Re: [PATCH rdma-next 1/2] RDMA/hns: Fix wrong alignment of port_pd variable

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On Tue, Mar 26, 2019 at 06:32:32PM +0200, Leon Romanovsky wrote:
> On Tue, Mar 26, 2019 at 05:41:15PM +0200, Gal Pressman wrote:
> > On 26-Mar-19 17:10, Leon Romanovsky wrote:
> > > On Tue, Mar 26, 2019 at 02:55:18PM +0200, Gal Pressman wrote:
> > >> On 19-Mar-19 11:10, Leon Romanovsky wrote:
> > >>> From: Leon Romanovsky <leonro@xxxxxxxxxxxx>
> > >>>
> > >>> port_pd is treated as le32 in declaration and read, fix assignment to be
> > >>> in le32 too. This change fixes the following compilation warnings.
> > >>>
> > >>> drivers/infiniband/hw/hns/hns_roce_ah.c:67:24: warning: incorrect type
> > >>> in assignment (different base types)
> > >>> drivers/infiniband/hw/hns/hns_roce_ah.c:67:24: expected restricted __le32 [usertype] port_pd
> > >>> drivers/infiniband/hw/hns/hns_roce_ah.c:67:24: got restricted __be32 [usertype]
> > >>>
> > >>> Fixes: 9a4435375cd1 ("IB/hns: Add driver files for hns RoCE driver")
> > >>> Signed-off-by: Leon Romanovsky <leonro@xxxxxxxxxxxx>
> > >>>  drivers/infiniband/hw/hns/hns_roce_ah.c | 2 +-
> > >>>  1 file changed, 1 insertion(+), 1 deletion(-)
> > >>>
> > >>> diff --git a/drivers/infiniband/hw/hns/hns_roce_ah.c b/drivers/infiniband/hw/hns/hns_roce_ah.c
> > >>> index b3c8c45ec1e3..64e0c69b69c5 100644
> > >>> +++ b/drivers/infiniband/hw/hns/hns_roce_ah.c
> > >>> @@ -70,7 +70,7 @@ struct ib_ah *hns_roce_create_ah(struct ib_pd *ibpd,
> > >>>  			     HNS_ROCE_VLAN_SL_BIT_MASK) <<
> > >>>  			     HNS_ROCE_VLAN_SL_SHIFT;
> > >>>
> > >>> -	ah->av.port_pd = cpu_to_be32(to_hr_pd(ibpd)->pdn |
> > >>> +	ah->av.port_pd = cpu_to_le32(to_hr_pd(ibpd)->pdn |
> > >>>  				     (rdma_ah_get_port_num(ah_attr) <<
> > >>>  				     HNS_ROCE_PORT_NUM_SHIFT));
> > >>>  	ah->av.gid_index = grh->sgid_index;
> > >>>
> > >>
> > >> The subject makes it sound like this is a cosmetic change (fix variable
> > >> alignment), I would consider rephrasing it.
> > >>
> > >> Reviewed-by: Gal Pressman <galpress@xxxxxxxxxx>
> > >
> > > Thanks Gal,
> > >
> > > I had an impression that "alignment" is common term to describe it.
> > > Any suggestions on how to rephrase it?
> > >
> >
> > You might be right, but personally this change was not what I expected after
> > reading the subject. It's a nit, feel free to ignore my comment :).
> >
> > Maybe "Fix wrong endianness conversion of port_pd" is better?

Yes

> I think so,
> 
> Jason, do you want me to resend it?

I want someone from hns to say that the changed swap is right.. I
assume this code works as is ??

Jason



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