linux-kernel - Re: [PATCH] RDMA/srpt: fix function pointer cast warnings

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Date: Wed, 14 Feb 2024 11:21:44 +0200
From: Leon Romanovsky <leon@...nel.org>
To: Arnd Bergmann <arnd@...nel.org>
Cc: Bart Van Assche <bvanassche@....org>, Arnd Bergmann <arnd@...db.de>,
	Jason Gunthorpe <jgg@...pe.ca>,
	Nathan Chancellor <nathan@...nel.org>,
	Nick Desaulniers <ndesaulniers@...gle.com>,
	Bill Wendling <morbo@...gle.com>,
	Justin Stitt <justinstitt@...gle.com>,
	"Martin K. Petersen" <martin.petersen@...cle.com>,
	"Nicholas A. Bellinger" <nab@...ingtidesystems.com>,
	linux-rdma@...r.kernel.org, target-devel@...r.kernel.org,
	linux-kernel@...r.kernel.org, llvm@...ts.linux.dev
Subject: Re: [PATCH] RDMA/srpt: fix function pointer cast warnings

On Tue, Feb 13, 2024 at 11:07:13AM +0100, Arnd Bergmann wrote:
> From: Arnd Bergmann <arnd@...db.de>
> 
> clang-16 notices that srpt_qp_event() gets called through an incompatible
> pointer here:
> 
> drivers/infiniband/ulp/srpt/ib_srpt.c:1815:5: error: cast from 'void (*)(struct ib_event *, struct srpt_rdma_ch *)' to 'void (*)(struct ib_event *, void *)' converts to incompatible function type [-Werror,-Wcast-function-type-strict]
>  1815 |                 = (void(*)(struct ib_event *, void*))srpt_qp_event;
> 
> Change srpt_qp_event() to use the correct prototype and adjust the
> argument inside of it.
> 
> Fixes: a42d985bd5b2 ("ib_srpt: Initial SRP Target merge for v3.3-rc1")
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> ---
>  drivers/infiniband/ulp/srpt/ib_srpt.c | 7 ++++---
>  1 file changed, 4 insertions(+), 3 deletions(-)


This patch generates the following warnings, fixed and applied.
➜  kernel git:(wip/leon-for-rc) mkt ci
f17a855457db (HEAD -> build) RDMA/srpt: fix function pointer cast warnings
drivers/infiniband/ulp/srpt/ib_srpt.c:220: warning: Function parameter or struct member 'ptr' not described in 'srpt_qp_event'
drivers/infiniband/ulp/srpt/ib_srpt.c:220: warning: Excess function parameter 'ch' description in 'srpt_qp_event'
drivers/infiniband/ulp/srpt/ib_srpt.c:220: warning: Function parameter or struct member 'ptr' not described in 'srpt_qp_event'
drivers/infiniband/ulp/srpt/ib_srpt.c:220: warning: Excess function parameter 'ch' description in 'srpt_qp_event'


> 
> diff --git a/drivers/infiniband/ulp/srpt/ib_srpt.c b/drivers/infiniband/ulp/srpt/ib_srpt.c
> index 0875f197118f..942b311b6296 100644
> --- a/drivers/infiniband/ulp/srpt/ib_srpt.c
> +++ b/drivers/infiniband/ulp/srpt/ib_srpt.c
> @@ -216,8 +216,10 @@ static const char *get_ch_state_name(enum rdma_ch_state s)
>   * @event: Description of the event that occurred.
>   * @ch: SRPT RDMA channel.
>   */
> -static void srpt_qp_event(struct ib_event *event, struct srpt_rdma_ch *ch)
> +static void srpt_qp_event(struct ib_event *event, void *ptr)
>  {
> +	struct srpt_rdma_ch *ch = ptr;
> +
>  	pr_debug("QP event %d on ch=%p sess_name=%s-%d state=%s\n",
>  		 event->event, ch, ch->sess_name, ch->qp->qp_num,
>  		 get_ch_state_name(ch->state));
> @@ -1811,8 +1813,7 @@ static int srpt_create_ch_ib(struct srpt_rdma_ch *ch)
>  	ch->cq_size = ch->rq_size + sq_size;
>  
>  	qp_init->qp_context = (void *)ch;
> -	qp_init->event_handler
> -		= (void(*)(struct ib_event *, void*))srpt_qp_event;
> +	qp_init->event_handler = srpt_qp_event;
>  	qp_init->send_cq = ch->cq;
>  	qp_init->recv_cq = ch->cq;
>  	qp_init->sq_sig_type = IB_SIGNAL_REQ_WR;
> -- 
> 2.39.2
>