* [patch] samples/bpf: silence shift wrapping warning
@ 2017-01-21 4:51 Dan Carpenter
2017-01-22 22:51 ` Alexei Starovoitov
0 siblings, 1 reply; 7+ messages in thread
From: Dan Carpenter @ 2017-01-21 4:51 UTC (permalink / raw)
To: Arnaldo Carvalho de Melo, Thomas Graf
Cc: Alexei Starovoitov, Joe Stringer, David S. Miller, linux-kernel,
kernel-janitors
max_key is a value in the 0-63 range, so on 32 bit systems the shift
could wrap.
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
diff --git a/samples/bpf/lwt_len_hist_user.c b/samples/bpf/lwt_len_hist_user.c
index ec8f3bb..bd06eef 100644
--- a/samples/bpf/lwt_len_hist_user.c
+++ b/samples/bpf/lwt_len_hist_user.c
@@ -68,7 +68,7 @@ int main(int argc, char **argv)
for (i = 1; i <= max_key + 1; i++) {
stars(starstr, data[i - 1], max_value, MAX_STARS);
printf("%8ld -> %-8ld : %-8ld |%-*s|\n",
- (1l << i) >> 1, (1l << i) - 1, data[i - 1],
+ (1ULL << i) >> 1, (1ULL << i) - 1, data[i - 1],
MAX_STARS, starstr);
}
^ permalink raw reply related [flat|nested] 7+ messages in thread
* Re: [patch] samples/bpf: silence shift wrapping warning
2017-01-21 4:51 [patch] samples/bpf: silence shift wrapping warning Dan Carpenter
@ 2017-01-22 22:51 ` Alexei Starovoitov
2017-01-23 13:27 ` Arnaldo Carvalho de Melo
2017-01-25 11:08 ` David Laight
0 siblings, 2 replies; 7+ messages in thread
From: Alexei Starovoitov @ 2017-01-22 22:51 UTC (permalink / raw)
To: Dan Carpenter
Cc: Arnaldo Carvalho de Melo, Thomas Graf, Alexei Starovoitov,
Joe Stringer, David S. Miller, linux-kernel, kernel-janitors,
netdev
On Sat, Jan 21, 2017 at 07:51:43AM +0300, Dan Carpenter wrote:
> max_key is a value in the 0-63 range, so on 32 bit systems the shift
> could wrap.
>
> Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Looks fine. I think 'net-next' is ok.
Acked-by: Alexei Starovoitov <ast@kernel.org>
> diff --git a/samples/bpf/lwt_len_hist_user.c b/samples/bpf/lwt_len_hist_user.c
> index ec8f3bb..bd06eef 100644
> --- a/samples/bpf/lwt_len_hist_user.c
> +++ b/samples/bpf/lwt_len_hist_user.c
> @@ -68,7 +68,7 @@ int main(int argc, char **argv)
> for (i = 1; i <= max_key + 1; i++) {
> stars(starstr, data[i - 1], max_value, MAX_STARS);
> printf("%8ld -> %-8ld : %-8ld |%-*s|\n",
> - (1l << i) >> 1, (1l << i) - 1, data[i - 1],
> + (1ULL << i) >> 1, (1ULL << i) - 1, data[i - 1],
> MAX_STARS, starstr);
> }
>
^ permalink raw reply [flat|nested] 7+ messages in thread
* Re: [patch] samples/bpf: silence shift wrapping warning
2017-01-22 22:51 ` Alexei Starovoitov
@ 2017-01-23 13:27 ` Arnaldo Carvalho de Melo
2017-01-25 11:08 ` David Laight
1 sibling, 0 replies; 7+ messages in thread
From: Arnaldo Carvalho de Melo @ 2017-01-23 13:27 UTC (permalink / raw)
To: Alexei Starovoitov
Cc: Dan Carpenter, Thomas Graf, Alexei Starovoitov, Joe Stringer,
David S. Miller, linux-kernel, kernel-janitors, netdev
Em Sun, Jan 22, 2017 at 02:51:25PM -0800, Alexei Starovoitov escreveu:
> On Sat, Jan 21, 2017 at 07:51:43AM +0300, Dan Carpenter wrote:
> > max_key is a value in the 0-63 range, so on 32 bit systems the shift
> > could wrap.
> >
> > Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
>
> Looks fine. I think 'net-next' is ok.
I could process these patches, if that would help,
- Arnaldo
> Acked-by: Alexei Starovoitov <ast@kernel.org>
> > diff --git a/samples/bpf/lwt_len_hist_user.c b/samples/bpf/lwt_len_hist_user.c
> > index ec8f3bb..bd06eef 100644
> > --- a/samples/bpf/lwt_len_hist_user.c
> > +++ b/samples/bpf/lwt_len_hist_user.c
> > @@ -68,7 +68,7 @@ int main(int argc, char **argv)
> > for (i = 1; i <= max_key + 1; i++) {
> > stars(starstr, data[i - 1], max_value, MAX_STARS);
> > printf("%8ld -> %-8ld : %-8ld |%-*s|\n",
> > - (1l << i) >> 1, (1l << i) - 1, data[i - 1],
> > + (1ULL << i) >> 1, (1ULL << i) - 1, data[i - 1],
> > MAX_STARS, starstr);
> > }
> >
^ permalink raw reply [flat|nested] 7+ messages in thread
* RE: [patch] samples/bpf: silence shift wrapping warning
2017-01-22 22:51 ` Alexei Starovoitov
2017-01-23 13:27 ` Arnaldo Carvalho de Melo
@ 2017-01-25 11:08 ` David Laight
1 sibling, 0 replies; 7+ messages in thread
From: David Laight @ 2017-01-25 11:08 UTC (permalink / raw)
To: 'Alexei Starovoitov', Dan Carpenter
Cc: Arnaldo Carvalho de Melo, Thomas Graf, Alexei Starovoitov,
Joe Stringer, David S. Miller, linux-kernel, kernel-janitors,
netdev
From: Alexei Starovoitov
> Sent: 22 January 2017 22:51
> On Sat, Jan 21, 2017 at 07:51:43AM +0300, Dan Carpenter wrote:
> > max_key is a value in the 0-63 range, so on 32 bit systems the shift
> > could wrap.
> >
> > Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
>
> Looks fine. I think 'net-next' is ok.
>
> Acked-by: Alexei Starovoitov <ast@kernel.org>
>
> > diff --git a/samples/bpf/lwt_len_hist_user.c b/samples/bpf/lwt_len_hist_user.c
> > index ec8f3bb..bd06eef 100644
> > --- a/samples/bpf/lwt_len_hist_user.c
> > +++ b/samples/bpf/lwt_len_hist_user.c
> > @@ -68,7 +68,7 @@ int main(int argc, char **argv)
> > for (i = 1; i <= max_key + 1; i++) {
> > stars(starstr, data[i - 1], max_value, MAX_STARS);
> > printf("%8ld -> %-8ld : %-8ld |%-*s|\n",
> > - (1l << i) >> 1, (1l << i) - 1, data[i - 1],
> > + (1ULL << i) >> 1, (1ULL << i) - 1, data[i - 1],
> > MAX_STARS, starstr);
> > }
The format effectors are wrong on 32bit systems.
David
^ permalink raw reply [flat|nested] 7+ messages in thread
* Re: [patch] samples/bpf: silence shift wrapping warning
2017-01-24 6:44 Alexei Starovoitov
2017-01-24 8:46 ` Dan Carpenter
@ 2017-01-24 16:02 ` Arnaldo Carvalho de Melo
1 sibling, 0 replies; 7+ messages in thread
From: Arnaldo Carvalho de Melo @ 2017-01-24 16:02 UTC (permalink / raw)
To: Alexei Starovoitov
Cc: Arnaldo Carvalho de Melo, Dan Carpenter, Thomas Graf,
Alexei Starovoitov, Joe Stringer, David S. Miller, linux-kernel,
kernel-janitors, netdev
Em Mon, Jan 23, 2017 at 10:44:34PM -0800, Alexei Starovoitov escreveu:
> On Mon, Jan 23, 2017 at 5:27 AM, Arnaldo Carvalho de Melo
> <arnaldo.melo@gmail.com> wrote:
> > Em Sun, Jan 22, 2017 at 02:51:25PM -0800, Alexei Starovoitov escreveu:
> >> On Sat, Jan 21, 2017 at 07:51:43AM +0300, Dan Carpenter wrote:
> >> > max_key is a value in the 0-63 range, so on 32 bit systems the shift
> >> > could wrap.
> >> >
> >> > Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
> >>
> >> Looks fine. I think 'net-next' is ok.
> >
> > I could process these patches, if that would help,
>
> Thanks for the offer.
> I don't think there will be conflicts with all the work happening in net-next,
> but it's best to avoid even possibility of it when we can.
Okay sir, I'll let you know when/if the tests I perform building
samples/bpf/ in my containers catch something,
- Arnaldo
> Dan,
> can you please resend the patch cc-ing Dave and netdev ?
> please mention [PATCH net-next] in the subject.
>
> > - Arnaldo
> >
> >> Acked-by: Alexei Starovoitov <ast@kernel.org>
> >
> >> > diff --git a/samples/bpf/lwt_len_hist_user.c b/samples/bpf/lwt_len_hist_user.c
> >> > index ec8f3bb..bd06eef 100644
> >> > --- a/samples/bpf/lwt_len_hist_user.c
> >> > +++ b/samples/bpf/lwt_len_hist_user.c
> >> > @@ -68,7 +68,7 @@ int main(int argc, char **argv)
> >> > for (i = 1; i <= max_key + 1; i++) {
> >> > stars(starstr, data[i - 1], max_value, MAX_STARS);
> >> > printf("%8ld -> %-8ld : %-8ld |%-*s|\n",
> >> > - (1l << i) >> 1, (1l << i) - 1, data[i - 1],
> >> > + (1ULL << i) >> 1, (1ULL << i) - 1, data[i - 1],
> >> > MAX_STARS, starstr);
> >> > }
> >> >
^ permalink raw reply [flat|nested] 7+ messages in thread
* Re: [patch] samples/bpf: silence shift wrapping warning
2017-01-24 6:44 Alexei Starovoitov
@ 2017-01-24 8:46 ` Dan Carpenter
2017-01-24 16:02 ` Arnaldo Carvalho de Melo
1 sibling, 0 replies; 7+ messages in thread
From: Dan Carpenter @ 2017-01-24 8:46 UTC (permalink / raw)
To: Alexei Starovoitov
Cc: Arnaldo Carvalho de Melo, Thomas Graf, Alexei Starovoitov,
Joe Stringer, David S. Miller, linux-kernel, kernel-janitors,
netdev
On Mon, Jan 23, 2017 at 10:44:34PM -0800, Alexei Starovoitov wrote:
> On Mon, Jan 23, 2017 at 5:27 AM, Arnaldo Carvalho de Melo
> <arnaldo.melo@gmail.com> wrote:
> > Em Sun, Jan 22, 2017 at 02:51:25PM -0800, Alexei Starovoitov escreveu:
> >> On Sat, Jan 21, 2017 at 07:51:43AM +0300, Dan Carpenter wrote:
> >> > max_key is a value in the 0-63 range, so on 32 bit systems the shift
> >> > could wrap.
> >> >
> >> > Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
> >>
> >> Looks fine. I think 'net-next' is ok.
> >
> > I could process these patches, if that would help,
>
> Thanks for the offer.
> I don't think there will be conflicts with all the work happening in net-next,
> but it's best to avoid even possibility of it when we can.
> Dan,
> can you please resend the patch cc-ing Dave and netdev ?
> please mention [PATCH net-next] in the subject.
>
Sure.
regards,
dan carpenter
^ permalink raw reply [flat|nested] 7+ messages in thread
* Re: [patch] samples/bpf: silence shift wrapping warning
@ 2017-01-24 6:44 Alexei Starovoitov
2017-01-24 8:46 ` Dan Carpenter
2017-01-24 16:02 ` Arnaldo Carvalho de Melo
0 siblings, 2 replies; 7+ messages in thread
From: Alexei Starovoitov @ 2017-01-24 6:44 UTC (permalink / raw)
To: Arnaldo Carvalho de Melo
Cc: Dan Carpenter, Thomas Graf, Alexei Starovoitov, Joe Stringer,
David S. Miller, linux-kernel, kernel-janitors, netdev
On Mon, Jan 23, 2017 at 5:27 AM, Arnaldo Carvalho de Melo
<arnaldo.melo@gmail.com> wrote:
> Em Sun, Jan 22, 2017 at 02:51:25PM -0800, Alexei Starovoitov escreveu:
>> On Sat, Jan 21, 2017 at 07:51:43AM +0300, Dan Carpenter wrote:
>> > max_key is a value in the 0-63 range, so on 32 bit systems the shift
>> > could wrap.
>> >
>> > Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
>>
>> Looks fine. I think 'net-next' is ok.
>
> I could process these patches, if that would help,
Thanks for the offer.
I don't think there will be conflicts with all the work happening in net-next,
but it's best to avoid even possibility of it when we can.
Dan,
can you please resend the patch cc-ing Dave and netdev ?
please mention [PATCH net-next] in the subject.
> - Arnaldo
>
>> Acked-by: Alexei Starovoitov <ast@kernel.org>
>
>> > diff --git a/samples/bpf/lwt_len_hist_user.c b/samples/bpf/lwt_len_hist_user.c
>> > index ec8f3bb..bd06eef 100644
>> > --- a/samples/bpf/lwt_len_hist_user.c
>> > +++ b/samples/bpf/lwt_len_hist_user.c
>> > @@ -68,7 +68,7 @@ int main(int argc, char **argv)
>> > for (i = 1; i <= max_key + 1; i++) {
>> > stars(starstr, data[i - 1], max_value, MAX_STARS);
>> > printf("%8ld -> %-8ld : %-8ld |%-*s|\n",
>> > - (1l << i) >> 1, (1l << i) - 1, data[i - 1],
>> > + (1ULL << i) >> 1, (1ULL << i) - 1, data[i - 1],
>> > MAX_STARS, starstr);
>> > }
>> >
^ permalink raw reply [flat|nested] 7+ messages in thread
end of thread, other threads:[~2017-01-25 11:09 UTC | newest]
Thread overview: 7+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2017-01-21 4:51 [patch] samples/bpf: silence shift wrapping warning Dan Carpenter
2017-01-22 22:51 ` Alexei Starovoitov
2017-01-23 13:27 ` Arnaldo Carvalho de Melo
2017-01-25 11:08 ` David Laight
2017-01-24 6:44 Alexei Starovoitov
2017-01-24 8:46 ` Dan Carpenter
2017-01-24 16:02 ` Arnaldo Carvalho de Melo
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).