linux-kernel - Re: [PATCH v1 1/2] video: fbdev: acornfb: remove free_unused

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Date:   Thu, 28 Jan 2021 09:24:21 +0530
From:   Anshuman Khandual <anshuman.khandual@....com>
To:     David Hildenbrand <david@...hat.com>, linux-kernel@...r.kernel.org
Cc:     linux-mm@...ck.org, linux-fbdev@...r.kernel.org,
        dri-devel@...ts.freedesktop.org,
        Andrew Morton <akpm@...ux-foundation.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        "Peter Zijlstra (Intel)" <peterz@...radead.org>,
        Mike Rapoport <rppt@...nel.org>,
        Oscar Salvador <osalvador@...e.de>,
        Michal Hocko <mhocko@...nel.org>,
        Wei Yang <richard.weiyang@...ux.alibaba.com>,
        "Gustavo A. R. Silva" <gustavoars@...nel.org>,
        Sam Ravnborg <sam@...nborg.org>
Subject: Re: [PATCH v1 1/2] video: fbdev: acornfb: remove free_unused_pages()



On 1/26/21 11:51 PM, David Hildenbrand wrote:
> This function is never used and it is one of the last remaining user of
> __free_reserved_page(). Let's just drop it.
> 
> Cc: Andrew Morton <akpm@...ux-foundation.org>
> Cc: Thomas Gleixner <tglx@...utronix.de>
> Cc: "Peter Zijlstra (Intel)" <peterz@...radead.org>
> Cc: Mike Rapoport <rppt@...nel.org>
> Cc: Oscar Salvador <osalvador@...e.de>
> Cc: Michal Hocko <mhocko@...nel.org>
> Cc: Wei Yang <richard.weiyang@...ux.alibaba.com>
> Cc: "Gustavo A. R. Silva" <gustavoars@...nel.org>
> Cc: Sam Ravnborg <sam@...nborg.org>
> Signed-off-by: David Hildenbrand <david@...hat.com>

There is no other reference for free_unused_pages() in the tree.

Reviewed-by: Anshuman Khandual <anshuman.khandual@....com>

> ---
>  drivers/video/fbdev/acornfb.c | 34 ----------------------------------
>  1 file changed, 34 deletions(-)
> 
> diff --git a/drivers/video/fbdev/acornfb.c b/drivers/video/fbdev/acornfb.c
> index bcc92aecf666..1b72edc01cfb 100644
> --- a/drivers/video/fbdev/acornfb.c
> +++ b/drivers/video/fbdev/acornfb.c
> @@ -921,40 +921,6 @@ static int acornfb_detect_monitortype(void)
>  	return 4;
>  }
>  
> -/*
> - * This enables the unused memory to be freed on older Acorn machines.
> - * We are freeing memory on behalf of the architecture initialisation
> - * code here.
> - */
> -static inline void
> -free_unused_pages(unsigned int virtual_start, unsigned int virtual_end)
> -{
> -	int mb_freed = 0;
> -
> -	/*
> -	 * Align addresses
> -	 */
> -	virtual_start = PAGE_ALIGN(virtual_start);
> -	virtual_end = PAGE_ALIGN(virtual_end);
> -
> -	while (virtual_start < virtual_end) {
> -		struct page *page;
> -
> -		/*
> -		 * Clear page reserved bit,
> -		 * set count to 1, and free
> -		 * the page.
> -		 */
> -		page = virt_to_page(virtual_start);
> -		__free_reserved_page(page);
> -
> -		virtual_start += PAGE_SIZE;
> -		mb_freed += PAGE_SIZE / 1024;
> -	}
> -
> -	printk("acornfb: freed %dK memory\n", mb_freed);
> -}
> -
>  static int acornfb_probe(struct platform_device *dev)
>  {
>  	unsigned long size;
>