linux-kernel - Re: [PATCH] media: usb: uvc: uvc_driver: Added a function pr_info() in uvc_driver and staging: android: Decleared file operation with const keyword in android keyword

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Date:   Thu, 15 Jul 2021 23:04:06 +0300
From:   Laurent Pinchart <laurent.pinchart@...asonboard.com>
To:     Saptarshi Patra <saptarshi.patra.22@...il.com>
Cc:     Mauro Carvalho Chehab <mchehab@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Arve Hjønnevåg <arve@...roid.com>,
        Todd Kjos <tkjos@...roid.com>,
        Martijn Coenen <maco@...roid.com>,
        Joel Fernandes <joel@...lfernandes.org>,
        Christian Brauner <christian@...uner.io>,
        Hridya Valsaraju <hridya@...gle.com>,
        Suren Baghdasaryan <surenb@...gle.com>,
        linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-staging@...ts.linux.dev
Subject: Re: [PATCH] media: usb: uvc: uvc_driver: Added a function pr_info()
 in uvc_driver and staging: android: Decleared file operation with const
 keyword in android keyword

Hi Saptarshi,

On Fri, Jul 16, 2021 at 01:19:10AM +0530, Saptarshi Patra wrote:
> media: usb: uvc: uvc_driver: Decleared a function called
>  pr_info()  with a string input "I changed uvcvideo driver in the Linux
>  Kernel"
> 
> Added the function pr_info() to see the message / input string using dmesg

I'm curious, could you explain why you think this should be merged in
the upstream kernel ? I fear the kernel log may get a bit too verbose if
everybody added their own little message :-)

> staging: android: Decleared file operation with const keyword

Don't combine multiple independent changes in a single patch.

> Warning found by the checkpatch.pl script
> 
> Signed-off-by: Saptarshi Patra <saptarshi.patra.22@...il.com>
> ---
>  drivers/media/usb/uvc/uvc_driver.c | 2 +-
>  drivers/staging/android/ashmem.c   | 2 +-
>  2 files changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/media/usb/uvc/uvc_driver.c b/drivers/media/usb/uvc/uvc_driver.c
> index 9a791d8ef200..0b47ca75091b 100644
> --- a/drivers/media/usb/uvc/uvc_driver.c
> +++ b/drivers/media/usb/uvc/uvc_driver.c
> @@ -2352,7 +2352,7 @@ static int uvc_probe(struct usb_interface *intf,
>  		(const struct uvc_device_info *)id->driver_info;
>  	int function;
>  	int ret;
> -
> +	pr_info("I changed uvcvideo driver in the Linux Kernel\n");
>  	/* Allocate memory for the device and initialize it. */
>  	dev = kzalloc(sizeof(*dev), GFP_KERNEL);
>  	if (dev == NULL)
> diff --git a/drivers/staging/android/ashmem.c b/drivers/staging/android/ashmem.c
> index ddbde3f8430e..4c6b420fbf4d 100644
> --- a/drivers/staging/android/ashmem.c
> +++ b/drivers/staging/android/ashmem.c
> @@ -377,7 +377,7 @@ ashmem_vmfile_get_unmapped_area(struct file *file, unsigned long addr,
>  
>  static int ashmem_mmap(struct file *file, struct vm_area_struct *vma)
>  {
> -	static struct file_operations vmfile_fops;
> +	static const struct file_operations vmfile_fops;

You haven't compiled this, have you ?

>  	struct ashmem_area *asma = file->private_data;
>  	int ret = 0;
>  

-- 
Regards,

Laurent Pinchart