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Subject[PATCH 5.2 057/137] powerpc/64s/radix: Fix memory hotplug section page table creation
From: Nicholas Piggin <>

[ Upstream commit 8f51e3929470942e6a8744061254fdeef646cd36 ]

create_physical_mapping expects physical addresses, but creating and
splitting these mappings after boot is supplying virtual (effective)
addresses. This can be irritated by booting with mem= to limit memory
then probing an unused physical memory range:

echo <addr> > /sys/devices/system/memory/probe

This mostly works by accident, firstly because __va(__va(x)) == __va(x)
so the virtual address does not get corrupted. Secondly because pfn_pte
masks out the upper bits of the pfn beyond the physical address limit,
so a pfn constructed with a 0xc000000000000000 virtual linear address
will be masked back to the correct physical address in the pte.

Fixes: 6cc27341b21a8 ("powerpc/mm: add radix__create_section_mapping()")
Signed-off-by: Nicholas Piggin <>
Reviewed-by: Aneesh Kumar K.V <>
Signed-off-by: Michael Ellerman <>
Signed-off-by: Sasha Levin <>
arch/powerpc/mm/book3s64/radix_pgtable.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/powerpc/mm/book3s64/radix_pgtable.c b/arch/powerpc/mm/book3s64/radix_pgtable.c
index 8deb432c29754..2b6cc823046a3 100644
--- a/arch/powerpc/mm/book3s64/radix_pgtable.c
+++ b/arch/powerpc/mm/book3s64/radix_pgtable.c
@@ -901,7 +901,7 @@ int __meminit radix__create_section_mapping(unsigned long start, unsigned long e
return -1;

- return create_physical_mapping(start, end, nid);
+ return create_physical_mapping(__pa(start), __pa(end), nid);

int __meminit radix__remove_section_mapping(unsigned long start, unsigned long end)

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