          return;
>  
> -    if ( !tmem_client_is_dying(client) )
> +    if ( !client->domain->is_dying )
>      {
>          printk("tmem: tmem_destroy can only destroy dying client\n");
>          return;
> diff --git a/xen/include/xen/tmem_xen.h b/xen/include/xen/tmem_xen.h
> index c4b9f5a..bf3be62 100644
> --- a/xen/include/xen/tmem_xen.h
> +++ b/xen/include/xen/tmem_xen.h
> @@ -183,33 +183,6 @@ static inline struct client *tmem_client_from_cli_id(domid_t cli_id)
>      return c;
>  }
>  
> -static inline struct client *tmem_client_from_current(void)
> -{
> -    return (struct client *)(current->domain->tmem);
> -}
> -
> -#define tmem_client_is_dying(_client) (!!_client->domain->is_dying)
> -
> -static inline domid_t tmem_get_cli_id_from_current(void)
> -{
> -    return current->domain->domain_id;
> -}
> -
> -static inline struct domain *tmem_get_cli_ptr_from_current(void)
> -{
> -    return current->domain;
> -}
> -
> -static inline bool_t tmem_current_permitted(void)
> -{
> -    return !xsm_tmem_op(XSM_HOOK);
> -}
> -
> -static inline bool_t tmem_current_is_privileged(void)
> -{
> -    return !xsm_tmem_control(XSM_PRIV);
> -}
> -
>  static inline uint8_t tmem_get_first_byte(struct page_info *pfp)
>  {
>      void *p = __map_domain_page(pfp);