linux-kernel - Re: [PATCH 2/2] zram: handle mem suffixes in disk size zram

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Date:	Mon, 29 Oct 2012 10:21:34 -0700
From:	Nitin Gupta <ngupta@...are.org>
To:	Sergey Senozhatsky <sergey.senozhatsky@...il.com>
CC:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] zram: handle mem suffixes in disk size zram_sysfs
 parameter

On 10/27/2012 09:03 AM, Sergey Senozhatsky wrote:
>    zram: handle mem suffixes in disk size zram_sysfs parameter
>
>    Use memparse() to allow mem suffixes in disksize sysfs number.
>    Examples:
>         echo 256K > /sys/block/zram0/disksize
>         echo 512M > /sys/block/zram0/disksize
>         echo 1G > /sys/block/zram0/disksize
>
>    Signed-off-by: Sergey Senozhatsky <sergey.senozhatsky@...il.com>
>
> ---
>
>   drivers/staging/zram/zram_sysfs.c | 8 ++++----
>   1 file changed, 4 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/staging/zram/zram_sysfs.c b/drivers/staging/zram/zram_sysfs.c
> index edb0ed4..6be318e 100644
> --- a/drivers/staging/zram/zram_sysfs.c
> +++ b/drivers/staging/zram/zram_sysfs.c
> @@ -15,6 +15,7 @@
>   #include <linux/device.h>
>   #include <linux/genhd.h>
>   #include <linux/mm.h>
> +#include <linux/kernel.h>
>
>   #include "zram_drv.h"
>
> @@ -54,13 +55,12 @@ static ssize_t disksize_show(struct device *dev,
>   static ssize_t disksize_store(struct device *dev,
>   		struct device_attribute *attr, const char *buf, size_t len)
>   {
> -	int ret;
>   	u64 disksize;
>   	struct zram *zram = dev_to_zram(dev);
>
> -	ret = kstrtoull(buf, 10, &disksize);
> -	if (ret)
> -		return ret;
> +	disksize = memparse(buf, NULL);
> +	if (disksize < 1)
> +		return -EINVAL;
>

or, just: if (!disksize) ...

Thanks,
Nitin


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