[PATCH] powerpc/64s/radix: Define arch_ioremap_p4d_supported()

From: Anshuman Khandual
Date: Wed Jun 26 2019 - 09:21:34 EST

Recent core ioremap changes require HAVE_ARCH_HUGE_VMAP subscribing archs
provide arch_ioremap_p4d_supported() failing which will result in a build
failure like the following.

ld: lib/ioremap.o: in function `.ioremap_huge_init':
ioremap.c:(.init.text+0x3c): undefined reference to

This defines a stub implementation for arch_ioremap_p4d_supported() keeping
it disabled for now to fix the build problem.

Cc: Benjamin Herrenschmidt <benh@xxxxxxxxxxxxxxxxxxx>
Cc: Paul Mackerras <paulus@xxxxxxxxx>
Cc: Michael Ellerman <mpe@xxxxxxxxxxxxxx>
Cc: "Aneesh Kumar K.V" <aneesh.kumar@xxxxxxxxxxxxx>
Cc: Nicholas Piggin <npiggin@xxxxxxxxx>
Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Cc: Stephen Rothwell <sfr@xxxxxxxxxxxxxxxx>
Cc: linuxppc-dev@xxxxxxxxxxxxxxxx
Cc: linux-kernel@xxxxxxxxxxxxxxx
Cc: linux-next@xxxxxxxxxxxxxxx

Signed-off-by: Anshuman Khandual <anshuman.khandual@xxxxxxx>
This has been just build tested and fixes the problem reported earlier.

arch/powerpc/mm/book3s64/radix_pgtable.c | 5 +++++
1 file changed, 5 insertions(+)

diff --git a/arch/powerpc/mm/book3s64/radix_pgtable.c b/arch/powerpc/mm/book3s64/radix_pgtable.c
index 8904aa1..c81da88 100644
--- a/arch/powerpc/mm/book3s64/radix_pgtable.c
+++ b/arch/powerpc/mm/book3s64/radix_pgtable.c
@@ -1124,6 +1124,11 @@ void radix__ptep_modify_prot_commit(struct vm_area_struct *vma,
set_pte_at(mm, addr, ptep, pte);

+int __init arch_ioremap_p4d_supported(void)
+ return 0;
int __init arch_ioremap_pud_supported(void)
/* HPT does not cope with large pages in the vmalloc area */