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From: David Laight <David.Laight@ACULAB.COM>
To: 'Alexey Dobriyan' <adobriyan@gmail.com>,
	"akpm@linux-foundation.org" <akpm@linux-foundation.org>
Cc: "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: RE: [PATCH 06/13] proc: convert /proc/self to _print_integer()
Date: Wed, 29 Aug 2018 09:50:50 +0000
Message-ID: <54cb86c6d96b47bc8017a69be124c105@AcuMS.aculab.com> (raw)
In-Reply-To: <20180827231503.26899-6-adobriyan@gmail.com>

From: Alexey Dobriyan
> Sent: 28 August 2018 00:15
> ---
>  fs/proc/self.c | 7 ++++++-
>  1 file changed, 6 insertions(+), 1 deletion(-)
> 
> diff --git a/fs/proc/self.c b/fs/proc/self.c
> index 127265e5c55f..b2279412237b 100644
> --- a/fs/proc/self.c
> +++ b/fs/proc/self.c
> @@ -14,6 +14,7 @@ static const char *proc_self_get_link(struct dentry *dentry,
>  {
>  	struct pid_namespace *ns = proc_pid_ns(inode);
>  	pid_t tgid = task_tgid_nr_ns(current, ns);
> +	char buf[10], *p = buf + sizeof(buf);
>  	char *name;
> 
>  	if (!tgid)
> @@ -22,7 +23,11 @@ static const char *proc_self_get_link(struct dentry *dentry,
>  	name = kmalloc(10 + 1, dentry ? GFP_KERNEL : GFP_ATOMIC);
>  	if (unlikely(!name))
>  		return dentry ? ERR_PTR(-ENOMEM) : ERR_PTR(-ECHILD);
> -	sprintf(name, "%u", tgid);
> +

Best not to 'hide' the initialisation of 'p' at the top of the function.
Much easier to see what is going on if it is moved here.

> +	p = _print_integer_u32(p, tgid);

or just:
	p = _print_integer(buf + sizeof(buf), tgid);

(What a horrid interface ...)

> +	memcpy(name, p, buf + sizeof(buf) - p);
> +	name[buf + sizeof(buf) - p] = '\0';
> +
>  	set_delayed_call(done, kfree_link, name);
>  	return name;
>  }
> --
> 2.16.4

-
Registered Address Lakeside, Bramley Road, Mount Farm, Milton Keynes, MK1 1PT, UK
Registration No: 1397386 (Wales)


  reply index

Thread overview: 24+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-08-27 23:14 [PATCH 01/13] seq_file: rewrite seq_puts() in terms of seq_write() Alexey Dobriyan
2018-08-27 23:14 ` [PATCH 02/13] proc: apply seq_puts() whenever possible Alexey Dobriyan
2018-08-27 23:14 ` [PATCH 03/13] proc: rename "p" variable in proc_readfd_common() Alexey Dobriyan
2018-08-27 23:14 ` [PATCH 04/13] proc: rename "p" variable in proc_map_files_readdir() Alexey Dobriyan
2018-08-27 23:14 ` [PATCH 05/13] proc: new and improved way to print decimals Alexey Dobriyan
2018-08-27 23:14 ` [PATCH 06/13] proc: convert /proc/self to _print_integer() Alexey Dobriyan
2018-08-29  9:50   ` David Laight [this message]
2018-08-30 13:13     ` Alexey Dobriyan
2018-08-27 23:14 ` [PATCH 07/13] proc: convert /proc/thread-self " Alexey Dobriyan
2018-08-27 23:14 ` [PATCH 08/13] proc: convert /proc/*/fd " Alexey Dobriyan
2018-08-27 23:14 ` [PATCH 09/13] proc: convert dentry flushing on exit " Alexey Dobriyan
2018-08-27 23:15 ` [PATCH 10/13] proc: convert readdir /proc " Alexey Dobriyan
2018-08-27 23:15 ` [PATCH 11/13] proc: readdir /proc/*/task Alexey Dobriyan
2018-08-28 12:36   ` Ahmed S. Darwish
2018-08-28 13:04     ` Ahmed S. Darwish
2018-08-28 19:35       ` Alexey Dobriyan
2018-08-29 23:43         ` Andrew Morton
2018-08-30 13:20           ` Alexey Dobriyan
2018-08-28 19:31     ` Alexey Dobriyan
2018-08-27 23:15 ` [PATCH 12/13] proc: convert /proc/*/statm to _print_integer() Alexey Dobriyan
2018-08-27 23:15 ` [PATCH 13/13] proc: convert /proc/*/task/*/children " Alexey Dobriyan
2018-08-28 18:24 ` [PATCH 01/13] seq_file: rewrite seq_puts() in terms of seq_write() Joe Perches
2018-08-28 20:48   ` Joe Perches
2018-09-03 14:17 ` Alexey Dobriyan

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