[PATCH V6 2/4] powerpc/mm: Add support for handling > 512TB address in SLB miss

[Aneesh Kumar K.V]

On 04/09/2018 12:49 PM, Christophe LEROY wrote:
> 
> 
> Le 26/03/2018 à 12:04, Aneesh Kumar K.V a écrit :
>> For addresses above 512TB we allocate additional mmu contexts. To make
>> it all easy, addresses above 512TB are handled with IR/DR=1 and with
>> stack frame setup.
>>
>> The mmu_context_t is also updated to track the new extended_ids. To
>> support upto 4PB we need a total 8 contexts.
>>
>> Signed-off-by: Aneesh Kumar K.V <aneesh.kumar at linux.vnet.ibm.com>
>> [mpe: Minor formatting tweaks and comment wording, switch BUG to WARN
>>        in get_ea_context().]
>> Signed-off-by: Michael Ellerman <mpe at ellerman.id.au>
> 
> Compilation fails on mpc885_ads_defconfig + CONFIG_HUGETLBFS :
> 
>    CC      arch/powerpc/mm/slice.o
> arch/powerpc/mm/slice.c: In function 'slice_get_unmapped_area':
> arch/powerpc/mm/slice.c:655:2: error: implicit declaration of function 
> 'need_extra_context' [-Werror=implicit-function-declaration]
> arch/powerpc/mm/slice.c:656:3: error: implicit declaration of function 
> 'alloc_extended_context' [-Werror=implicit-function-declaration]
> cc1: all warnings being treated as errors
> make[1]: *** [arch/powerpc/mm/slice.o] Error 1
> make: *** [arch/powerpc/mm] Error 2


something like below?

diff --git a/arch/powerpc/mm/slice.c b/arch/powerpc/mm/slice.c
index 9cd87d1..205fe55 100644
--- a/arch/powerpc/mm/slice.c
+++ b/arch/powerpc/mm/slice.c
@@ -35,6 +35,7 @@
  #include <asm/mmu.h>
  #include <asm/copro.h>
  #include <asm/hugetlb.h>
+#include <asm/mmu_context.h>

  static DEFINE_SPINLOCK(slice_convert_lock);


PPC64 was including that header via include/linux/pkeys.h

-aneesh