[PATCH 04/11] memblock: Introduce memblock_set_current_limit_low() to set lower limit of memblock.

[Tang Chen]

Corresponding to memblock_set_current_limit_high(), we introduce memblock_set_current_limit_low()
to set the lowest limit for memblock.

Signed-off-by: Tang Chen <tangchen@xxxxxxxxxxxxxx>
Reviewed-by: Zhang Yanfei <zhangyanfei@xxxxxxxxxxxxxx>
---
 include/linux/memblock.h |    9 ++++++++-
 mm/memblock.c            |    5 +++++
 2 files changed, 13 insertions(+), 1 deletions(-)

diff --git a/include/linux/memblock.h b/include/linux/memblock.h
index 40eb18e..cabd685 100644
--- a/include/linux/memblock.h
+++ b/include/linux/memblock.h
@@ -174,6 +174,14 @@ static inline void memblock_dump_all(void)
 }
 
 /**
+ * memblock_set_current_limit_low - Set the current allocation lower limit to
+ *                         allow limiting allocations to what is currently
+ *                         accessible during boot
+ * @limit: New lower limit value (physical address)
+ */
+void memblock_set_current_limit_low(phys_addr_t limit);
+
+/**
  * memblock_set_current_limit_high - Set the current allocation upper limit to
  *                         allow limiting allocations to what is currently
  *                         accessible during boot
@@ -181,7 +189,6 @@ static inline void memblock_dump_all(void)
  */
 void memblock_set_current_limit_high(phys_addr_t limit);
 
-
 /*
  * pfn conversion functions
  *
diff --git a/mm/memblock.c b/mm/memblock.c
index 0dd5387..54c1c2e 100644
--- a/mm/memblock.c
+++ b/mm/memblock.c
@@ -989,6 +989,11 @@ void __init_memblock memblock_trim_memory(phys_addr_t align)
 	}
 }
 
+void __init_memblock memblock_set_current_limit_low(phys_addr_t limit)
+{
+	memblock.current_limit_low = limit;
+}
+
 void __init_memblock memblock_set_current_limit_high(phys_addr_t limit)
 {
 	memblock.current_limit_high = limit;
-- 
1.7.1

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