linux-kernel - Re: [PATCH] habanalabs: change unused extern decl of hdev to forward decl of hl

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Date:   Mon, 13 Feb 2023 08:12:41 +0100
From:   Stanislaw Gruszka <stanislaw.gruszka@...ux.intel.com>
To:     Tom Rix <trix@...hat.com>
Cc:     ogabbay@...nel.org, nathan@...nel.org, ndesaulniers@...gle.com,
        kelbaz@...ana.ai, llvm@...ts.linux.dev,
        linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org
Subject: Re: [PATCH] habanalabs: change unused extern decl of hdev to forward
 decl of hl_device

On Wed, Feb 08, 2023 at 07:54:50AM -0800, Tom Rix wrote:
> Building with clang W=2 has several similar warnings
> drivers/accel/habanalabs/common/decoder.c:46:51: error: declaration shadows a variable in the global scope [-Werror,-Wshadow]
> static void dec_error_intr_work(struct hl_device *hdev, u32 base_addr, u32 core_id)
>                                                   ^
> drivers/accel/habanalabs/common/security.h:13:26: note: previous declaration is here
> extern struct hl_device *hdev;
>                          ^
> 
> There is no global definition of hdev, so the extern is not needed.
> Searched with
> grep -r '^struct' . | grep hl_dev
> 
> Change to an forward decl to resolve these issues
> drivers/accel/habanalabs/common/mmu/../security.h:133:40: error: ‘struct hl_device’ declared inside parameter list will not be visible outside of this definition or declaration [-Werror]
>   133 |         bool (*skip_block_hook)(struct hl_device *hdev,
>       |                                        ^~~~~~~~~
> 
> Signed-off-by: Tom Rix <trix@...hat.com>
Reviewed-by: Stanislaw Gruszka <stanislaw.gruszka@...ux.intel.com>

> ---
>  drivers/accel/habanalabs/common/security.h | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/accel/habanalabs/common/security.h b/drivers/accel/habanalabs/common/security.h
> index 234b4a6ed8bc..d7a3b3e82ea4 100644
> --- a/drivers/accel/habanalabs/common/security.h
> +++ b/drivers/accel/habanalabs/common/security.h
> @@ -10,7 +10,7 @@
>  
>  #include <linux/io-64-nonatomic-lo-hi.h>
>  
> -extern struct hl_device *hdev;
> +struct hl_device;
>  
>  /* special blocks */
>  #define HL_MAX_NUM_OF_GLBL_ERR_CAUSE		10
> -- 
> 2.26.3
>