linux-kernel - Re: [PATCH] zram: fix unused 'zram_wb

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Date:   Tue, 12 Jul 2022 22:17:44 +0800
From:   Kefeng Wang <wangkefeng.wang@...wei.com>
To:     Minchan Kim <minchan@...nel.org>, Nitin Gupta <ngupta@...are.org>,
        "Sergey Senozhatsky" <senozhatsky@...omium.org>,
        Jens Axboe <axboe@...nel.dk>, <linux-kernel@...r.kernel.org>
CC:     <linux-block@...r.kernel.org>, Linux MM <linux-mm@...ck.org>,
        "Andrew Morton" <akpm@...ux-foundation.org>
Subject: Re: [PATCH] zram: fix unused 'zram_wb_devops' warning

+mm,  kindly ping...

On 2022/6/8 15:25, Kefeng Wang wrote:
> drivers/block/zram/zram_drv.c:55:45: warning: 'zram_wb_devops' defined but not used [-Wunused-const-variable=]
>
> Fix the above warning if CONFIG_ZRAM_WRITEBACK not enabled.
>
> Signed-off-by: Kefeng Wang <wangkefeng.wang@...wei.com>
> ---
>   drivers/block/zram/zram_drv.c | 2 ++
>   1 file changed, 2 insertions(+)
>
> diff --git a/drivers/block/zram/zram_drv.c b/drivers/block/zram/zram_drv.c
> index 39cd1397ed3b..fff5eb4d3f20 100644
> --- a/drivers/block/zram/zram_drv.c
> +++ b/drivers/block/zram/zram_drv.c
> @@ -52,7 +52,9 @@ static unsigned int num_devices = 1;
>   static size_t huge_class_size;
>   
>   static const struct block_device_operations zram_devops;
> +#ifdef CONFIG_ZRAM_WRITEBACK
>   static const struct block_device_operations zram_wb_devops;
> +#endif
>   
>   static void zram_free_page(struct zram *zram, size_t index);
>   static int zram_bvec_read(struct zram *zram, struct bio_vec *bvec,