RDMA/rxe: Remove RXE_POOL_ATOMIC

rxe_alloc() used the RXE_POOL_ATOMIC flag in rxe_type_info to select
GFP_ATOMIC in calls to kzalloc(). This was intended to handle cases where
an object could be created in interrupt context. This no longer occurs
since allocating those objects has moved into the core so this flag is not
necessary. An incorrect use of this flag was still present for rxe_mc_elem
objects and is removed.

Link: https://lore.kernel.org/r/20210125211641.2694-4-rpearson@hpe.comSigned-off-by: Bob Pearson <rpearson@hpe.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>

drivers/infiniband/sw/rxe/rxe_pool.c

@@ -84,7 +84,6 @@ struct rxe_type_info rxe_type_info[RXE_NUM_TYPES] = {
 		.name		= "rxe-mc_elem",
 		.size		= sizeof(struct rxe_mc_elem),
 		.elem_offset	= offsetof(struct rxe_mc_elem, pelem),
-		.flags		= RXE_POOL_ATOMIC,
 	},
 };
 
@@ -380,8 +379,6 @@ void *rxe_alloc(struct rxe_pool *pool)
 	struct rxe_pool_entry *elem;
 	u8 *obj;
 
-	might_sleep_if(!(pool->flags & RXE_POOL_ATOMIC));
-
 	read_lock_irqsave(&pool->pool_lock, flags);
 	if (pool->state != RXE_POOL_STATE_VALID) {
 		read_unlock_irqrestore(&pool->pool_lock, flags);
@@ -397,8 +394,7 @@ void *rxe_alloc(struct rxe_pool *pool)
 	if (atomic_inc_return(&pool->num_elem) > pool->max_elem)
 		goto out_cnt;
 
-	obj = kzalloc(info->size, (pool->flags & RXE_POOL_ATOMIC) ?
-		      GFP_ATOMIC : GFP_KERNEL);
+	obj = kzalloc(info->size, GFP_KERNEL);
 	if (!obj)
 		goto out_cnt;
 

drivers/infiniband/sw/rxe/rxe_pool.h

@@ -11,7 +11,6 @@
 #define RXE_POOL_CACHE_FLAGS	(0)
 
 enum rxe_pool_flags {
-	RXE_POOL_ATOMIC		= BIT(0),
 	RXE_POOL_INDEX		= BIT(1),
 	RXE_POOL_KEY		= BIT(2),
 	RXE_POOL_NO_ALLOC	= BIT(4),