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Subject[RFC 3/3] s390/mm: Define arch_get_addressable_range()
Date
This overrides arch_get_addressable_range() on s390 platform and drops
now redudant similar check in vmem_add_mapping().

Cc: Heiko Carstens <hca@linux.ibm.com>
Cc: Vasily Gorbik <gor@linux.ibm.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: linux-s390@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Anshuman Khandual <anshuman.khandual@arm.com>
---
arch/s390/include/asm/mmu.h | 2 ++
arch/s390/mm/vmem.c | 16 ++++++++++++----
2 files changed, 14 insertions(+), 4 deletions(-)

diff --git a/arch/s390/include/asm/mmu.h b/arch/s390/include/asm/mmu.h
index e12ff0f29d1a..f92d3926b188 100644
--- a/arch/s390/include/asm/mmu.h
+++ b/arch/s390/include/asm/mmu.h
@@ -55,4 +55,6 @@ static inline int tprot(unsigned long addr)
return rc;
}

+#define arch_get_addressable_range arch_get_addressable_range
+struct range arch_get_addressable_range(bool need_mapping);
#endif
diff --git a/arch/s390/mm/vmem.c b/arch/s390/mm/vmem.c
index b239f2ba93b0..e03ad0ed13a7 100644
--- a/arch/s390/mm/vmem.c
+++ b/arch/s390/mm/vmem.c
@@ -532,14 +532,22 @@ void vmem_remove_mapping(unsigned long start, unsigned long size)
mutex_unlock(&vmem_mutex);
}

+struct range arch_get_addressable_range(bool need_mapping)
+{
+ struct range memhp_range;
+
+ memhp_range.start = 0;
+ if (need_mapping)
+ memhp_range.end = VMEM_MAX_PHYS;
+ else
+ memhp_range.end = (1ULL << (MAX_PHYSMEM_BITS + 1)) - 1;
+ return memhp_range;
+}
+
int vmem_add_mapping(unsigned long start, unsigned long size)
{
int ret;

- if (start + size > VMEM_MAX_PHYS ||
- start + size < start)
- return -ERANGE;
-
mutex_lock(&vmem_mutex);
ret = vmem_add_range(start, size);
if (ret)
--
2.20.1
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