Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.31 as permitted sender) client-ip=23.128.96.31;
MIME-Version: 1.0
References: <20231002221909.2958708-1-irogers@google.com> <CAP-5=fX-VOeCkOJY5xeW67x0+A0tGAHM4VYBBz46L-g2eRCR+w@mail.gmail.com>
 <93afcf44-5f8b-49c1-abc5-5304cba5f991@intel.com> <CAP-5=fXzcR6QKKhFG5PS1pFYi5JsO4AOUoH_-Bv0O+11YzEkkw@mail.gmail.com>
 <CAM9d7cjQZvZm+Vyrx9PTUYMFN5RjE+i-Kq1kbffyVp2hGKF6sg@mail.gmail.com> <CAP-5=fUo-vuLofC4jgHC9z=BTe80OEiY_PoQWqQtyVdvHcf+KQ@mail.gmail.com>
In-Reply-To: <CAP-5=fUo-vuLofC4jgHC9z=BTe80OEiY_PoQWqQtyVdvHcf+KQ@mail.gmail.com>
From:   Namhyung Kim <namhyung@kernel.org>
Date:   Tue, 10 Oct 2023 22:56:01 -0700
Message-ID: <CAM9d7cjdb5WE-xdSdKD=p_EtsS7OSVEWL+GL3RVwczu-+1JvFQ@mail.gmail.com>
Subject: Re: [PATCH v1] perf intel-pt: pkt-decoder: Fix alignment issues
To:     Ian Rogers <irogers@google.com>
Cc:     Adrian Hunter <adrian.hunter@intel.com>,
        Alexander Shishkin <alexander.shishkin@linux.intel.com>,
        Ingo Molnar <mingo@redhat.com>,
        Arnaldo Carvalho de Melo <acme@kernel.org>,
        Peter Zijlstra <peterz@infradead.org>,
        Jiri Olsa <jolsa@kernel.org>, Miguel Ojeda <ojeda@kernel.org>,
        Liam Howlett <liam.howlett@oracle.com>,
        linux-kernel@vger.kernel.org, linux-perf-users@vger.kernel.org
Content-Type: text/plain; charset="UTF-8"
Content-Transfer-Encoding: 8BIT
Precedence: bulk

On Mon, Oct 9, 2023 at 8:31 AM Ian Rogers <irogers@google.com> wrote:
>
> On Sun, Oct 8, 2023 at 10:29 PM Namhyung Kim <namhyung@kernel.org> wrote:
> >
> > On Thu, Oct 5, 2023 at 2:24 PM Ian Rogers <irogers@google.com> wrote:
> > >
> > > On Thu, Oct 5, 2023 at 12:06 PM Adrian Hunter <adrian.hunter@intel.com> wrote:
> > > >
> > > > On 5/10/23 18:48, Ian Rogers wrote:
> > > > > On Mon, Oct 2, 2023 at 3:19 PM Ian Rogers <irogers@google.com> wrote:
> > > > >>
> > > > >> The byte aligned buffer is cast to large types and dereferenced
> > > > >> causing misaligned pointer warnings from undefined behavior sanitizer.
> > > > >> Fix the alignment issues with memcpy which may require the
> > > > >> introduction of temporaries.
> > > > >>
> > > > >> Signed-off-by: Ian Rogers <irogers@google.com>
> > > > >> ---
> > > > >
> > > > > This is a relatively small change that fixes building with
> > > > > -fsanitize=alignment -fsanitize-undefined-trap-on-error. Adrian, as
> > > > > this is Intel-PT could you take a look?
> > > >
> > > > Thanks! This has been down my list of things to do for ages,
> > > > but using get_unaligned_le16() etc seems nicer.  I sent a patch
> > > > set for that.
> > >
> > > Thanks Adrian! Your patch set looks good and I think after Arnaldo's
> > > comment is addressed we should go with it.
> >
> > I think it can be done as a later step as long as the interface is the
> > same.  Can I add your Ack's to the Adrian's patchset?
>
> I think addressing Arnaldo's comment:
> https://lore.kernel.org/lkml/ZR8QnasisGEsaaDR@kernel.org/
> will need some changes to the patch series, and so I was waiting to
> see the outcome of that.

It seems it's done without further changes.  Can I get your Ack's now?

Thanks,
Namhyung