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

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Date:	Mon, 30 Sep 2013 07:45:54 +0200
From:	Ronald <ronald645@...il.com>
To:	"Rafael J. Wysocki" <rjw@...ysocki.net>
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

Yes, works as well. Just survived twe cycles with s2disk. I'm
surprised someone else did not report this earlier btw... Because it
looks pretty generic (i.e. not specific to a 64bit UP system).

Thanks again!

2013/9/30 Rafael J. Wysocki <rjw@...ysocki.net>:
> On Sunday, September 29, 2013 09:22:45 AM Ronald wrote:
>> Attached patch fixes the issue. Both methods function as they did
>> before. Thanks for the superfast fix!
>
> You're welcome, it's not the final one, however.
>
> Can you please test the one below and report back?
>
> Rafael
>
>
> ---
>  kernel/power/snapshot.c |    5 ++++-
>  kernel/power/user.c     |    8 ++++++++
>  2 files changed, 12 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
> @@ -39,6 +39,7 @@ static struct snapshot_data {
>         char frozen;
>         char ready;
>         char platform_support;
> +       bool free_bitmaps;
>  } snapshot_state;
>
>  atomic_t snapshot_device_available = ATOMIC_INIT(1);
> @@ -82,6 +83,10 @@ 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();
> +                       data->free_bitmaps = !error;
> +               }
>                 if (error)
>                         pm_notifier_call_chain(PM_POST_RESTORE);
>         }
> @@ -111,6 +116,8 @@ static int snapshot_release(struct inode
>                 pm_restore_gfp_mask();
>                 free_basic_memory_bitmaps();
>                 thaw_processes();
> +       } else if (data->free_bitmaps) {
> +               free_basic_memory_bitmaps();
>         }
>         pm_notifier_call_chain(data->mode == O_RDONLY ?
>                         PM_POST_HIBERNATION : PM_POST_RESTORE);
> @@ -231,6 +238,7 @@ static long snapshot_ioctl(struct file *
>                         break;
>                 pm_restore_gfp_mask();
>                 free_basic_memory_bitmaps();
> +               data->free_bitmaps = false;
>                 thaw_processes();
>                 data->frozen = 0;
>                 break;
>
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