linux-kernel - Re: [PATCH 6/6] proc: use IS_ERR_OR

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Date:	Wed, 11 Apr 2012 17:41:13 -0700 (PDT)
From:	Hugh Dickins <hughd@...gle.com>
To:	Cong Wang <xiyou.wangcong@...il.com>
cc:	linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Oleg Nesterov <oleg@...hat.com>,
	Alexey Dobriyan <adobriyan@...il.com>,
	Al Viro <viro@...iv.linux.org.uk>,
	Vasiliy Kulikov <segoon@...nwall.com>,
	David Rientjes <rientjes@...gle.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Naoya Horiguchi <n-horiguchi@...jp.nec.com>,
	Siddhesh Poyarekar <siddhesh.poyarekar@...il.com>
Subject: Re: [PATCH 6/6] proc: use IS_ERR_OR_NULL()

On Wed, 11 Apr 2012, Cong Wang wrote:

> Cc: Oleg Nesterov <oleg@...hat.com>
> Cc: Alexey Dobriyan <adobriyan@...il.com>
> Signed-off-by: Cong Wang <xiyou.wangcong@...il.com>

Whereas this one, I don't object, but I don't see it as an improvement.

> ---
>  fs/proc/base.c       |    2 +-
>  fs/proc/task_mmu.c   |    4 ++--
>  fs/proc/task_nommu.c |    2 +-
>  3 files changed, 4 insertions(+), 4 deletions(-)
> 
> diff --git a/fs/proc/base.c b/fs/proc/base.c
> index 2dff86b..a72a409 100644
> --- a/fs/proc/base.c
> +++ b/fs/proc/base.c
> @@ -239,7 +239,7 @@ static int proc_pid_auxv(struct task_struct *task, char *buffer)
>  {
>  	struct mm_struct *mm = mm_access(task, PTRACE_MODE_READ);
>  	int res = PTR_ERR(mm);
> -	if (mm && !IS_ERR(mm)) {
> +	if (!IS_ERR_OR_NULL(mm)) {
>  		unsigned int nwords = 0;
>  		do {
>  			nwords += 2;
> diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c
> index 03360a1..da4cf5f 100644
> --- a/fs/proc/task_mmu.c
> +++ b/fs/proc/task_mmu.c
> @@ -126,7 +126,7 @@ static void *m_start(struct seq_file *m, loff_t *pos)
>  		return ERR_PTR(-ESRCH);
>  
>  	mm = mm_access(priv->task, PTRACE_MODE_READ);
> -	if (!mm || IS_ERR(mm))
> +	if (IS_ERR_OR_NULL(mm))
>  		return mm;
>  	down_read(&mm->mmap_sem);
>  
> @@ -916,7 +916,7 @@ static ssize_t pagemap_read(struct file *file, char __user *buf,
>  
>  	mm = mm_access(task, PTRACE_MODE_READ);
>  	ret = PTR_ERR(mm);
> -	if (!mm || IS_ERR(mm))
> +	if (IS_ERR_OR_NULL(mm))
>  		goto out_free;
>  
>  	pagemap_walk.pmd_entry = pagemap_pte_range;
> diff --git a/fs/proc/task_nommu.c b/fs/proc/task_nommu.c
> index 1ccfa53..57ad3cf 100644
> --- a/fs/proc/task_nommu.c
> +++ b/fs/proc/task_nommu.c
> @@ -224,7 +224,7 @@ static void *m_start(struct seq_file *m, loff_t *pos)
>  		return ERR_PTR(-ESRCH);
>  
>  	mm = mm_access(priv->task, PTRACE_MODE_READ);
> -	if (!mm || IS_ERR(mm)) {
> +	if (IS_ERR_OR_NULL(mm)) {
>  		put_task_struct(priv->task);
>  		priv->task = NULL;
>  		return mm;
> -- 
> 1.7.7.6
> 
> 
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