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Date:   Wed, 26 Jun 2019 18:51:00 +0530
From:   Anshuman Khandual <>
Cc:     Anshuman Khandual <>,
        Benjamin Herrenschmidt <>,
        Paul Mackerras <>,
        Michael Ellerman <>,
        "Aneesh Kumar K.V" <>,
        Nicholas Piggin <>,
        Andrew Morton <>,
        Stephen Rothwell <>,,,
Subject: [PATCH] powerpc/64s/radix: Define arch_ioremap_p4d_supported()

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 <>
Cc: Paul Mackerras <>
Cc: Michael Ellerman <>
Cc: "Aneesh Kumar K.V" <>
Cc: Nicholas Piggin <>
Cc: Andrew Morton <>
Cc: Stephen Rothwell <>

Signed-off-by: Anshuman Khandual <>
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 */

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