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Message-ID: <20160421133612.GB2392@joana>
Date: Thu, 21 Apr 2016 10:36:12 -0300
From: Gustavo Padovan <gustavo@...ovan.org>
To: Joe Perches <joe@...ches.com>
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
linux-kernel@...r.kernel.org, devel@...verdev.osuosl.org,
dri-devel@...ts.freedesktop.org,
Daniel Stone <daniels@...labora.com>,
Arve Hjønnevåg <arve@...roid.com>,
Riley Andrews <riandrews@...roid.com>,
Daniel Vetter <daniel.vetter@...ll.ch>,
Rob Clark <robdclark@...il.com>,
Greg Hackmann <ghackmann@...gle.com>,
John Harrison <John.C.Harrison@...el.com>,
Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
Gustavo Padovan <gustavo.padovan@...labora.co.uk>,
Andrew Morton <akpm@...ux-foundation.org>,
David Airlie <airlied@...ux.ie>,
Daniel Vetter <daniel.vetter@...el.com>
Subject: Re: [PATCH 2/3] kernel.h: add u64_to_user_ptr()
2016-04-20 Joe Perches <joe@...ches.com>:
> On Wed, 2016-04-20 at 16:18 -0300, Gustavo Padovan wrote:
> > From: Gustavo Padovan <gustavo.padovan@...labora.co.uk>
> >
> > This function had copies in 3 different files. Unify them in kernel.h.
> []
> > diff --git a/include/linux/kernel.h b/include/linux/kernel.h
> []
> > @@ -53,6 +53,12 @@
> >
> > #define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]) + __must_be_array(arr))
> >
> > +static inline void __user *u64_to_user_ptr(u64 address)
> > +{
> > + typecheck(u64, address);
> > + return (void __user *)(uintptr_t)address;
> > +}
> > +
>
> This won't work because by the time address is checked
> address is already u64
>
> This would need to be something like
>
> #define u64_to_user_ptr(x) \
> ({ \
> typecheck(u64, x); \
> u64_to_user_ptr(x); \
> })
Indeed, thanks for noting and for the suggestion.
Gustavo
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