[PATCH] RISC-V: Fixup clear_page export when using Zicboz

[Andrew Jones]

On Fri, Feb 24, 2023 at 02:44:17PM +0000, Sudip Mukherjee wrote:
> 
> 
> On 24/02/2023 1:58 pm, Ben Dooks wrote:
> > When the clear_page() via Zicboz is enabled, the module build
> > fails as clear_page() is not marked as a ksym entry. Fix this
> > by changing the asm code to use <asm-generic/export.h> to add
> > the correct export.
> > 
> > Also remove the weak clear_page() as there's nothing else in
> > the build defining this symbol, so just make it the entry when
> > the Zicboz is enabled.
> > 
> > Fixes modpost errors such as this:
> > ERROR: modpost: "clear_page" [drivers/gpu/drm/ttm/ttm.ko] undefined!
> > 
> > Reported-by: Sudip Mukherjee <sudip.mukherjee at codethink.co.uk>
> > Signed-off-by: Ben Dooks <ben.dooks at codethink.co.uk>
> > ---
> >  arch/riscv/lib/clear_page.S | 6 ++++--
> >  1 file changed, 4 insertions(+), 2 deletions(-)
> > 
> > diff --git a/arch/riscv/lib/clear_page.S b/arch/riscv/lib/clear_page.S
> > index 7c7fa45b5ab5..4ed5fef52d80 100644
> > --- a/arch/riscv/lib/clear_page.S
> > +++ b/arch/riscv/lib/clear_page.S
> > @@ -6,6 +6,7 @@
> >  #include <linux/linkage.h>
> >  #include <asm/asm.h>
> >  #include <asm/alternative-macros.h>
> > +#include <asm-generic/export.h>
> >  #include <asm/hwcap.h>
> >  #include <asm/insn-def.h>
> >  #include <asm/page.h>
> > @@ -17,7 +18,7 @@
> >  
> >  /* void clear_page(void *page) */
> >  ENTRY(__clear_page)
> 
> Shouldn't this be removed also? Am I missing something?

Yes, it should be dropped, I've done so while squashing.

Thanks,
drew