linux-kernel - Re: Fwd: [v3.12-rc1] [regression] PM / hibernate: Create memory bitmaps after freezing user space

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Message-ID: <6939844.AIXnPB8Wdj@vostro.rjw.lan>
Date:	Sun, 29 Sep 2013 03:16:40 +0200
From:	"Rafael J. Wysocki" <rjw@...ysocki.net>
To:	Ronald <ronald645@...il.com>
Cc:	linux-kernel@...r.kernel.org,
	Linux PM list <linux-pm@...r.kernel.org>
Subject: Re: Fwd: [v3.12-rc1] [regression] PM / hibernate: Create memory bitmaps after freezing user space

On Saturday, September 28, 2013 08:18:18 PM Ronald wrote:
> [ resend, forgot to disable HTML (sorry!) ]
> 
> Dear kernel developers,
> 
> Commit 8fd37a4c9 (PM / hibernate: Create memory bitmaps after freezing
> user space) causes resume to fail.
> 
> Only, when using the s2disk utility (through pm-hibernate).
> 
> Not when I do:
> 
> echo -n "disk" > /sys/power/state
> 
> Reverting the commit did not work.
> 
> I am using a encrypted LUKS partition with a temporary key that is
> functioning as the swap device used for the suspend image.
> 
> Awaiting further orders....

I'm traveling now, so I can't really test things, but I think I know what the
problem is.

Can you please check if the appended patch makes any difference for you?

Rafael


---
 kernel/power/snapshot.c |    5 ++++-
 kernel/power/user.c     |    5 +++++
 2 files changed, 9 insertions(+), 1 deletion(-)

Index: linux-pm/kernel/power/snapshot.c
===================================================================
--- linux-pm.orig/kernel/power/snapshot.c
+++ linux-pm/kernel/power/snapshot.c
@@ -743,7 +743,10 @@ int create_basic_memory_bitmaps(void)
 	struct memory_bitmap *bm1, *bm2;
 	int error = 0;
 
-	BUG_ON(forbidden_pages_map || free_pages_map);
+	if (forbidden_pages_map && free_pages_map)
+		return 0;
+	else
+		BUG_ON(forbidden_pages_map || free_pages_map);
 
 	bm1 = kzalloc(sizeof(struct memory_bitmap), GFP_KERNEL);
 	if (!bm1)
Index: linux-pm/kernel/power/user.c
===================================================================
--- linux-pm.orig/kernel/power/user.c
+++ linux-pm/kernel/power/user.c
@@ -82,6 +82,9 @@ static int snapshot_open(struct inode *i
 		data->swap = -1;
 		data->mode = O_WRONLY;
 		error = pm_notifier_call_chain(PM_RESTORE_PREPARE);
+		if (!error)
+			error = create_basic_memory_bitmaps();
+
 		if (error)
 			pm_notifier_call_chain(PM_POST_RESTORE);
 	}

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