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Date:   Wed, 26 Jun 2019 18:51:00 +0530
From:   Anshuman Khandual <anshuman.khandual@....com>
To:     linux-mm@...ck.org
Cc:     Anshuman Khandual <anshuman.khandual@....com>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        "Aneesh Kumar K.V" <aneesh.kumar@...ux.ibm.com>,
        Nicholas Piggin <npiggin@...il.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Stephen Rothwell <sfr@...b.auug.org.au>,
        linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
        linux-next@...r.kernel.org
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
`.arch_ioremap_p4d_supported'

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

Cc: Benjamin Herrenschmidt <benh@...nel.crashing.org>
Cc: Paul Mackerras <paulus@...ba.org>
Cc: Michael Ellerman <mpe@...erman.id.au>
Cc: "Aneesh Kumar K.V" <aneesh.kumar@...ux.ibm.com>
Cc: Nicholas Piggin <npiggin@...il.com>
Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: Stephen Rothwell <sfr@...b.auug.org.au>
Cc: linuxppc-dev@...ts.ozlabs.org
Cc: linux-kernel@...r.kernel.org
Cc: linux-next@...r.kernel.org

Signed-off-by: Anshuman Khandual <anshuman.khandual@....com>
---
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 */
-- 
2.7.4

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