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

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Date:   Wed, 7 Mar 2018 00:25:14 +0100
From:   Arnd Bergmann <arnd@...db.de>
To:     Jason Gunthorpe <jgg@...pe.ca>
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, 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?

      Arnd