linux-kernel - Re: [PATCH] staging: android: ashmem: Add support for 32bit ashmem calls in a 64bit kernel

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Message-ID: <5135CB38.1030201@arm.com>
Date:	Tue, 05 Mar 2013 10:38:48 +0000
From:	Serban Constantinescu <Serban.Constantinescu@....com>
To:	Greg KH <gregkh@...uxfoundation.org>
CC:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"kernel-team@...roid.com" <kernel-team@...roid.com>,
	"arve@...roid.com" <arve@...roid.com>,
	"john.stultz@...aro.org" <john.stultz@...aro.org>,
	Dave Butcher <Dave.Butcher@....com>
Subject: Re: [PATCH] staging: android: ashmem: Add support for 32bit ashmem
 calls in a 64bit kernel

On 05/03/13 10:27, Greg KH wrote:
> On Tue, Mar 05, 2013 at 10:18:27AM +0000, Serban Constantinescu wrote:
>> Android's shared memory subsystem, Ashmem, does not support calls from a
>> 32bit userspace in a 64 bit kernel. This patch adds support for syscalls
>> coming from a 32bit userspace in a 64bit kernel.
>>
>> The patch has been successfully tested on ARMv8 AEM(64bit
>> platform model) and Versatile Express A9(32bit platform).
>>
>> Signed-off-by: Serban Constantinescu <serban.constantinescu@....com>
>> ---
>>   drivers/staging/android/ashmem.c |   22 +++++++++++++++++++++-
>>   drivers/staging/android/ashmem.h |    6 ++++++
>>   2 files changed, 27 insertions(+), 1 deletion(-)
>
> Ok, what has changed from your previous version that I rejected that is
> going to actually allow this to build?

I had to add <linux/compat.h> for a successful build on x86_64. The 
attached hunk is the only change added.

> diff --git a/drivers/staging/android/ashmem.c b/drivers/staging/android/ashmem.c
> index 72064fc..e96f381 100644
> --- a/drivers/staging/android/ashmem.c
> +++ b/drivers/staging/android/ashmem.c
> @@ -31,6 +31,7 @@
>  #include <linux/bitops.h>
>  #include <linux/mutex.h>
>  #include <linux/shmem_fs.h>
> +#include <linux/compat.h>
>  #include "ashmem.h"
>
>  #define ASHMEM_NAME_PREFIX "dev/ashmem/"


>
> Hint, you gotta tell me what version of the patch this is, and what
> changed, otherwise I'll just assume this is a resend of the previous
> patch and go ahead and delete it from my queue.

Sorry - same patch as before, the one that had John and Arve's ack, plus 
the above hunk.
>
> In fact, I might as well do that, now deleted :)
>
> greg k-h
>

Thanks,
Serban

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