linux-kernel - Re: [PATCH -next] debugobjects: Convert to DEFINE_SHOW

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Date:   Fri, 17 Jul 2020 22:26:24 +0200
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Qinglang Miao <miaoqinglang@...wei.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Marco Elver <elver@...gle.com>, Qian Cai <cai@....pw>
Cc:     linux-kernel@...r.kernel.org, Christoph Hellwig <hch@....de>
Subject: Re: [PATCH -next] debugobjects: Convert to DEFINE_SHOW_ATTRIBUTE

Qinglang Miao <miaoqinglang@...wei.com> writes:
> Use DEFINE_SHOW_ATTRIBUTE macro to simplify the code.
>
> Signed-off-by: Qinglang Miao <miaoqinglang@...wei.com>
> ---
>  lib/debugobjects.c | 12 +-----------
>  1 file changed, 1 insertion(+), 11 deletions(-)
>
> diff --git a/lib/debugobjects.c b/lib/debugobjects.c
> index 5d2bbfc55..916a5c492 100644
> --- a/lib/debugobjects.c
> +++ b/lib/debugobjects.c
> @@ -1023,17 +1023,7 @@ static int debug_stats_show(struct seq_file *m, void *v)
>  	return 0;
>  }
>  
> -static int debug_stats_open(struct inode *inode, struct file *filp)
> -{
> -	return single_open(filp, debug_stats_show, NULL);
> -}
> -
> -static const struct file_operations debug_stats_fops = {
> -	.open		= debug_stats_open,
> -	.read_iter		= seq_read_iter,

This does not apply against mainline, so I assume this malformatted
thing comes from Christophs seq_read_iter changes in -next.

The seq_read_iter here makes no sense whatsoever if the same thing can
be achieved by using

> +DEFINE_SHOW_ATTRIBUTE(debug_stats);

and fixing it at the generic level.

Thanks,

        tglx