linux-kernel - Re: mm snapshot broken-out-2007-03-18-02-44.tar.gz uploaded

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Date:	Mon, 19 Mar 2007 19:02:26 +0100
From:	Michal Piotrowski <michal.k.k.piotrowski@...il.com>
To:	Michal Piotrowski <michal.k.k.piotrowski@...il.com>
CC:	Pekka J Enberg <penberg@...helsinki.fi>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: mm snapshot broken-out-2007-03-18-02-44.tar.gz uploaded

Michal Piotrowski napisał(a):
> On 19/03/07, Michal Piotrowski <michal.k.k.piotrowski@...il.com> wrote:
>> On 19/03/07, Pekka J Enberg <penberg@...helsinki.fi> wrote:
>> > On Mon, 19 Mar 2007, Michal Piotrowski wrote:
>> > > Yes, revoke-special-mmap-handling.patch is bad.
>> >
>> > Aah, the VM_REVOKED flag stomps on VM_CAN_INVALIDATE in -mm. Changing
>> > VM_REVOKED to 0x10000000 should fix it.
> 
> Unfortunately it doesn't. 0x10000000 is used by VM_CAN_NONLINEAR.
> 0x20000000 should be a better value.

Here is a tested patch.

Regards,
Michal

-- 
Michal K. K. Piotrowski
LTG - Linux Testers Group (PL)
(http://www.stardust.webpages.pl/ltg/)
LTG - Linux Testers Group (EN)
(http://www.stardust.webpages.pl/linux_testers_group_en/)

Signed-off-by: Michal Piotrowski <michal.k.k.piotrowski@...il.com>
Signed-off-by: Pekka J Enberg <penberg@...helsinki.fi>

--- linux-work1-clean/include/linux/mm.h	2007-03-19 18:52:28.000000000 +0100
+++ linux-work1/include/linux/mm.h	2007-03-19 18:23:04.000000000 +0100
@@ -173,7 +173,6 @@ extern int do_mprotect(unsigned long sta
 #define VM_MAPPED_COPY	0x01000000	/* T if mapped copy of data (nommu mmap) */
 #define VM_INSERTPAGE	0x02000000	/* The vma has had "vm_insert_page()" done on it */
 #define VM_ALWAYSDUMP	0x04000000	/* Always include in core dumps */
-#define VM_REVOKED	0x08000000	/* Mapping has been revoked */
 
 #define VM_CAN_INVALIDATE 0x08000000	/* The mapping may be invalidated,
 					 * eg. truncate or invalidate_inode_*.
@@ -181,6 +180,7 @@ extern int do_mprotect(unsigned long sta
 					 * return with the page locked.
 					 */
 #define VM_CAN_NONLINEAR 0x10000000	/* Has ->fault & does nonlinear pages */
+#define VM_REVOKED	0x20000000	/* Mapping has been revoked */
 
 #ifndef VM_STACK_DEFAULT_FLAGS		/* arch can override this */
 #define VM_STACK_DEFAULT_FLAGS VM_DATA_DEFAULT_FLAGS
-
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