Re: [PATCH] xen/arm: livepatch: Include xen/mm.h rather than asm/mm.h

[Stefano Stabellini <sstabellini@xxxxxxxxxx>]

On Fri, 15 Jan 2021, Konrad Rzeszutek Wilk wrote:
> On Fri, Jan 15, 2021 at 07:29:47PM +0000, Julien Grall wrote:
> > From: Julien Grall <jgrall@xxxxxxxxxx>
> > 
> > Livepatch fails to build on Arm after commit ced9795c6cb4 "mm: split
> > out mfn_t / gfn_t / pfn_t definitions and helpers":
> > 
> > In file included from livepatch.c:13:0:
> > /oss/xen/xen/include/asm/mm.h:32:28: error: field ‘list’ has incomplete type
> >      struct page_list_entry list;
> >                             ^~~~
> > /oss/xen/xen/include/asm/mm.h:53:43: error: ‘MAX_ORDER’ undeclared here 
> > (not in a function); did you mean ‘PFN_ORDER’?
> >                  unsigned long first_dirty:MAX_ORDER + 1;
> >                                            ^~~~~~~~~
> >                                            PFN_ORDER
> > /oss/xen/xen/include/asm/mm.h:53:31: error: bit-field ‘first_dirty’ width 
> > not an integer constant
> >                  unsigned long first_dirty:MAX_ORDER + 1;
> >                                ^~~~~~~~~~~
> > 
> > This is happening because asm/mm.h is included directly by livepatch.c.
> > Yet it depends on xen/mm.h to be included first so MAX_ORDER is defined.
> > 
> > Resolve the build failure by including xen/mm.h rather than asm/mm.h.
> > 
> > Fixes: ced9795c6cb4 ("mm: split out mfn_t / gfn_t / pfn_t definitions and 
> > helpers")
> Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>

Acked-by: Stefano Stabellini <sstabellini@xxxxxxxxxx>


> Thank you!
> > Signed-off-by: Julien Grall <jgrall@xxxxxxxxxx>
> > ---
> >  xen/arch/arm/livepatch.c | 2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> > 
> > diff --git a/xen/arch/arm/livepatch.c b/xen/arch/arm/livepatch.c
> > index 915e9d926a11..75e8adcfd6a1 100644
> > --- a/xen/arch/arm/livepatch.c
> > +++ b/xen/arch/arm/livepatch.c
> > @@ -6,11 +6,11 @@
> >  #include <xen/lib.h>
> >  #include <xen/livepatch_elf.h>
> >  #include <xen/livepatch.h>
> > +#include <xen/mm.h>
> >  #include <xen/vmap.h>
> >  
> >  #include <asm/cpufeature.h>
> >  #include <asm/livepatch.h>
> > -#include <asm/mm.h>
> >  
> >  /* Override macros from asm/page.h to make them work with mfn_t */
> >  #undef virt_to_mfn
> > -- 
> > 2.17.1
> > 
>