[PATCH v1] mm/memblock: Add memblock_first_region_size() helper

[Alexander Kuleshov <kuleshovmail@gmail.com>]

Some architectures (like s390, microblaze and etc...) require size
of the first memory region. This patch provides new memblock_first_region_size()
helper for this case.

Signed-off-by: Alexander Kuleshov <kuleshovmail@gmail.com>
---
 include/linux/memblock.h | 1 +
 mm/memblock.c            | 5 +++++
 2 files changed, 6 insertions(+)

diff --git a/include/linux/memblock.h b/include/linux/memblock.h
index cc4b019..8a481e5 100644
--- a/include/linux/memblock.h
+++ b/include/linux/memblock.h
@@ -319,6 +319,7 @@ phys_addr_t memblock_phys_mem_size(void);
 phys_addr_t memblock_mem_size(unsigned long limit_pfn);
 phys_addr_t memblock_start_of_DRAM(void);
 phys_addr_t memblock_end_of_DRAM(void);
+phys_addr_t memblock_first_region_size(void);
 void memblock_enforce_memory_limit(phys_addr_t memory_limit);
 int memblock_is_memory(phys_addr_t addr);
 int memblock_is_region_memory(phys_addr_t base, phys_addr_t size);
diff --git a/mm/memblock.c b/mm/memblock.c
index 87108e7..fb4b7ca 100644
--- a/mm/memblock.c
+++ b/mm/memblock.c
@@ -1463,6 +1463,11 @@ phys_addr_t __init_memblock memblock_end_of_DRAM(void)
 	return (memblock.memory.regions[idx].base + memblock.memory.regions[idx].size);
 }
 
+phys_addr_t __init_memblock memblock_first_region_size(void)
+{
+	return memblock.memory.regions[0].size;
+}
+
 void __init memblock_enforce_memory_limit(phys_addr_t limit)
 {
 	phys_addr_t max_addr = (phys_addr_t)ULLONG_MAX;
-- 
2.5.0

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