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

[Gustavo Padovan]

2016-03-17 Gustavo Padovan <gustavo.padovan at collabora.co.uk>:

> 2016-03-17 Joe Perches <joe at perches.com>:
> 
> > On Thu, 2016-03-17 at 14:30 -0300, Gustavo Padovan wrote:
> > > This function had copies in 3 different files. Unify them in
> > > kernel.h.
> > 
> > This is only used by gpu/drm.
> > 
> > I think this is a poor name for a generic function
> > that would be in kernel.h.
> > 
> > Isn't there an include file in linux/drm that's
> > appropriate for this.  Maybe drmP.h
> > 
> > Maybe prefix this function name with drm_ too.
> 
> No, the next patch adds a user to drivers/staging (which will be moved
> to drivers/dma-buf) soon. Maybe move to a different header in
> include/linux/? not sure which one.
> 
> > Also, there's this that might conflict:
> > 
> > arch/powerpc/kernel/signal_32.c:#define to_user_ptr(p)          ptr_to_compat(p)
> > arch/powerpc/kernel/signal_32.c:#define to_user_ptr(p)          ((unsigned long)(p))
> 
> Right, I'll figure out how to replace these two too.

The powerpc to_user_ptr has a different meaning from the one I'm adding
in this patch. I propose we just rename powerpc's to_user_ptr to
__to_user_ptr and leave the rest as is.

	Gustavo