linux-kernel - Re: [PATCH] rbd: Use min_t() to fix comparison of distinct pointer types warning

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Message-ID: <518AB74B.50401@inktank.com>
Date:	Wed, 08 May 2013 15:36:27 -0500
From:	Alex Elder <elder@...tank.com>
To:	Geert Uytterhoeven <geert@...ux-m68k.org>
CC:	ceph-devel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] rbd: Use min_t() to fix comparison of distinct pointer
 types warning

On 05/08/2013 03:02 PM, Geert Uytterhoeven wrote:
> drivers/block/rbd.c: In function ‘zero_pages’:
> drivers/block/rbd.c:1102: warning: comparison of distinct pointer types lacks a cast
> 
> Remove the hackish casts and use min_t() to fix this.

Looks good to me.  I'm not sure why I didn't use that to
begin with.

I'll pull this into the ceph tree.  Thanks a lot.

Reviewed-by: Alex Elder <elder@...tank.com>

> Signed-off-by: Geert Uytterhoeven <geert@...ux-m68k.org>
> ---
>  drivers/block/rbd.c |    4 ++--
>  1 files changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/block/rbd.c b/drivers/block/rbd.c
> index 22ffd5d..1318c6b 100644
> --- a/drivers/block/rbd.c
> +++ b/drivers/block/rbd.c
> @@ -1098,8 +1098,8 @@ static void zero_pages(struct page **pages, u64 offset, u64 end)
>  		unsigned long flags;
>  		void *kaddr;
>  
> -		page_offset = (size_t)(offset & ~PAGE_MASK);
> -		length = min(PAGE_SIZE - page_offset, (size_t)(end - offset));
> +		page_offset = offset & ~PAGE_MASK;
> +		length = min_t(size_t, PAGE_SIZE - page_offset, end - offset);
>  		local_irq_save(flags);
>  		kaddr = kmap_atomic(*page);
>  		memset(kaddr + page_offset, 0, length);
> 

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