linux-kernel - Re: [PATCH] coredump: Replace opencoded set_mask

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Date:	Fri, 7 Aug 2015 13:57:10 +0200
From:	Oleg Nesterov <oleg@...hat.com>
To:	Vineet Gupta <Vineet.Gupta1@...opsys.com>
Cc:	Alexander Viro <viro@...iv.linux.org.uk>,
	"Peter Zijlstra (Intel)" <peterz@...radead.org>,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] coredump: Replace opencoded set_mask_bits()

On 08/07, Vineet Gupta wrote:
>
> --- a/fs/exec.c
> +++ b/fs/exec.c
> @@ -1690,15 +1690,10 @@ EXPORT_SYMBOL(set_binfmt);
>   */
>  void set_dumpable(struct mm_struct *mm, int value)
>  {
> -	unsigned long old, new;
> -
>  	if (WARN_ON((unsigned)value > SUID_DUMP_ROOT))
>  		return;
>  
> -	do {
> -		old = ACCESS_ONCE(mm->flags);
> -		new = (old & ~MMF_DUMPABLE_MASK) | value;
> -	} while (cmpxchg(&mm->flags, old, new) != old);
> +	set_mask_bits(&mm->flags, MMF_DUMPABLE_MASK, value);
>  }

Acked-by: Oleg Nesterov <oleg@...hat.com>

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