linux-kernel - Re: [PATCH] lightnvm: assume 64-bit lba numbers

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Message-ID: <0c7f0894-4817-09c4-93b9-8158bbc6a562@cnexlabs.com>
Date:   Wed, 19 Apr 2017 20:04:13 +0200
From:   Matias Bjørling <matias@...xlabs.com>
To:     Arnd Bergmann <arnd@...db.de>, Matias Bjorling <mb@...htnvm.io>
CC:     Javier González <jg@...htnvm.io>,
        Jens Axboe <axboe@...com>, <linux-block@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] lightnvm: assume 64-bit lba numbers

On 04/19/2017 07:39 PM, Arnd Bergmann wrote:
> The driver uses both u64 and sector_t to refer to offsets, and assigns between the
> two. This causes one harmless warning when sector_t is 32-bit:
>
> drivers/lightnvm/pblk-rb.c: In function 'pblk_rb_write_entry_gc':
> include/linux/lightnvm.h:215:20: error: large integer implicitly truncated to unsigned type [-Werror=overflow]
> drivers/lightnvm/pblk-rb.c:324:22: note: in expansion of macro 'ADDR_EMPTY'
>
> As the driver is already doing this inconsistently, changing the type
> won't make it worse and is an easy way to avoid the warning.
>
> Fixes: a4bd217b4326 ("lightnvm: physical block device (pblk) target")
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> ---
>  drivers/lightnvm/pblk.h | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/lightnvm/pblk.h b/drivers/lightnvm/pblk.h
> index c82120ce3be5..11ed7d83f572 100644
> --- a/drivers/lightnvm/pblk.h
> +++ b/drivers/lightnvm/pblk.h
> @@ -119,7 +119,7 @@ struct pblk_w_ctx {
>  	struct bio_list bios;		/* Original bios - used for completion
>  					 * in REQ_FUA, REQ_FLUSH case
>  					 */
> -	sector_t lba;			/* Logic addr. associated with entry */
> +	u64 lba;			/* Logic addr. associated with entry */
>  	struct ppa_addr ppa;		/* Physic addr. associated with entry */
>  	int flags;			/* Write context flags */
>  };
>

Thanks Arnd. Jens, could you pick this up? Thank you