2023-01-18 16:25:53

by Andrzej Hajda

Subject: [PATCH v5 6/7] qed: use __xchg if possible

Recently introduced helper simplifies the code.

Signed-off-by: Andrzej Hajda <[email protected]>
---
include/linux/qed/qed_chain.h | 19 +++++++------------
1 file changed, 7 insertions(+), 12 deletions(-)

diff --git a/include/linux/qed/qed_chain.h b/include/linux/qed/qed_chain.h
index a84063492c71ae..6355d558cf01b2 100644
--- a/include/linux/qed/qed_chain.h
+++ b/include/linux/qed/qed_chain.h
@@ -11,6 +11,7 @@
#include <asm/byteorder.h>
#include <linux/kernel.h>
#include <linux/list.h>
+#include <linux/non-atomic/xchg.h>
#include <linux/sizes.h>
#include <linux/slab.h>
#include <linux/qed/common_hsi.h>
@@ -368,7 +369,7 @@ static inline void qed_chain_return_produced(struct qed_chain *p_chain)
*/
static inline void *qed_chain_produce(struct qed_chain *p_chain)
{
- void *p_ret = NULL, *p_prod_idx, *p_prod_page_idx;
+ void *p_prod_idx, *p_prod_page_idx;

if (is_chain_u16(p_chain)) {
if ((p_chain->u.chain16.prod_idx &
@@ -390,11 +391,8 @@ static inline void *qed_chain_produce(struct qed_chain *p_chain)
p_chain->u.chain32.prod_idx++;
}

- p_ret = p_chain->p_prod_elem;
- p_chain->p_prod_elem = (void *)(((u8 *)p_chain->p_prod_elem) +
- p_chain->elem_size);
-
- return p_ret;
+ return __xchg(&p_chain->p_prod_elem,
+ (u8 *)p_chain->p_prod_elem + p_chain->elem_size);
}

/**
@@ -439,7 +437,7 @@ static inline void qed_chain_recycle_consumed(struct qed_chain *p_chain)
*/
static inline void *qed_chain_consume(struct qed_chain *p_chain)
{
- void *p_ret = NULL, *p_cons_idx, *p_cons_page_idx;
+ void *p_cons_idx, *p_cons_page_idx;

if (is_chain_u16(p_chain)) {
if ((p_chain->u.chain16.cons_idx &
@@ -461,11 +459,8 @@ static inline void *qed_chain_consume(struct qed_chain *p_chain)
p_chain->u.chain32.cons_idx++;
}

- p_ret = p_chain->p_cons_elem;
- p_chain->p_cons_elem = (void *)(((u8 *)p_chain->p_cons_elem) +
- p_chain->elem_size);
-
- return p_ret;
+ return __xchg(&p_chain->p_cons_elem,
+ (u8 *)p_chain->p_cons_elem + p_chain->elem_size);
}

/**
--
2.34.1

2023-02-27 09:57:02

by Andi Shyti

Subject: Re: [Intel-gfx] [PATCH v5 6/7] qed: use __xchg if possible

Hi Andrzej,

On Wed, Jan 18, 2023 at 04:44:49PM +0100, Andrzej Hajda wrote:
> Recently introduced helper simplifies the code.
>
> Signed-off-by: Andrzej Hajda <[email protected]>

Reviewed-by: Andi Shyti <[email protected]>

Thanks,
Andi

2023-03-12 14:41:21

by tip-bot2 for Jacob Pan

Subject: [tip: locking/core] qed: use __xchg if possible

The following commit has been merged into the locking/core branch of tip:

Commit-ID: 9b579a841f9032a231e9b14a23dc6699cbe6d311
Gitweb: https://git.kernel.org/tip/9b579a841f9032a231e9b14a23dc6699cbe6d311
Author: Andrzej Hajda <[email protected]>
AuthorDate: Wed, 18 Jan 2023 16:44:49 +01:00
Committer: Peter Zijlstra <[email protected]>
CommitterDate: Sat, 11 Mar 2023 14:03:59 +01:00

qed: use __xchg if possible

Recently introduced helper simplifies the code.

Signed-off-by: Andrzej Hajda <[email protected]>
Signed-off-by: Peter Zijlstra (Intel) <[email protected]>
Reviewed-by: Andi Shyti <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
---
include/linux/qed/qed_chain.h | 19 +++++++------------
1 file changed, 7 insertions(+), 12 deletions(-)

diff --git a/include/linux/qed/qed_chain.h b/include/linux/qed/qed_chain.h
index a840634..6355d55 100644
--- a/include/linux/qed/qed_chain.h
+++ b/include/linux/qed/qed_chain.h
@@ -11,6 +11,7 @@
#include <asm/byteorder.h>
#include <linux/kernel.h>
#include <linux/list.h>
+#include <linux/non-atomic/xchg.h>
#include <linux/sizes.h>
#include <linux/slab.h>
#include <linux/qed/common_hsi.h>
@@ -368,7 +369,7 @@ static inline void qed_chain_return_produced(struct qed_chain *p_chain)
*/
static inline void *qed_chain_produce(struct qed_chain *p_chain)
{
- void *p_ret = NULL, *p_prod_idx, *p_prod_page_idx;
+ void *p_prod_idx, *p_prod_page_idx;

if (is_chain_u16(p_chain)) {
if ((p_chain->u.chain16.prod_idx &
@@ -390,11 +391,8 @@ static inline void *qed_chain_produce(struct qed_chain *p_chain)
p_chain->u.chain32.prod_idx++;
}

- p_ret = p_chain->p_prod_elem;
- p_chain->p_prod_elem = (void *)(((u8 *)p_chain->p_prod_elem) +
- p_chain->elem_size);
-
- return p_ret;
+ return __xchg(&p_chain->p_prod_elem,
+ (u8 *)p_chain->p_prod_elem + p_chain->elem_size);
}

/**
@@ -439,7 +437,7 @@ static inline void qed_chain_recycle_consumed(struct qed_chain *p_chain)
*/
static inline void *qed_chain_consume(struct qed_chain *p_chain)
{
- void *p_ret = NULL, *p_cons_idx, *p_cons_page_idx;
+ void *p_cons_idx, *p_cons_page_idx;

if (is_chain_u16(p_chain)) {
if ((p_chain->u.chain16.cons_idx &
@@ -461,11 +459,8 @@ static inline void *qed_chain_consume(struct qed_chain *p_chain)
p_chain->u.chain32.cons_idx++;
}

- p_ret = p_chain->p_cons_elem;
- p_chain->p_cons_elem = (void *)(((u8 *)p_chain->p_cons_elem) +
- p_chain->elem_size);
-
- return p_ret;
+ return __xchg(&p_chain->p_cons_elem,
+ (u8 *)p_chain->p_cons_elem + p_chain->elem_size);
}

/**