[PATCH] xen-netback: remove dead code

[PATCH] xen-netback: remove dead code

[Wei Liu]

The array mmap_pages is never touched in the initialization function. This is
remnant of mapping mechanism, which does exist upstream.

Signed-off-by: Wei Liu <wei.liu2@citrix.com>
---
 drivers/net/xen-netback/netback.c |    4 ----
 1 file changed, 4 deletions(-)

diff --git a/drivers/net/xen-netback/netback.c b/drivers/net/xen-netback/netback.c
index 37984e6..295a9c2 100644
--- a/drivers/net/xen-netback/netback.c
+++ b/drivers/net/xen-netback/netback.c
@@ -1939,10 +1939,6 @@ static int __init netback_init(void)
 failed_init:
 	while (--group >= 0) {
 		struct xen_netbk *netbk = &xen_netbk[group];
-		for (i = 0; i < MAX_PENDING_REQS; i++) {
-			if (netbk->mmap_pages[i])
-				__free_page(netbk->mmap_pages[i]);
-		}
 		del_timer(&netbk->net_timer);
 		kthread_stop(netbk->task);
 	}
-- 
1.7.10.4

Re: [PATCH] xen-netback: remove dead code

[Wei Liu]

On Mon, May 06, 2013 at 04:40:20PM +0100, Wei Liu wrote:
> The array mmap_pages is never touched in the initialization function. This is
> remnant of mapping mechanism, which does exist upstream.
> 

This patch targets net-next.


Thanks
Wei.

Re: [PATCH] xen-netback: remove dead code

[David Miller]

From: Wei Liu <wei.liu2@citrix.com>
Date: Mon, 6 May 2013 17:10:33 +0100

> On Mon, May 06, 2013 at 04:40:20PM +0100, Wei Liu wrote:
>> The array mmap_pages is never touched in the initialization function. This is
>> remnant of mapping mechanism, which does exist upstream.
>> 
> 
> This patch targets net-next.

http://marc.info/?l=linux-netdev&m=136730964130303&w=2

Re: [PATCH] xen-netback: remove dead code

[Wei Liu]

On Mon, May 06, 2013 at 05:17:22PM +0100, David Miller wrote:
> From: Wei Liu <wei.liu2@citrix.com>
> Date: Mon, 6 May 2013 17:10:33 +0100
> 
> > On Mon, May 06, 2013 at 04:40:20PM +0100, Wei Liu wrote:
> >> The array mmap_pages is never touched in the initialization function. This is
> >> remnant of mapping mechanism, which does exist upstream.
> >> 
> > 
> > This patch targets net-next.
> 
> http://marc.info/?l=linux-netdev&m=136730964130303&w=2
> --

Got it.


Wei.

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Re: [PATCH] xen-netback: remove dead code

[Ian Campbell]

On Mon, 2013-05-06 at 16:40 +0100, Wei Liu wrote:
> The array mmap_pages is never touched in the initialization function. This is
> remnant of mapping mechanism, which does exist upstream.
                                         ^not

Can you add a quick note about to the changelog about where this array
is now initialised and freed please, with that:

> Signed-off-by: Wei Liu <wei.liu2@citrix.com>
Acked-by: Ian Campbell <ian.campbell@citrix.com>

Please resubmit when Dave opens net-next for new development.

Ian.

> ---
>  drivers/net/xen-netback/netback.c |    4 ----
>  1 file changed, 4 deletions(-)
> 
> diff --git a/drivers/net/xen-netback/netback.c b/drivers/net/xen-netback/netback.c
> index 37984e6..295a9c2 100644
> --- a/drivers/net/xen-netback/netback.c
> +++ b/drivers/net/xen-netback/netback.c
> @@ -1939,10 +1939,6 @@ static int __init netback_init(void)
>  failed_init:
>  	while (--group >= 0) {
>  		struct xen_netbk *netbk = &xen_netbk[group];
> -		for (i = 0; i < MAX_PENDING_REQS; i++) {
> -			if (netbk->mmap_pages[i])
> -				__free_page(netbk->mmap_pages[i]);
> -		}
>  		del_timer(&netbk->net_timer);
>  		kthread_stop(netbk->task);
>  	}