linux-kernel - Re: [PATCH 1/2] infiniband: qplib

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Date:   Tue, 6 Mar 2018 16:45:39 -0700
From:   Jason Gunthorpe <jgg@...pe.ca>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     Selvin Xavier <selvin.xavier@...adcom.com>,
        Devesh Sharma <devesh.sharma@...adcom.com>,
        Somnath Kotur <somnath.kotur@...adcom.com>,
        Sriharsha Basavapatna <sriharsha.basavapatna@...adcom.com>,
        Doug Ledford <dledford@...hat.com>,
        Bart Van Assche <bart.vanassche@....com>,
        Eddie Wai <eddie.wai@...adcom.com>,
        linux-rdma <linux-rdma@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/2] infiniband: qplib_fp: fix pointer cast

On Wed, Mar 07, 2018 at 12:25:14AM +0100, Arnd Bergmann wrote:
> On Wed, Feb 28, 2018 at 10:15 PM, Jason Gunthorpe <jgg@...pe.ca> wrote:
> > On Tue, Feb 20, 2018 at 09:56:26PM +0100, Arnd Bergmann wrote:
> >> Building for a 32-bit target results in a couple of warnings from casting between
> >> a 32-bit pointer and a 64-bit integer:
> >>
> >> drivers/infiniband/hw/bnxt_re/qplib_fp.c: In function 'bnxt_qplib_service_nq':
> >> drivers/infiniband/hw/bnxt_re/qplib_fp.c:333:23: error: cast to pointer from integer of different size [-Werror=int-to-pointer-cast]
> >>     bnxt_qplib_arm_srq((struct bnxt_qplib_srq *)q_handle,
> >>                        ^
> >> drivers/infiniband/hw/bnxt_re/qplib_fp.c:336:12: error: cast to pointer from integer of different size [-Werror=int-to-pointer-cast]
> >>             (struct bnxt_qplib_srq *)q_handle,
> >>             ^
> >> In file included from include/linux/byteorder/little_endian.h:5,
> >>                  from arch/arm/include/uapi/asm/byteorder.h:22,
> >>                  from include/asm-generic/bitops/le.h:6,
> >>                  from arch/arm/include/asm/bitops.h:342,
> >>                  from include/linux/bitops.h:38,
> >>                  from include/linux/kernel.h:11,
> >>                  from include/linux/interrupt.h:6,
> >>                  from drivers/infiniband/hw/bnxt_re/qplib_fp.c:39:
> >> drivers/infiniband/hw/bnxt_re/qplib_fp.c: In function 'bnxt_qplib_create_srq':
> >> include/uapi/linux/byteorder/little_endian.h:31:43: error: cast from pointer to integer of different size [-Werror=pointer-to-int-cast]
> >>  #define __cpu_to_le64(x) ((__force __le64)(__u64)(x))
> >>                                            ^
> >> include/linux/byteorder/generic.h:86:21: note: in expansion of macro '__cpu_to_le64'
> >>  #define cpu_to_le64 __cpu_to_le64
> >>                      ^~~~~~~~~~~~~
> >> drivers/infiniband/hw/bnxt_re/qplib_fp.c:569:19: note: in expansion of macro 'cpu_to_le64'
> >>   req.srq_handle = cpu_to_le64(srq);
> >>
> >> Using a uintptr_t as an intermediate works on all architectures.
> >>
> >> Fixes: 37cb11acf1f7 ("RDMA/bnxt_re: Add SRQ support for Broadcom adapters")
> >> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> >>  drivers/infiniband/hw/bnxt_re/qplib_fp.c | 4 ++--
> >>  1 file changed, 2 insertions(+), 2 deletions(-)
> >
> > I applied the series to for-next, thanks
> 
> Hi Jason,
> 
> kernelci still reports the warning for v4.16-rc, any chance you can also send it
> as a bugfix for the current release?

As a general rule we haven't been sending sparse cleanups like this to
-rc which is why it went to -next..

Can you talk about why this is important to kernelci? I'm not familiar
at all with it.

I'm a little leary to duplicate a commit in both our branches without
a good reason??

Jason