linux-kernel - Re: [PATCH] remoteproc: rcar_rproc: silince address space sparse warning

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Date:   Tue, 23 Aug 2022 13:26:18 -0600
From:   Mathieu Poirier <mathieu.poirier@...aro.org>
To:     Kefeng Wang <wangkefeng.wang@...wei.com>
Cc:     Julien Massot <julien.massot@....bzh>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        linux-remoteproc@...r.kernel.org,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        linux-kernel@...r.kernel.org, rmk+kernel@...linux.org.uk,
        kernel test robot <lkp@...el.com>
Subject: Re: [PATCH] remoteproc: rcar_rproc: silince address space sparse
 warning

On Mon, Aug 08, 2022 at 09:16:09AM +0800, Kefeng Wang wrote:
> Fix sparse warnings,
>    drivers/remoteproc/st_remoteproc.c:98:12: sparse: sparse: incorrect type in assignment (different address spaces) @@
> 	   expected void *va @@     got void [noderef] __iomem * @@
>    drivers/remoteproc/st_remoteproc.c:98:12: sparse:     expected void *va
>    drivers/remoteproc/st_remoteproc.c:98:12: sparse:     got void [noderef] __iomem *
>    ...
>    drivers/remoteproc/st_remoteproc.c:114:20: sparse:     expected void volatile [noderef] __iomem *io_addr
>    drivers/remoteproc/st_remoteproc.c:114:20: sparse:     got void *va
> 
> Add __iomem to io address space 'va' to fix it.
> 
> Reported-by: kernel test robot <lkp@...el.com>
> Signed-off-by: Kefeng Wang <wangkefeng.wang@...wei.com>
> ---
> note: the commit d803336abdbc "(ARM: mm: kill unused runtime hook arch_iounmap())"
> won't introduce the warning, but lkp report issue to me many times,
> let's fix it.
> 
>  drivers/remoteproc/rcar_rproc.c | 2 +-
>  include/linux/remoteproc.h      | 2 +-
>  2 files changed, 2 insertions(+), 2 deletions(-)
> 

$ ./scripts/checkpatch.pl _PATCH_remoteproc_rcar_rproc_silince_address_space_sparse_warning.patch 
WARNING: A patch subject line should describe the change not the tool that found it
#9: 
Subject: [PATCH] remoteproc: rcar_rproc: silince address space sparse warning

total: 0 errors, 1 warnings, 16 lines checked

NOTE: For some of the reported defects, checkpatch may be able to
      mechanically convert to the typical style using --fix or --fix-inplace.

_PATCH_remoteproc_rcar_rproc_silince_address_space_sparse_warning.patch has style problems, please review.

NOTE: If any of the errors are false positives, please report
      them to the maintainer, see CHECKPATCH in MAINTAINERS.


> diff --git a/drivers/remoteproc/rcar_rproc.c b/drivers/remoteproc/rcar_rproc.c
> index aa86154109c7..e3363a4cde0a 100644
> --- a/drivers/remoteproc/rcar_rproc.c
> +++ b/drivers/remoteproc/rcar_rproc.c
> @@ -22,7 +22,7 @@ static int rcar_rproc_mem_alloc(struct rproc *rproc,
>  				 struct rproc_mem_entry *mem)
>  {
>  	struct device *dev = &rproc->dev;
> -	void *va;
> +	void __iomem *va;
>  
>  	dev_dbg(dev, "map memory: %pa+%zx\n", &mem->dma, mem->len);
>  	va = ioremap_wc(mem->dma, mem->len);
> diff --git a/include/linux/remoteproc.h b/include/linux/remoteproc.h
> index 7c943f0a2fc4..c0c950cf7d72 100644
> --- a/include/linux/remoteproc.h
> +++ b/include/linux/remoteproc.h
> @@ -330,7 +330,7 @@ struct rproc;
>   * @alloc: specific memory allocator function
>   */
>  struct rproc_mem_entry {
> -	void *va;
> +	void __iomem *va;
>  	bool is_iomem;
>  	dma_addr_t dma;
>  	size_t len;
> -- 
> 2.35.3
>