[PATCH] staging: zsmalloc: Fix link error on ARM

[Greg Kroah-Hartman]

On Wed, Mar 27, 2013 at 12:03:59AM +0100, Joerg Roedel wrote:
> On Tue, Mar 26, 2013 at 03:45:36PM -0700, Greg Kroah-Hartman wrote:
> > On Tue, Mar 26, 2013 at 11:33:52PM +0100, Joerg Roedel wrote:
> > > Testing the arm chromebook config against the upstream
> > > kernel produces a linker error for the zsmalloc module from
> > > staging. The symbol flush_tlb_kernel_range is not available
> > > there. Fix this by removing the reimplementation of
> > > unmap_kernel_range in the zsmalloc module and using the
> > > function directly.
> > > 
> > > Signed-off-by: Joerg Roedel <joro at 8bytes.org>
> > 
> > Why is this not an error for any other architecture?  Why is arm
> > special?
> 
> The version of the function __zs_unmap_object() which uses
> flush_tlb_kernel_range() in the zsmalloc driver is only compiled in when
> USE_PGTABLE_MAPPING is defined. And USE_PGTABLE_MAPPING is defined in
> the same file only when CONFIG_ARM is defined. So this happens only on
> ARM.

Then should I just mark the driver as broken on ARM?

Any reason for not including the driver authors on the Cc: for this
patch?

greg k-h