linux-kernel - Re: [PATCH] fs: Convert kmalloc()+memset() combo to kzalloc().

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Message-ID: <4572FD63.4010101@gmail.com>
Date:	Sun, 03 Dec 2006 17:37:32 +0059
From:	Jiri Slaby <jirislaby@...il.com>
To:	"Robert P. J. Day" <rpjday@...dspring.com>
CC:	Linux kernel mailing list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] fs: Convert kmalloc()+memset() combo to kzalloc().

Robert P. J. Day wrote:
>   Convert all obvious combinations of kmalloc()+memset() to single
> kzalloc() in the fs/ directory.
[snip]
> diff --git a/fs/seq_file.c b/fs/seq_file.c
> index 555b9ac..f85feba 100644
> --- a/fs/seq_file.c
> +++ b/fs/seq_file.c
> @@ -31,12 +31,11 @@ int seq_open(struct file *file, struct s
>  	struct seq_file *p = file->private_data;
> 
>  	if (!p) {
> -		p = kmalloc(sizeof(*p), GFP_KERNEL);
> +		p = kzalloc(sizeof(*p), GFP_KERNEL);
>  		if (!p)
>  			return -ENOMEM;
>  		file->private_data = p;
>  	}
> -	memset(p, 0, sizeof(*p));
>  	mutex_init(&p->lock);
>  	p->op = op;

It's not the same! Previous erases it every time seq_open is called and after
your change only once -- when p == NULL.

regards,
-- 
http://www.fi.muni.cz/~xslaby/            Jiri Slaby
faculty of informatics, masaryk university, brno, cz
e-mail: jirislaby gmail com, gpg pubkey fingerprint:
B674 9967 0407 CE62 ACC8  22A0 32CC 55C3 39D4 7A7E
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