linux-kernel - Re: samples: kdbus: kdbus-workers: Define dummy prime

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Date:	Sat, 4 Apr 2015 10:26:26 +0200
From:	Greg KH <gregkh@...uxfoundation.org>
To:	Chen Gang <xili_gchen_5257@...mail.com>
Cc:	daniel@...que.org, dh.herrmann@...glemail.com, tixxdz@...ndz.org,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: samples: kdbus: kdbus-workers: Define dummy prime_new()

On Sat, Apr 04, 2015 at 06:17:23AM +0800, Chen Gang wrote:
> Quite a few of architures (e.g. blackfin, cris, frv ...) do not support
> memfd_create system call which is used in prime_new(). So define a dummy
> one.
> 
> The related error (with allmodconfig under blackfin):
> 
>     CC [M]  samples/kfifo/inttype-example.o
>   samples/kdbus/kdbus-workers.c: In function ‘prime_new’:
>   samples/kdbus/kdbus-workers.c:930:18: error: ‘__NR_memfd_create’ undeclared (first use in this function)
>     p->fd = syscall(__NR_memfd_create, "prime-area", MFD_CLOEXEC);
>                     ^
>   samples/kdbus/kdbus-workers.c:930:18: note: each undeclared identifier is reported only once for each function it appears in
>   make[2]: *** [samples/kdbus/kdbus-workers] Error 1
> 
> Signed-off-by: Chen Gang <gang.chen.5i5j@...il.com>
> ---
>  samples/kdbus/kdbus-workers.c | 11 +++++++++++
>  1 file changed, 11 insertions(+)

As Richard said, please hook up these syscalls to those architectures.
Don't you want to use the feature there?  Why hasn't it been added yet?

thanks,

greg k-h
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