The total reserved memory in a system is accounted but not available for
use use outside mm/memblock.c. By exposing the total reserved memory,
systems can better calculate the size of large hashes.
Cc: linux-mm@xxxxxxxxx
Cc: Mel Gorman <mgorman@xxxxxxxxxxxxxxxxxxx>
Cc: Vlastimil Babka <vbabka@xxxxxxx>
Cc: Michal Hocko <mhocko@xxxxxxxxxx>
Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Cc: Michael Ellerman <mpe@xxxxxxxxxxxxxx>
Cc: linuxppc-dev@xxxxxxxxxxxxxxxx
Cc: Mahesh Salgaonkar <mahesh@xxxxxxxxxxxxxxxxxx>
Cc: Hari Bathini <hbathini@xxxxxxxxxxxxxxxxxx>
Cc: Dave Hansen <dave.hansen@xxxxxxxxx>
Cc: Balbir Singh <bsingharora@xxxxxxxxx>
Suggested-by: Michael Ellerman <mpe@xxxxxxxxxxxxxx>
Signed-off-by: Srikar Dronamraju <srikar@xxxxxxxxxxxxxxxxxx>
---
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 2925da2..5b759c9 100644
--- a/include/linux/memblock.h
+++ b/include/linux/memblock.h
@@ -328,6 +328,7 @@ phys_addr_t memblock_alloc_base(phys_addr_t size, phys_addr_t align,
phys_addr_t __memblock_alloc_base(phys_addr_t size, phys_addr_t align,
phys_addr_t max_addr);
phys_addr_t memblock_phys_mem_size(void);
+phys_addr_t memblock_reserved_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);
diff --git a/mm/memblock.c b/mm/memblock.c
index 483197e..c8dfa43 100644
--- a/mm/memblock.c
+++ b/mm/memblock.c
@@ -1438,6 +1438,11 @@ phys_addr_t __init_memblock memblock_phys_mem_size(void)
return memblock.memory.total_size;
}
+phys_addr_t __init_memblock memblock_reserved_size(void)
+{
+ return memblock.reserved.total_size;
+}
+
phys_addr_t __init memblock_mem_size(unsigned long limit_pfn)
{
unsigned long pages = 0;
--
1.8.5.6
--
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