linux-kernel - Re: [PATCH 07/17] mm: madvise MADV_USERFAULT: prepare vm

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Message-ID: <20141007090307.GA30762@node.dhcp.inet.fi>
Date:	Tue, 7 Oct 2014 12:03:07 +0300
From:	"Kirill A. Shutemov" <kirill@...temov.name>
To:	Andrea Arcangeli <aarcange@...hat.com>
Cc:	qemu-devel@...gnu.org, kvm@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	linux-api@...r.kernel.org,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andres Lagar-Cavilla <andreslc@...gle.com>,
	Dave Hansen <dave@...1.net>,
	Paolo Bonzini <pbonzini@...hat.com>,
	Rik van Riel <riel@...hat.com>, Mel Gorman <mgorman@...e.de>,
	Andy Lutomirski <luto@...capital.net>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Sasha Levin <sasha.levin@...cle.com>,
	Hugh Dickins <hughd@...gle.com>,
	Peter Feiner <pfeiner@...gle.com>,
	"\\\"Dr. David Alan Gilbert\\\"" <dgilbert@...hat.com>,
	Christopher Covington <cov@...eaurora.org>,
	Johannes Weiner <hannes@...xchg.org>,
	Android Kernel Team <kernel-team@...roid.com>,
	Robert Love <rlove@...gle.com>,
	Dmitry Adamushko <dmitry.adamushko@...il.com>,
	Neil Brown <neilb@...e.de>, Mike Hommey <mh@...ndium.org>,
	Taras Glek <tglek@...illa.com>, Jan Kara <jack@...e.cz>,
	KOSAKI Motohiro <kosaki.motohiro@...il.com>,
	Michel Lespinasse <walken@...gle.com>,
	Minchan Kim <minchan@...nel.org>,
	Keith Packard <keithp@...thp.com>,
	"Huangpeng (Peter)" <peter.huangpeng@...wei.com>,
	Isaku Yamahata <yamahata@...inux.co.jp>,
	Anthony Liguori <anthony@...emonkey.ws>,
	Stefan Hajnoczi <stefanha@...il.com>,
	Wenchao Xia <wenchaoqemu@...il.com>,
	Andrew Jones <drjones@...hat.com>,
	Juan Quintela <quintela@...hat.com>
Subject: Re: [PATCH 07/17] mm: madvise MADV_USERFAULT: prepare vm_flags to
 allow more than 32bits

On Fri, Oct 03, 2014 at 07:07:57PM +0200, Andrea Arcangeli wrote:
> We run out of 32bits in vm_flags, noop change for 64bit archs.
> 
> Signed-off-by: Andrea Arcangeli <aarcange@...hat.com>
> ---
>  fs/proc/task_mmu.c       | 4 ++--
>  include/linux/huge_mm.h  | 4 ++--
>  include/linux/ksm.h      | 4 ++--
>  include/linux/mm_types.h | 2 +-
>  mm/huge_memory.c         | 2 +-
>  mm/ksm.c                 | 2 +-
>  mm/madvise.c             | 2 +-
>  mm/mremap.c              | 2 +-
>  8 files changed, 11 insertions(+), 11 deletions(-)
> 
> diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c
> index c341568..ee1c3a2 100644
> --- a/fs/proc/task_mmu.c
> +++ b/fs/proc/task_mmu.c
> @@ -532,11 +532,11 @@ static void show_smap_vma_flags(struct seq_file *m, struct vm_area_struct *vma)
>  	/*
>  	 * Don't forget to update Documentation/ on changes.
>  	 */
> -	static const char mnemonics[BITS_PER_LONG][2] = {
> +	static const char mnemonics[BITS_PER_LONG+1][2] = {

I believe here and below should be BITS_PER_LONG_LONG instead: it will
catch unknown vmflags. And +1 is not needed un 64-bit systems.

>  		/*
>  		 * In case if we meet a flag we don't know about.
>  		 */
> -		[0 ... (BITS_PER_LONG-1)] = "??",
> +		[0 ... (BITS_PER_LONG)] = "??",
>  
>  		[ilog2(VM_READ)]	= "rd",
>  		[ilog2(VM_WRITE)]	= "wr",
-- 
 Kirill A. Shutemov
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