linux-kernel - Re: [PATCH 4/9] staging: sm750fb: removing unnecessary binary operations

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Date:   Mon, 15 May 2017 12:21:38 +0200
From:   Greg KH <greg@...ah.com>
To:     Matej Dujava <mdujava@...urkovo.cz>
Cc:     Sudip Mukherjee <sudipm.mukherjee@...il.com>,
        Teddy Wang <teddy.wang@...iconmotion.com>,
        devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 4/9] staging: sm750fb: removing unnecessary binary
 operations

On Sun, May 14, 2017 at 12:42:37AM +0200, Matej Dujava wrote:
> This patch remove unnecessary operation (eg. ``X | (0x0 << Y)`` to ``X``).
> 
> Signed-off-by: Matej Dujava <mdujava@...urkovo.cz>
> ---
>  drivers/staging/sm750fb/ddk750_display.h | 32 ++++++++++++++++----------------
>  1 file changed, 16 insertions(+), 16 deletions(-)
> 
> diff --git a/drivers/staging/sm750fb/ddk750_display.h b/drivers/staging/sm750fb/ddk750_display.h
> index cef7f46..f9e1614 100644
> --- a/drivers/staging/sm750fb/ddk750_display.h
> +++ b/drivers/staging/sm750fb/ddk750_display.h
> @@ -9,8 +9,8 @@
>  #define PNL_2_OFFSET	0
>  #define PNL_2_MASK	(3 << PNL_2_OFFSET)
>  #define PNL_2_USAGE	(PNL_2_MASK << 16)
> -#define PNL_2_PRI	((0 << PNL_2_OFFSET) | PNL_2_USAGE)
> -#define PNL_2_SEC	((2 << PNL_2_OFFSET) | PNL_2_USAGE)
> +#define PNL_2_PRI	(PNL_2_USAGE)
> +#define PNL_2_SEC	(PNL_2_USAGE | (2 << PNL_2_OFFSET))

But the original makes more sense to read, don't you think so?

thanks,

greg k-h