linux-kernel - [PATCH 1/3] mm: add __nocast attribute to vm

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Date:	Wed, 13 Apr 2011 11:19:48 +0900 (JST)
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
Cc:	kosaki.motohiro@...fujitsu.com,
	Alexey Dobriyan <adobriyan@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>,
	linux-mm <linux-mm@...ck.org>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Hugh Dickins <hughd@...gle.com>,
	Dave Hansen <dave@...ux.vnet.ibm.com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Paul Mundt <lethal@...ux-sh.org>,
	Russell King <linux@....linux.org.uk>
Subject: [PATCH 1/3] mm: add __nocast attribute to vm_flags

> > On Tue, Apr 12, 2011 at 10:12 AM, KOSAKI Motohiro
> > <kosaki.motohiro@...fujitsu.com> wrote:
> > > After next year? All developers don't have to ignore compiler warnings!
> > 
> > At least add vm_flags_t which is sparse-checked, just like we do with gfp_t.
> 
> Good idea.

Alexy, I have to deeply thank you. Your suggestion help to find two
hidden vm_flags usage. (I'll post them as reply of this mail)

Now, i386 allyesconfig build doesn't detect nocast violation. Then, I
believe we don't have a big overlooking anymore.



>From 254787536ac871d313a02db5dfe8c539e0bbf605 Mon Sep 17 00:00:00 2001
From: KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
Date: Wed, 13 Apr 2011 09:26:37 +0900
Subject: [PATCH 1/3] mm: add __nocast attribute to vm_flags

Now, We are converting vm_flags to 64bit. so nocast attribute help to
find hidden wrong vm_flags usage.

Suggested-by: Alexey Dobriyan <adobriyan@...il.com>
Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
---
 include/linux/mm_types.h |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/include/linux/mm_types.h b/include/linux/mm_types.h
index 4b0b990..ca01ab2 100644
--- a/include/linux/mm_types.h
+++ b/include/linux/mm_types.h
@@ -109,7 +109,7 @@ struct page {
  */
 struct vm_region {
 	struct rb_node	vm_rb;		/* link in global region tree */
-	unsigned long long vm_flags;	/* VMA vm_flags */
+	unsigned long long __nocast vm_flags;	/* VMA vm_flags */
 	unsigned long	vm_start;	/* start address of region */
 	unsigned long	vm_end;		/* region initialised to here */
 	unsigned long	vm_top;		/* region allocated to here */
@@ -137,7 +137,7 @@ struct vm_area_struct {
 	struct vm_area_struct *vm_next, *vm_prev;
 
 	pgprot_t vm_page_prot;		/* Access permissions of this VMA. */
-	unsigned long long vm_flags;		/* Flags, see mm.h. */
+	unsigned long long __nocast vm_flags;	/* Flags, see mm.h. */
 
 	struct rb_node vm_rb;
 
-- 
1.7.3.1



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