* [PATCH] cxgb4: Remove redundant memset before memcpy
@ 2017-01-13 9:52 Shyam Saini
2017-01-13 15:57 ` Tobias Klauser
0 siblings, 1 reply; 6+ messages in thread
From: Shyam Saini @ 2017-01-13 9:52 UTC (permalink / raw)
To: hariprasad; +Cc: netdev, linux-kernel, Shyam Saini
The region set by the call to memset, immediately overwritten by the
subsequent call to memcpy and thus makes the memset redundant
Signed-off-by: Shyam Saini <mayhs11saini@gmail.com>
---
drivers/net/ethernet/chelsio/cxgb4/sched.c | 3 ---
1 file changed, 3 deletions(-)
diff --git a/drivers/net/ethernet/chelsio/cxgb4/sched.c b/drivers/net/ethernet/chelsio/cxgb4/sched.c
index cbd68a8..5725693 100644
--- a/drivers/net/ethernet/chelsio/cxgb4/sched.c
+++ b/drivers/net/ethernet/chelsio/cxgb4/sched.c
@@ -398,7 +398,6 @@ static struct sched_class *t4_sched_class_lookup(struct port_info *pi,
struct ch_sched_params tp;
memset(&info, 0, sizeof(info));
- memset(&tp, 0, sizeof(tp));
memcpy(&tp, p, sizeof(tp));
/* Don't try to match class parameter */
@@ -409,7 +408,6 @@ static struct sched_class *t4_sched_class_lookup(struct port_info *pi,
if (e->state == SCHED_STATE_UNUSED)
continue;
- memset(&info, 0, sizeof(info));
memcpy(&info, &e->info, sizeof(info));
/* Don't try to match class parameter */
info.u.params.class = SCHED_CLS_NONE;
@@ -458,7 +456,6 @@ static struct sched_class *t4_sched_class_alloc(struct port_info *pi,
if (!e)
goto out;
- memset(&np, 0, sizeof(np));
memcpy(&np, p, sizeof(np));
np.u.params.class = e->idx;
--
2.7.4
^ permalink raw reply related [flat|nested] 6+ messages in thread
* Re: [PATCH] cxgb4: Remove redundant memset before memcpy
2017-01-13 9:52 [PATCH] cxgb4: Remove redundant memset before memcpy Shyam Saini
@ 2017-01-13 15:57 ` Tobias Klauser
2017-01-14 0:55 ` Shyam Saini
0 siblings, 1 reply; 6+ messages in thread
From: Tobias Klauser @ 2017-01-13 15:57 UTC (permalink / raw)
To: Shyam Saini; +Cc: hariprasad, netdev, linux-kernel
On 2017-01-13 at 10:52:49 +0100, Shyam Saini <mayhs11saini@gmail.com> wrote:
> The region set by the call to memset, immediately overwritten by the
> subsequent call to memcpy and thus makes the memset redundant
>
> Signed-off-by: Shyam Saini <mayhs11saini@gmail.com>
> ---
> drivers/net/ethernet/chelsio/cxgb4/sched.c | 3 ---
> 1 file changed, 3 deletions(-)
>
> diff --git a/drivers/net/ethernet/chelsio/cxgb4/sched.c b/drivers/net/ethernet/chelsio/cxgb4/sched.c
> index cbd68a8..5725693 100644
> --- a/drivers/net/ethernet/chelsio/cxgb4/sched.c
> +++ b/drivers/net/ethernet/chelsio/cxgb4/sched.c
> @@ -398,7 +398,6 @@ static struct sched_class *t4_sched_class_lookup(struct port_info *pi,
> struct ch_sched_params tp;
>
> memset(&info, 0, sizeof(info));
This memset is also redundant because info is memcpy()'ed to before
being used in the loop (and it isn't used outside of the loop).
> - memset(&tp, 0, sizeof(tp));
>
> memcpy(&tp, p, sizeof(tp));
> /* Don't try to match class parameter */
> @@ -409,7 +408,6 @@ static struct sched_class *t4_sched_class_lookup(struct port_info *pi,
> if (e->state == SCHED_STATE_UNUSED)
> continue;
>
> - memset(&info, 0, sizeof(info));
> memcpy(&info, &e->info, sizeof(info));
> /* Don't try to match class parameter */
> info.u.params.class = SCHED_CLS_NONE;
> @@ -458,7 +456,6 @@ static struct sched_class *t4_sched_class_alloc(struct port_info *pi,
> if (!e)
> goto out;
>
> - memset(&np, 0, sizeof(np));
> memcpy(&np, p, sizeof(np));
> np.u.params.class = e->idx;
>
> --
> 2.7.4
>
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [PATCH] cxgb4: Remove redundant memset before memcpy
2017-01-13 15:57 ` Tobias Klauser
@ 2017-01-14 0:55 ` Shyam Saini
0 siblings, 0 replies; 6+ messages in thread
From: Shyam Saini @ 2017-01-14 0:55 UTC (permalink / raw)
To: Tobias Klauser; +Cc: hariprasad, linux-kernel
On Fri, Jan 13, 2017 at 04:57:14PM +0100, Tobias Klauser wrote:
> On 2017-01-13 at 10:52:49 +0100, Shyam Saini <mayhs11saini@gmail.com> wrote:
> > The region set by the call to memset, immediately overwritten by the
> > subsequent call to memcpy and thus makes the memset redundant
> >
> > Signed-off-by: Shyam Saini <mayhs11saini@gmail.com>
> > ---
> > drivers/net/ethernet/chelsio/cxgb4/sched.c | 3 ---
> > 1 file changed, 3 deletions(-)
> >
> > diff --git a/drivers/net/ethernet/chelsio/cxgb4/sched.c b/drivers/net/ethernet/chelsio/cxgb4/sched.c
> > index cbd68a8..5725693 100644
> > --- a/drivers/net/ethernet/chelsio/cxgb4/sched.c
> > +++ b/drivers/net/ethernet/chelsio/cxgb4/sched.c
> > @@ -398,7 +398,6 @@ static struct sched_class *t4_sched_class_lookup(struct port_info *pi,
> > struct ch_sched_params tp;
> >
> > memset(&info, 0, sizeof(info));
>
> This memset is also redundant because info is memcpy()'ed to before
> being used in the loop (and it isn't used outside of the loop).
Thanks a lot for pointing out that.
I'll remove that too and resend it.
Regards,
Shyam
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [PATCH] cxgb4: Remove redundant memset before memcpy
2017-01-14 1:17 Shyam Saini
2017-01-14 12:27 ` Tobias Klauser
@ 2017-01-14 17:00 ` David Miller
1 sibling, 0 replies; 6+ messages in thread
From: David Miller @ 2017-01-14 17:00 UTC (permalink / raw)
To: mayhs11saini; +Cc: hariprasad, tklauser, netdev, linux-kernel
From: Shyam Saini <mayhs11saini@gmail.com>
Date: Sat, 14 Jan 2017 06:47:40 +0530
> The region set by the call to memset, immediately overwritten by
> the subsequent call to memcpy and thus makes the memset redundant.
>
> Also remove the memset((&info, 0, sizeof(info)) on line 398 because
> info is memcpy()'ed to before being used in the loop and it isn't
> used outside of the loop.
>
> Signed-off-by: Shyam Saini <mayhs11saini@gmail.com>
Applied to net-next, thanks.
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [PATCH] cxgb4: Remove redundant memset before memcpy
2017-01-14 1:17 Shyam Saini
@ 2017-01-14 12:27 ` Tobias Klauser
2017-01-14 17:00 ` David Miller
1 sibling, 0 replies; 6+ messages in thread
From: Tobias Klauser @ 2017-01-14 12:27 UTC (permalink / raw)
To: Shyam Saini; +Cc: hariprasad, netdev, linux-kernel
On 2017-01-14 at 02:17:40 +0100, Shyam Saini <mayhs11saini@gmail.com> wrote:
> The region set by the call to memset, immediately overwritten by
> the subsequent call to memcpy and thus makes the memset redundant.
>
> Also remove the memset((&info, 0, sizeof(info)) on line 398 because
> info is memcpy()'ed to before being used in the loop and it isn't
> used outside of the loop.
>
> Signed-off-by: Shyam Saini <mayhs11saini@gmail.com>
Reviewed-by: Tobias Klauser <tklauser@distanz.ch>
^ permalink raw reply [flat|nested] 6+ messages in thread
* [PATCH] cxgb4: Remove redundant memset before memcpy
@ 2017-01-14 1:17 Shyam Saini
2017-01-14 12:27 ` Tobias Klauser
2017-01-14 17:00 ` David Miller
0 siblings, 2 replies; 6+ messages in thread
From: Shyam Saini @ 2017-01-14 1:17 UTC (permalink / raw)
To: hariprasad; +Cc: tklauser, netdev, linux-kernel, Shyam Saini
The region set by the call to memset, immediately overwritten by
the subsequent call to memcpy and thus makes the memset redundant.
Also remove the memset((&info, 0, sizeof(info)) on line 398 because
info is memcpy()'ed to before being used in the loop and it isn't
used outside of the loop.
Signed-off-by: Shyam Saini <mayhs11saini@gmail.com>
---
drivers/net/ethernet/chelsio/cxgb4/sched.c | 5 -----
1 file changed, 5 deletions(-)
diff --git a/drivers/net/ethernet/chelsio/cxgb4/sched.c b/drivers/net/ethernet/chelsio/cxgb4/sched.c
index cbd68a8..c902635 100644
--- a/drivers/net/ethernet/chelsio/cxgb4/sched.c
+++ b/drivers/net/ethernet/chelsio/cxgb4/sched.c
@@ -397,9 +397,6 @@ static struct sched_class *t4_sched_class_lookup(struct port_info *pi,
struct ch_sched_params info;
struct ch_sched_params tp;
- memset(&info, 0, sizeof(info));
- memset(&tp, 0, sizeof(tp));
-
memcpy(&tp, p, sizeof(tp));
/* Don't try to match class parameter */
tp.u.params.class = SCHED_CLS_NONE;
@@ -409,7 +406,6 @@ static struct sched_class *t4_sched_class_lookup(struct port_info *pi,
if (e->state == SCHED_STATE_UNUSED)
continue;
- memset(&info, 0, sizeof(info));
memcpy(&info, &e->info, sizeof(info));
/* Don't try to match class parameter */
info.u.params.class = SCHED_CLS_NONE;
@@ -458,7 +454,6 @@ static struct sched_class *t4_sched_class_alloc(struct port_info *pi,
if (!e)
goto out;
- memset(&np, 0, sizeof(np));
memcpy(&np, p, sizeof(np));
np.u.params.class = e->idx;
--
2.7.4
^ permalink raw reply related [flat|nested] 6+ messages in thread
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2017-01-13 9:52 [PATCH] cxgb4: Remove redundant memset before memcpy Shyam Saini
2017-01-13 15:57 ` Tobias Klauser
2017-01-14 0:55 ` Shyam Saini
2017-01-14 1:17 Shyam Saini
2017-01-14 12:27 ` Tobias Klauser
2017-01-14 17:00 ` David Miller
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