linux-kernel - Re: [PATCH] fs: adjust dirtytime_interval_handler definition to match prototype

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Date:   Tue, 8 Sep 2020 13:31:10 +0200
From:   Jan Kara <jack@...e.cz>
To:     Tobias Klauser <tklauser@...tanz.ch>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        Christoph Hellwig <hch@....de>,
        Al Viro <viro@...iv.linux.org.uk>
Subject: Re: [PATCH] fs: adjust dirtytime_interval_handler definition to
 match prototype

On Mon 07-09-20 11:31:40, Tobias Klauser wrote:
> Commit 32927393dc1c ("sysctl: pass kernel pointers to ->proc_handler")
> changed ctl_table.proc_handler to take a kernel pointer. Adjust the
> definition of dirtytime_interval_handler to match its prototype in
> linux/writeback.h which fixes the following sparse error/warning:
> 
> fs/fs-writeback.c:2189:50: warning: incorrect type in argument 3 (different address spaces)
> fs/fs-writeback.c:2189:50:    expected void *
> fs/fs-writeback.c:2189:50:    got void [noderef] __user *buffer
> fs/fs-writeback.c:2184:5: error: symbol 'dirtytime_interval_handler' redeclared with different type (incompatible argument 3 (different address spaces)):
> fs/fs-writeback.c:2184:5:    int extern [addressable] [signed] [toplevel] dirtytime_interval_handler( ... )
> fs/fs-writeback.c: note: in included file:
> ./include/linux/writeback.h:374:5: note: previously declared as:
> ./include/linux/writeback.h:374:5:    int extern [addressable] [signed] [toplevel] dirtytime_interval_handler( ... )
> 
> Fixes: 32927393dc1c ("sysctl: pass kernel pointers to ->proc_handler")
> Cc: Christoph Hellwig <hch@....de>
> Cc: Al Viro <viro@...iv.linux.org.uk>
> Signed-off-by: Tobias Klauser <tklauser@...tanz.ch>

Thanks! The patch looks good to me. You can add:

Reviewed-by: Jan Kara <jack@...e.cz>

								Honza

> ---
>  fs/fs-writeback.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/fs/fs-writeback.c b/fs/fs-writeback.c
> index 149227160ff0..58b27e4070a3 100644
> --- a/fs/fs-writeback.c
> +++ b/fs/fs-writeback.c
> @@ -2184,7 +2184,7 @@ static int __init start_dirtytime_writeback(void)
>  __initcall(start_dirtytime_writeback);
>  
>  int dirtytime_interval_handler(struct ctl_table *table, int write,
> -			       void __user *buffer, size_t *lenp, loff_t *ppos)
> +			       void *buffer, size_t *lenp, loff_t *ppos)
>  {
>  	int ret;
>  
> -- 
> 2.27.0
> 
-- 
Jan Kara <jack@...e.com>
SUSE Labs, CR