[dpdk-stable] patch 'ring: remove useless variables' has been queued to stable release 18.02.2

[luca.boccassi at gmail.com]

Hi,

FYI, your patch has been queued to stable release 18.02.2

Note it hasn't been pushed to http://dpdk.org/browse/dpdk-stable yet.
It will be pushed if I get no objections before 05/25/18. So please
shout if anyone has objections.

Thanks.

Luca Boccassi

---
>From d19a188b625cab7391a037795ac204b4db9d97ff Mon Sep 17 00:00:00 2001
From: Andy Green <andy at warmcat.com>
Date: Thu, 17 May 2018 21:49:17 +0800
Subject: [PATCH] ring: remove useless variables

[ upstream commit 712a3db0b5b2c7e6380bdeb84b803bb0e0f97c15 ]

There were warnings with GCC 8.1:

In function '__rte_ring_move_prod_head':
rte_ring_generic.h:76:3:
warning: ISO C90 forbids mixed declarations and code
[-Wdeclaration-after-statement]
   const uint32_t cons_tail = r->cons.tail;
   ^~~~~

In function '__rte_ring_move_cons_head':
rte_ring_generic.h:147:3:
warning: ISO C90 forbids mixed declarations and code
[-Wdeclaration-after-statement]
   const uint32_t prod_tail = r->prod.tail;

Fixes: 0dfc98c507b1 ("ring: separate out head index manipulation")

Signed-off-by: Andy Green <andy at warmcat.com>
Acked-by: Olivier Matz <olivier.matz at 6wind.com>
---
 lib/librte_ring/rte_ring_generic.h | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/lib/librte_ring/rte_ring_generic.h b/lib/librte_ring/rte_ring_generic.h
index 5b110425f..c2d482bc9 100644
--- a/lib/librte_ring/rte_ring_generic.h
+++ b/lib/librte_ring/rte_ring_generic.h
@@ -73,14 +73,13 @@ __rte_ring_move_prod_head(struct rte_ring *r, int is_sp,
 		 */
 		rte_smp_rmb();
 
-		const uint32_t cons_tail = r->cons.tail;
 		/*
 		 *  The subtraction is done between two unsigned 32bits value
 		 * (the result is always modulo 32 bits even if we have
 		 * *old_head > cons_tail). So 'free_entries' is always between 0
 		 * and capacity (which is < size).
 		 */
-		*free_entries = (capacity + cons_tail - *old_head);
+		*free_entries = (capacity + r->cons.tail - *old_head);
 
 		/* check that we have enough room in ring */
 		if (unlikely(n > *free_entries))
@@ -144,13 +143,12 @@ __rte_ring_move_cons_head(struct rte_ring *r, int is_sc,
 		 */
 		rte_smp_rmb();
 
-		const uint32_t prod_tail = r->prod.tail;
 		/* The subtraction is done between two unsigned 32bits value
 		 * (the result is always modulo 32 bits even if we have
 		 * cons_head > prod_tail). So 'entries' is always between 0
 		 * and size(ring)-1.
 		 */
-		*entries = (prod_tail - *old_head);
+		*entries = (r->prod.tail - *old_head);
 
 		/* Set the actual entries for dequeue */
 		if (n > *entries)
-- 
2.14.2