linux-kernel - Re: [RFC PATCHv2 1/2] Add mm flag to control THP

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Message-ID: <20140117225250.GA17626@sgi.com>
Date:	Fri, 17 Jan 2014 16:52:50 -0600
From:	Alex Thorlton <athorlton@....com>
To:	Oleg Nesterov <oleg@...hat.com>
Cc:	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Rik van Riel <riel@...hat.com>,
	Naoya Horiguchi <n-horiguchi@...jp.nec.com>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Andy Lutomirski <luto@...capital.net>,
	Al Viro <viro@...iv.linux.org.uk>,
	Kees Cook <keescook@...omium.org>,
	Andrea Arcangeli <aarcange@...hat.com>
Subject: Re: [RFC PATCHv2 1/2] Add mm flag to control THP

On Fri, Jan 17, 2014 at 09:09:23PM +0100, Oleg Nesterov wrote:
> On 01/16, Alex Thorlton wrote:
> >
> > +	case PR_GET_THP_DISABLE:
> > +		error = put_user(test_bit(MMF_THP_DISABLE,
> > +				 &me->mm->flags),
> > +				 (int __user *) arg2);
> > +		break;
> 
> Do we really want put_user?
> 
> 	error = test_bit(MMF_THP_DISABLE);
> 
> can work too and looks simpler (and to me simpler to use in userspace).

That makes sense.  I'll change that; definitely easier to use from
userspace that way.

- Alex
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