netdev - Re: [PATCH v3] net: Allow no-cache copy from user on transmit

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Date:	Mon, 4 Apr 2011 08:10:08 -0700
From:	Tom Herbert <therbert@...gle.com>
To:	David Miller <davem@...emloft.net>
Cc:	netdev@...r.kernel.org
Subject: Re: [PATCH v3] net: Allow no-cache copy from user on transmit

> Actually, I'm sorry, I have to kick this back to you again Tom.
>
I don't think I see the problem.  Does this still fail sparc compilation?

> The original problem is that "linux/uaccess.h" has not been included
> in the spot where you try to invoke the nocache copies.
>
So I added include of linux/uaccess.h to net/sock.h.

> linux/uaccess.h, when ARCH_HAS_NOCACHE_UACCESS is defined, provides
> dummy routines.
>
I assume you mean "is not defined"?

> So it's not correct to use ARCH_HAS_NOCACHE_UACCESS to conditionalize
> things in the networking, just make sure linux/uaccess.h is included
> at the call sites.
>
Why isn't this correct?  Shouldn't it be okay if linux/uaccess.h
(asm/uaccess.h) is always included where  ARCH_HAS_NOCACHE_UACCESS is
used?
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