linux-kernel - Re: [PATCH] greybus: remove unused header variable in gb_operation_message

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Date:   Sat, 28 Jan 2023 18:47:05 +0100
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Tom Rix <trix@...hat.com>
Cc:     johan@...nel.org, elder@...nel.org, greybus-dev@...ts.linaro.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] greybus: remove unused header variable in
 gb_operation_message_alloc()

On Sat, Jan 28, 2023 at 07:57:06AM -0800, Tom Rix wrote:
> cppcheck reports
> drivers/greybus/operation.c:365:31: style: Variable 'header' is not assigned a value. [unassignedVariable]
>  struct gb_operation_msg_hdr *header;
>                               ^

That's not a real problem.

> header is only used to calculate the size of the messge.  This can be done without a variable
> but rather with calling sizeof() with the struct type.
> 
> Fixes: dc779229b538 ("greybus: introduce gb_operation_message_init()")

This is not a bug that is being fixed.

> Signed-off-by: Tom Rix <trix@...hat.com>
> ---
>  drivers/greybus/operation.c | 3 +--
>  1 file changed, 1 insertion(+), 2 deletions(-)
> 
> diff --git a/drivers/greybus/operation.c b/drivers/greybus/operation.c
> index 8459e9bc0749..9d322fc6531b 100644
> --- a/drivers/greybus/operation.c
> +++ b/drivers/greybus/operation.c
> @@ -362,8 +362,7 @@ gb_operation_message_alloc(struct gb_host_device *hd, u8 type,
>  			   size_t payload_size, gfp_t gfp_flags)
>  {
>  	struct gb_message *message;
> -	struct gb_operation_msg_hdr *header;
> -	size_t message_size = payload_size + sizeof(*header);
> +	size_t message_size = payload_size + sizeof(struct gb_operation_msg_hdr);

The compiler does not use any extra room for header, so this should be
fine, it's not a real issue.

cppcheck almost never finds anything real, be careful...

thanks,

greg k-h