2022-12-16 00:32:40

by Palmer Dabbelt

Subject: [PATCH] RDMA/rxe: Avoid unused variable warnings on 32-bit targets

From: Palmer Dabbelt <[email protected]>

These variables are not used on 32-bit targets as there's a big ifdef
around their use. This results on a handful of warnings for 32-bit
RISC-V allyesconfig:

CC drivers/infiniband/sw/rxe/rxe_resp.o
linux/drivers/infiniband/sw/rxe/rxe_resp.c: In function 'atomic_write_reply':
linux/drivers/infiniband/sw/rxe/rxe_resp.c:794:13: error: unused variable 'payload' [-Werror=unused-variable]
794 | int payload = payload_size(pkt);
| ^~~~~~~
linux/drivers/infiniband/sw/rxe/rxe_resp.c:793:24: error: unused variable 'mr' [-Werror=unused-variable]
793 | struct rxe_mr *mr = qp->resp.mr;
| ^~
linux/drivers/infiniband/sw/rxe/rxe_resp.c:791:19: error: unused variable 'dst' [-Werror=unused-variable]
791 | u64 src, *dst;
| ^~~
linux/drivers/infiniband/sw/rxe/rxe_resp.c:791:13: error: unused variable 'src' [-Werror=unused-variable]
791 | u64 src, *dst;
| ^~~
cc1: all warnings being treated as errors

Fixes: 034e285f8b99 ("RDMA/rxe: Make responder support atomic write on RC service")
Signed-off-by: Palmer Dabbelt <[email protected]>
---
drivers/infiniband/sw/rxe/rxe_resp.c | 8 ++++----
1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/infiniband/sw/rxe/rxe_resp.c b/drivers/infiniband/sw/rxe/rxe_resp.c
index 7a60c7709da0..18977d5a3316 100644
--- a/drivers/infiniband/sw/rxe/rxe_resp.c
+++ b/drivers/infiniband/sw/rxe/rxe_resp.c
@@ -788,10 +788,10 @@ static enum resp_states atomic_reply(struct rxe_qp *qp,
static enum resp_states atomic_write_reply(struct rxe_qp *qp,
struct rxe_pkt_info *pkt)
{
- u64 src, *dst;
- struct resp_res *res = qp->resp.res;
- struct rxe_mr *mr = qp->resp.mr;
- int payload = payload_size(pkt);
+ __maybe_unused u64 src, *dst;
+ __maybe_unused struct resp_res *res = qp->resp.res;
+ __maybe_unused struct rxe_mr *mr = qp->resp.mr;
+ __maybe_unused int payload = payload_size(pkt);

if (!res) {
res = rxe_prepare_res(qp, pkt, RXE_ATOMIC_WRITE_MASK);
--
2.38.1

2022-12-16 03:35:53

by Zhu Yanjun

Subject: Re: [PATCH] RDMA/rxe: Avoid unused variable warnings on 32-bit targets

在 2022/12/16 7:28, Palmer Dabbelt 写道:
> From: Palmer Dabbelt <[email protected]>
>

In
https://patchwork.kernel.org/project/linux-rdma/patch/[email protected]/

In this link, it seems that a similar commit for this problem.
Please check it.

Thanks
Zhu Yanjun

> These variables are not used on 32-bit targets as there's a big ifdef
> around their use. This results on a handful of warnings for 32-bit
> RISC-V allyesconfig:
>
> CC drivers/infiniband/sw/rxe/rxe_resp.o
> linux/drivers/infiniband/sw/rxe/rxe_resp.c: In function 'atomic_write_reply':
> linux/drivers/infiniband/sw/rxe/rxe_resp.c:794:13: error: unused variable 'payload' [-Werror=unused-variable]
> 794 | int payload = payload_size(pkt);
> | ^~~~~~~
> linux/drivers/infiniband/sw/rxe/rxe_resp.c:793:24: error: unused variable 'mr' [-Werror=unused-variable]
> 793 | struct rxe_mr *mr = qp->resp.mr;
> | ^~
> linux/drivers/infiniband/sw/rxe/rxe_resp.c:791:19: error: unused variable 'dst' [-Werror=unused-variable]
> 791 | u64 src, *dst;
> | ^~~
> linux/drivers/infiniband/sw/rxe/rxe_resp.c:791:13: error: unused variable 'src' [-Werror=unused-variable]
> 791 | u64 src, *dst;
> | ^~~
> cc1: all warnings being treated as errors
>
> Fixes: 034e285f8b99 ("RDMA/rxe: Make responder support atomic write on RC service")
> Signed-off-by: Palmer Dabbelt <[email protected]>
> ---
> drivers/infiniband/sw/rxe/rxe_resp.c | 8 ++++----
> 1 file changed, 4 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/infiniband/sw/rxe/rxe_resp.c b/drivers/infiniband/sw/rxe/rxe_resp.c
> index 7a60c7709da0..18977d5a3316 100644
> --- a/drivers/infiniband/sw/rxe/rxe_resp.c
> +++ b/drivers/infiniband/sw/rxe/rxe_resp.c
> @@ -788,10 +788,10 @@ static enum resp_states atomic_reply(struct rxe_qp *qp,
> static enum resp_states atomic_write_reply(struct rxe_qp *qp,
> struct rxe_pkt_info *pkt)
> {
> - u64 src, *dst;
> - struct resp_res *res = qp->resp.res;
> - struct rxe_mr *mr = qp->resp.mr;
> - int payload = payload_size(pkt);
> + __maybe_unused u64 src, *dst;
> + __maybe_unused struct resp_res *res = qp->resp.res;
> + __maybe_unused struct rxe_mr *mr = qp->resp.mr;
> + __maybe_unused int payload = payload_size(pkt);
>
> if (!res) {
> res = rxe_prepare_res(qp, pkt, RXE_ATOMIC_WRITE_MASK);

2022-12-16 16:45:12

by Palmer Dabbelt

Subject: Re: [PATCH] RDMA/rxe: Avoid unused variable warnings on 32-bit targets

On Thu, 15 Dec 2022 19:11:39 PST (-0800), [email protected] wrote:
> 在 2022/12/16 7:28, Palmer Dabbelt 写道:
>> From: Palmer Dabbelt <[email protected]>
>>
>
> In
> https://patchwork.kernel.org/project/linux-rdma/patch/[email protected]/
>
> In this link, it seems that a similar commit for this problem.
> Please check it.

That one also fixes the compile issues for me.

>
> Thanks
> Zhu Yanjun
>
>> These variables are not used on 32-bit targets as there's a big ifdef
>> around their use. This results on a handful of warnings for 32-bit
>> RISC-V allyesconfig:
>>
>> CC drivers/infiniband/sw/rxe/rxe_resp.o
>> linux/drivers/infiniband/sw/rxe/rxe_resp.c: In function 'atomic_write_reply':
>> linux/drivers/infiniband/sw/rxe/rxe_resp.c:794:13: error: unused variable 'payload' [-Werror=unused-variable]
>> 794 | int payload = payload_size(pkt);
>> | ^~~~~~~
>> linux/drivers/infiniband/sw/rxe/rxe_resp.c:793:24: error: unused variable 'mr' [-Werror=unused-variable]
>> 793 | struct rxe_mr *mr = qp->resp.mr;
>> | ^~
>> linux/drivers/infiniband/sw/rxe/rxe_resp.c:791:19: error: unused variable 'dst' [-Werror=unused-variable]
>> 791 | u64 src, *dst;
>> | ^~~
>> linux/drivers/infiniband/sw/rxe/rxe_resp.c:791:13: error: unused variable 'src' [-Werror=unused-variable]
>> 791 | u64 src, *dst;
>> | ^~~
>> cc1: all warnings being treated as errors
>>
>> Fixes: 034e285f8b99 ("RDMA/rxe: Make responder support atomic write on RC service")
>> Signed-off-by: Palmer Dabbelt <[email protected]>
>> ---
>> drivers/infiniband/sw/rxe/rxe_resp.c | 8 ++++----
>> 1 file changed, 4 insertions(+), 4 deletions(-)
>>
>> diff --git a/drivers/infiniband/sw/rxe/rxe_resp.c b/drivers/infiniband/sw/rxe/rxe_resp.c
>> index 7a60c7709da0..18977d5a3316 100644
>> --- a/drivers/infiniband/sw/rxe/rxe_resp.c
>> +++ b/drivers/infiniband/sw/rxe/rxe_resp.c
>> @@ -788,10 +788,10 @@ static enum resp_states atomic_reply(struct rxe_qp *qp,
>> static enum resp_states atomic_write_reply(struct rxe_qp *qp,
>> struct rxe_pkt_info *pkt)
>> {
>> - u64 src, *dst;
>> - struct resp_res *res = qp->resp.res;
>> - struct rxe_mr *mr = qp->resp.mr;
>> - int payload = payload_size(pkt);
>> + __maybe_unused u64 src, *dst;
>> + __maybe_unused struct resp_res *res = qp->resp.res;
>> + __maybe_unused struct rxe_mr *mr = qp->resp.mr;
>> + __maybe_unused int payload = payload_size(pkt);
>>
>> if (!res) {
>> res = rxe_prepare_res(qp, pkt, RXE_ATOMIC_WRITE_MASK);