linux-kernel - Re: [PATCH V2 1/2] Drivers: hv: balloon: Fix a bug in the hot-add code

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Date:	Mon, 15 Jul 2013 13:05:08 +0800
From:	Jason Wang <jasowang@...hat.com>
To:	"K. Y. Srinivasan" <kys@...rosoft.com>
CC:	gregkh@...uxfoundation.org, linux-kernel@...r.kernel.org,
	devel@...uxdriverproject.org, olaf@...fle.de, apw@...onical.com,
	Stable <stable@...r.kernel.org>
Subject: Re: [PATCH V2 1/2] Drivers: hv: balloon: Fix a bug in the hot-add
 code

On 07/15/2013 01:38 PM, K. Y. Srinivasan wrote:
> As we hot-add 128 MB chunks of memory, we wait to ensure that the memory
> is onlined before attempting to hot-add the next chunk. If the udev rule for
> memory hot-add is not executed within the allowed time, we would rollback the
> state and abort further hot-add. Since the hot-add has succeeded and the only
> failure is that the memory is not onlined within the allowed time, we should not
> be rolling back the state. Fix this bug.
>
> Signed-off-by: K. Y. Srinivasan <kys@...rosoft.com>
> Cc: Stable <stable@...r.kernel.org>
> ---
>  drivers/hv/hv_balloon.c |   13 +++++--------
>  1 files changed, 5 insertions(+), 8 deletions(-)
>
> diff --git a/drivers/hv/hv_balloon.c b/drivers/hv/hv_balloon.c
> index 4c605c7..61b7351 100644
> --- a/drivers/hv/hv_balloon.c
> +++ b/drivers/hv/hv_balloon.c
> @@ -562,7 +562,7 @@ static void hv_mem_hot_add(unsigned long start, unsigned long size,
>  				struct hv_hotadd_state *has)
>  {
>  	int ret = 0;
> -	int i, nid, t;
> +	int i, nid;
>  	unsigned long start_pfn;
>  	unsigned long processed_pfn;
>  	unsigned long total_pfn = pfn_count;
> @@ -607,14 +607,11 @@ static void hv_mem_hot_add(unsigned long start, unsigned long size,
>  
>  		/*
>  		 * Wait for the memory block to be onlined.
> +		 * Since the hot add has succeeded, it is ok to
> +		 * proceed even if the pages in the hot added region
> +		 * have not been "onlined" within the allowed time.
>  		 */
> -		t = wait_for_completion_timeout(&dm_device.ol_waitevent, 5*HZ);
> -		if (t == 0) {
> -			pr_info("hot_add memory timedout\n");
> -			has->ha_end_pfn -= HA_CHUNK;
> -			has->covered_end_pfn -=  processed_pfn;
> -			break;
> -		}
> +		wait_for_completion_timeout(&dm_device.ol_waitevent, 5*HZ);
>  
>  	}
>  

Acked-by: Jason Wang <jasowang@...hat.com>

Thanks
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