2018-05-30 15:10:00

by Colin King

[permalink] [raw]
Subject: [PATCH][next] bpf: devmap: remove redundant assignment of dev = dev

From: Colin Ian King <[email protected]>

The assignment dev = dev is redundant and should be removed.

Detected by CoverityScan, CID#1469486 ("Evaluation order violation")

Signed-off-by: Colin Ian King <[email protected]>
---
kernel/bpf/devmap.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/bpf/devmap.c b/kernel/bpf/devmap.c
index ae16d0c373ef..1fe3fe60508a 100644
--- a/kernel/bpf/devmap.c
+++ b/kernel/bpf/devmap.c
@@ -352,7 +352,7 @@ int dev_map_enqueue(struct bpf_dtab_netdev *dst, struct xdp_buff *xdp,
static void *dev_map_lookup_elem(struct bpf_map *map, void *key)
{
struct bpf_dtab_netdev *obj = __dev_map_lookup_elem(map, *(u32 *)key);
- struct net_device *dev = dev = obj ? obj->dev : NULL;
+ struct net_device *dev = obj ? obj->dev : NULL;

return dev ? &dev->ifindex : NULL;
}
--
2.17.0



2018-05-30 17:19:24

by Song Liu

[permalink] [raw]
Subject: Re: [PATCH][next] bpf: devmap: remove redundant assignment of dev = dev

On Wed, May 30, 2018 at 8:09 AM, Colin King <[email protected]> wrote:
> From: Colin Ian King <[email protected]>
>
> The assignment dev = dev is redundant and should be removed.
>
> Detected by CoverityScan, CID#1469486 ("Evaluation order violation")
>
> Signed-off-by: Colin Ian King <[email protected]>

Acked-by: Song Liu <[email protected]>

> ---
> kernel/bpf/devmap.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/kernel/bpf/devmap.c b/kernel/bpf/devmap.c
> index ae16d0c373ef..1fe3fe60508a 100644
> --- a/kernel/bpf/devmap.c
> +++ b/kernel/bpf/devmap.c
> @@ -352,7 +352,7 @@ int dev_map_enqueue(struct bpf_dtab_netdev *dst, struct xdp_buff *xdp,
> static void *dev_map_lookup_elem(struct bpf_map *map, void *key)
> {
> struct bpf_dtab_netdev *obj = __dev_map_lookup_elem(map, *(u32 *)key);
> - struct net_device *dev = dev = obj ? obj->dev : NULL;
> + struct net_device *dev = obj ? obj->dev : NULL;
>
> return dev ? &dev->ifindex : NULL;
> }
> --
> 2.17.0
>

2018-05-30 21:08:50

by Alexei Starovoitov

[permalink] [raw]
Subject: Re: [PATCH][next] bpf: devmap: remove redundant assignment of dev = dev

On Wed, May 30, 2018 at 04:09:16PM +0100, Colin King wrote:
> From: Colin Ian King <[email protected]>
>
> The assignment dev = dev is redundant and should be removed.
>
> Detected by CoverityScan, CID#1469486 ("Evaluation order violation")
>
> Signed-off-by: Colin Ian King <[email protected]>

Applied, Thanks.

Please use [PATCH bpf-next] in the subject next time.
See Documentation/bpf/bpf_devel_QA.rst


2018-05-31 07:06:51

by Dan Carpenter

[permalink] [raw]
Subject: Re: [PATCH][next] bpf: devmap: remove redundant assignment of dev = dev

On Wed, May 30, 2018 at 05:07:15PM -0400, Alexei Starovoitov wrote:
> On Wed, May 30, 2018 at 04:09:16PM +0100, Colin King wrote:
> > From: Colin Ian King <[email protected]>
> >
> > The assignment dev = dev is redundant and should be removed.
> >
> > Detected by CoverityScan, CID#1469486 ("Evaluation order violation")
> >
> > Signed-off-by: Colin Ian King <[email protected]>
>
> Applied, Thanks.
>
> Please use [PATCH bpf-next] in the subject next time.
> See Documentation/bpf/bpf_devel_QA.rst

Guys, be reasonable...

git log --author=Carpenter | \
grep -A1 "Signed-off-by: Dan Carpenter <[email protected]>" | \
grep -v Carpenter | grep Signed | cut -d '<' -f 1 | sort -u | wc -l

I have sent patches to 206 maintainers. It doesn't scale for everyone
to have their own special document for sending patches.

I asked this last time, and I even skimmed your document, but how are
people supposed to go from linux-next to the correct bpf-next git tree?
It's a pain for me to do this for net, but net is way larger and busier
than any other tree. I know it's a bit rude for me to say that you guys
are not as important as net, but that's how I feel. I'm only going to
report bugs instead of writing patches if you guys are going to insist
on all sorts of new rules.

regards,
dan carpenter

2018-05-31 08:15:23

by Julia Lawall

[permalink] [raw]
Subject: Re: [PATCH][next] bpf: devmap: remove redundant assignment of dev = dev



On Thu, 31 May 2018, Dan Carpenter wrote:

> On Wed, May 30, 2018 at 05:07:15PM -0400, Alexei Starovoitov wrote:
> > On Wed, May 30, 2018 at 04:09:16PM +0100, Colin King wrote:
> > > From: Colin Ian King <[email protected]>
> > >
> > > The assignment dev = dev is redundant and should be removed.
> > >
> > > Detected by CoverityScan, CID#1469486 ("Evaluation order violation")
> > >
> > > Signed-off-by: Colin Ian King <[email protected]>
> >
> > Applied, Thanks.
> >
> > Please use [PATCH bpf-next] in the subject next time.
> > See Documentation/bpf/bpf_devel_QA.rst
>
> Guys, be reasonable...
>
> git log --author=Carpenter | \
> grep -A1 "Signed-off-by: Dan Carpenter <[email protected]>" | \
> grep -v Carpenter | grep Signed | cut -d '<' -f 1 | sort -u | wc -l
>
> I have sent patches to 206 maintainers. It doesn't scale for everyone
> to have their own special document for sending patches.

Thanks Dan, I support this point of view completely. Special information
has to be in one place and in a machine readable manner. Maybe
get_maintainers can produce this information in some way, if it is
essential.

julia

>
> I asked this last time, and I even skimmed your document, but how are
> people supposed to go from linux-next to the correct bpf-next git tree?
> It's a pain for me to do this for net, but net is way larger and busier
> than any other tree. I know it's a bit rude for me to say that you guys
> are not as important as net, but that's how I feel. I'm only going to
> report bugs instead of writing patches if you guys are going to insist
> on all sorts of new rules.
>
> regards,
> dan carpenter
> --
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