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Re: [PATCH v9 2/3] kernel.h: add to_user_ptr()

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2016-03-17 Joe Perches <joe@perches.com>:

> On Thu, 2016-03-17 at 18:19 -0300, Gustavo Padovan wrote:
> > 2016-03-17 Joe Perches <joe@perches.com>:
> > > On Thu, 2016-03-17 at 16:50 -0400, Rob Clark wrote:
> > > > On Thu, Mar 17, 2016 at 4:40 PM, Joe Perches <joe@perches.com> wrote:
> > > []
> > > > > It's a name that seems like it should be a straightforward
> > > > > cast of a kernel pointer to a __user pointer like:
> > > > > 
> > > > > static inline void __user *to_user_ptr(void *p)
> > > > > {
> > > > >         return (void __user *)p;
> > > > > }
> > > > ahh, ok.  I guess I was used to using it in the context of ioctl
> > > > structs..  in that context u64 -> (void __user *) made more sense.
> > > > 
> > > > Maybe uapi_to_ptr()?  (ok, not super-creative.. maybe someone has a
> > > > better idea)
> > > Maybe u64_to_user_ptr?
> > That is a good name. If everyone agrees I can resend this patch
> > changing it to u64_to_user_ptr. Then should we still keep it on
> > kernel.h?
> 
> I've no particular opinion about location,
> but maybe compat.h might be appropriate.

I don't think this is really related to compat. I'd keep kernel.h.

The problem I'm trying to solve here is:

CC      drivers/dma-buf/sync_file.o
drivers/dma-buf/sync_file.c: In function ‘sync_file_ioctl_fence_info’:
drivers/dma-buf/sync_file.c:341:19: warning: cast to pointer from
integer of different size [-Wint-to-pointer-cast]
  if (copy_to_user((void __user *)info.sync_fence_info, fence_info,

where info.sync_fence_info is __u64.

	Gustavo

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[PATCH v9 1/3] staging/android: remove redundant comments on sync_merge_data Gustavo Padovan <gustavo@padovan.org> - 2016-03-17 18:40 +0100
  [PATCH v9 2/3] kernel.h: add to_user_ptr() Gustavo Padovan <gustavo@padovan.org> - 2016-03-17 18:40 +0100
    Re: [PATCH v9 2/3] kernel.h: add to_user_ptr() Joe Perches <joe@perches.com> - 2016-03-17 18:50 +0100
      Re: [PATCH v9 2/3] kernel.h: add to_user_ptr() Gustavo Padovan <gustavo.padovan@collabora.co.uk> - 2016-03-17 19:10 +0100
        Re: [PATCH v9 2/3] kernel.h: add to_user_ptr() Gustavo Padovan <gustavo@padovan.org> - 2016-03-17 19:50 +0100
          Re: [PATCH v9 2/3] kernel.h: add to_user_ptr() Joe Perches <joe@perches.com> - 2016-03-17 21:30 +0100
            Re: [PATCH v9 2/3] kernel.h: add to_user_ptr() Rob Clark <robdclark@gmail.com> - 2016-03-17 21:40 +0100
              Re: [PATCH v9 2/3] kernel.h: add to_user_ptr() Joe Perches <joe@perches.com> - 2016-03-17 21:50 +0100
                Re: [PATCH v9 2/3] kernel.h: add to_user_ptr() Rob Clark <robdclark@gmail.com> - 2016-03-17 22:00 +0100
                Re: [PATCH v9 2/3] kernel.h: add to_user_ptr() Joe Perches <joe@perches.com> - 2016-03-17 22:20 +0100
                Re: [PATCH v9 2/3] kernel.h: add to_user_ptr() Gustavo Padovan <gustavo@padovan.org> - 2016-03-17 22:20 +0100
                Re: [PATCH v9 2/3] kernel.h: add to_user_ptr() Rob Clark <robdclark@gmail.com> - 2016-03-17 22:30 +0100
                Re: [PATCH v9 2/3] kernel.h: add to_user_ptr() Joe Perches <joe@perches.com> - 2016-03-17 22:40 +0100
                Re: [PATCH v9 2/3] kernel.h: add to_user_ptr() Gustavo Padovan <gustavo@padovan.org> - 2016-03-17 23:20 +0100
                Re: [PATCH v9 2/3] kernel.h: add to_user_ptr() Daniel Vetter <daniel@ffwll.ch> - 2016-03-18 09:30 +0100
  [PATCH v9 3/3] staging/android: refactor SYNC IOCTLs Gustavo Padovan <gustavo@padovan.org> - 2016-03-17 18:40 +0100

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