netdev - Re: pull-request: bpf 2022-03-29

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Date:   Wed, 30 Mar 2022 13:01:08 +0200
From:   Jiri Olsa <olsajiri@...il.com>
To:     Alexei Starovoitov <alexei.starovoitov@...il.com>
Cc:     Jakub Kicinski <kuba@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Daniel Borkmann <daniel@...earbox.net>,
        Peter Zijlstra <peterz@...radead.org>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Andrii Nakryiko <andrii@...nel.org>,
        Network Development <netdev@...r.kernel.org>,
        bpf <bpf@...r.kernel.org>, Kernel Team <kernel-team@...com>
Subject: Re: pull-request: bpf 2022-03-29

On Wed, Mar 30, 2022 at 10:05:34AM +0200, Jiri Olsa wrote:
> On Tue, Mar 29, 2022 at 06:51:22PM -0700, Alexei Starovoitov wrote:
> > On Tue, Mar 29, 2022 at 6:41 PM Jakub Kicinski <kuba@...nel.org> wrote:
> > >
> > > On Tue, 29 Mar 2022 16:49:24 -0700 Alexei Starovoitov wrote:
> > > > Hi David, hi Jakub,
> > > >
> > > > The following pull-request contains BPF updates for your *net* tree.
> > > >
> > > > We've added 16 non-merge commits during the last 1 day(s) which contain
> > > > a total of 24 files changed, 354 insertions(+), 187 deletions(-).
> > > >
> > > > The main changes are:
> > > >
> > > > 1) x86 specific bits of fprobe/rethook, from Masami and Peter.
> > > >
> > > > 2) ice/xsk fixes, from Maciej and Magnus.
> > > >
> > > > 3) Various small fixes, from Andrii, Yonghong, Geliang and others.
> > >
> > > There are some new sparse warnings here that look semi-legit.
> > > As in harmless but not erroneous.
> > 
> > Both are new warnings and not due to these patches, right?
> > 
> > > kernel/trace/rethook.c:68:9: error: incompatible types in comparison expression (different address spaces):
> > > kernel/trace/rethook.c:68:9:    void ( [noderef] __rcu * )( ... )
> > > kernel/trace/rethook.c:68:9:    void ( * )( ... )
> > >
> > > 66 void rethook_free(struct rethook *rh)
> > > 67 {
> > > 68         rcu_assign_pointer(rh->handler, NULL);
> > > 69
> > > 70         call_rcu(&rh->rcu, rethook_free_rcu);
> > > 71 }
> > >
> > > Looks like this should be a WRITE_ONCE() ?
> > 
> > Masami, please take a look.
> > 
> > > And the __user annotations in bpf_trace.c are still not right,
> > > first arg of kprobe_multi_resolve_syms() should __user:
> > >
> > > kernel/trace/bpf_trace.c:2370:34: warning: incorrect type in argument 2 (different address spaces)
> > > kernel/trace/bpf_trace.c:2370:34:    expected void const [noderef] __user *from
> > > kernel/trace/bpf_trace.c:2370:34:    got void const *usyms
> > > kernel/trace/bpf_trace.c:2376:51: warning: incorrect type in argument 2 (different address spaces)
> > > kernel/trace/bpf_trace.c:2376:51:    expected char const [noderef] __user *src
> > > kernel/trace/bpf_trace.c:2376:51:    got char const *
> > > kernel/trace/bpf_trace.c:2443:49: warning: incorrect type in argument 1 (different address spaces)
> > > kernel/trace/bpf_trace.c:2443:49:    expected void const *usyms
> > > kernel/trace/bpf_trace.c:2443:49:    got void [noderef] __user *[assigned] usyms
> > 
> > This one is known. Still waiting for the fix from Jiri.
> 
> right, I replied that for some reason I can't see these warnings
> with 'make C=2' and latest sparse.. how do you run that?
> 
> if patch below fixes it for you, I can send formal patch quickly

ok, I was on top of bpf-next/master where it's still reverted,
I can hit that on bpf/master, I'll send the fix

jirka