netdev - Re: [PATCH v2 1/3] net/ncsi: fix restricted cast warning of sparse

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Date:   Tue, 13 Jul 2021 12:08:56 +0300
From:   Ivan Mikhaylov <i.mikhaylov@...ro.com>
To:     Joel Stanley <joel@....id.au>
CC:     "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Samuel Mendoza-Jonas <sam@...dozajonas.com>,
        "Benjamin Herrenschmidt" <benh@...nel.crashing.org>,
        Networking <netdev@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        OpenBMC Maillist <openbmc@...ts.ozlabs.org>
Subject: Re: [PATCH v2 1/3] net/ncsi: fix restricted cast warning of sparse

On Mon, 2021-07-12 at 09:09 +0000, Joel Stanley wrote:
> On Thu, 8 Jul 2021 at 12:27, Ivan Mikhaylov <i.mikhaylov@...ro.com> wrote:
> > 
> > Sparse reports:
> > net/ncsi/ncsi-rsp.c:406:24: warning: cast to restricted __be32
> > net/ncsi/ncsi-manage.c:732:33: warning: cast to restricted __be32
> > net/ncsi/ncsi-manage.c:756:25: warning: cast to restricted __be32
> > net/ncsi/ncsi-manage.c:779:25: warning: cast to restricted __be32
> 
> Strange, I don't get these warnings from sparse on my system.

https://patchwork.hopto.org/static/nipa/510079/12355969/build_32bit/stderr
All those errors from ntohl. David linked this one in first series of patches.

> 
> $ sparse --version
> 0.6.3 (Debian: 0.6.3-2)
> 
> > 
> > Signed-off-by: Ivan Mikhaylov <i.mikhaylov@...ro.com>
> > ---
> >  net/ncsi/ncsi-manage.c | 6 +++---
> >  net/ncsi/ncsi-rsp.c    | 2 +-
> >  2 files changed, 4 insertions(+), 4 deletions(-)
> > 
> > diff --git a/net/ncsi/ncsi-manage.c b/net/ncsi/ncsi-manage.c
> > index ca04b6df1341..42b54a3da2e6 100644
> > --- a/net/ncsi/ncsi-manage.c
> > +++ b/net/ncsi/ncsi-manage.c
> > @@ -700,7 +700,7 @@ static int ncsi_oem_gma_handler_bcm(struct ncsi_cmd_arg
> > *nca)
> >         nca->payload = NCSI_OEM_BCM_CMD_GMA_LEN;
> > 
> >         memset(data, 0, NCSI_OEM_BCM_CMD_GMA_LEN);
> > -       *(unsigned int *)data = ntohl(NCSI_OEM_MFR_BCM_ID);
> > +       *(unsigned int *)data = ntohl((__force __be32)NCSI_OEM_MFR_BCM_ID);
> 
> This looks wrong, the value you're passing isn't big endian. It would
> make more sense if the byte swap was ntohl, as it's coming from the
> cpu and going into the NCSI packet.

Is there any other ways to deal with those sparse errors?

Thanks.