linux-kernel - Re: [PATCH 1/1] mtd: spi-nor: remove WARN_ONCE() message in spi_nor

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Date:   Thu, 8 Dec 2016 16:31:09 +0100
From:   Boris Brezillon <boris.brezillon@...e-electrons.com>
To:     Cyrille Pitchen <cyrille.pitchen@...el.com>
Cc:     <marek.vasut@...il.com>, <computersforpeace@...il.com>,
        <richard@....at>, <linux-mtd@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/1] mtd: spi-nor: remove WARN_ONCE() message in
 spi_nor_write()

On Tue, 6 Dec 2016 18:14:24 +0100
Cyrille Pitchen <cyrille.pitchen@...el.com> wrote:

> This patch removes the WARN_ONCE() test in spi_nor_write().
> This macro triggers the display of a warning message almost every time we
> use a UBI file-system because a write operation is performed at offset 64,
> which is in the middle of the SPI NOR memory page. This is a valid
> operation for ubifs.
> 
> Hence this warning is pretty annoying and useless so we just remove it.
> 
> Signed-off-by: Cyrille Pitchen <cyrille.pitchen@...el.com>
> Suggested-by: Richard Weinberger <richard@....at>
> Suggested-by: Andras Szemzo <szemzo.andras@...il.com>

Acked-by: Boris Brezillon <boris.brezillon@...e-electrons.com>

> ---
>  drivers/mtd/spi-nor/spi-nor.c | 3 ---
>  1 file changed, 3 deletions(-)
> 
> diff --git a/drivers/mtd/spi-nor/spi-nor.c b/drivers/mtd/spi-nor/spi-nor.c
> index c9bcd05ca5d9..cdeb2c6b1492 100644
> --- a/drivers/mtd/spi-nor/spi-nor.c
> +++ b/drivers/mtd/spi-nor/spi-nor.c
> @@ -1265,9 +1265,6 @@ static int spi_nor_write(struct mtd_info *mtd, loff_t to, size_t len,
>  		ssize_t written;
>  
>  		page_offset = (to + i) & (nor->page_size - 1);
> -		WARN_ONCE(page_offset,
> -			  "Writing at offset %zu into a NOR page. Writing partial pages may decrease reliability and increase wear of NOR flash.",
> -			  page_offset);
>  		/* the size of data remaining on the first page */
>  		page_remain = min_t(size_t,
>  				    nor->page_size - page_offset, len - i);