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authorStephen Boyd <sboyd@codeaurora.org>2012-05-24 00:45:21 -0700
committerIngo Molnar <mingo@kernel.org>2012-06-08 11:59:46 +0200
commiteab309494ae2b9e15f85520f00de3893162c2e43 (patch)
treedd0b7ae9b455e9b999665dc8dbcd51679fdade70 /mm
parent8a173b1476d126674104c7c5c6cef0bcd824b001 (diff)
downloadlinux-eab309494ae2b9e15f85520f00de3893162c2e43.tar.bz2
memblock: Document memblock_is_region_{memory,reserved}()
At first glance one would think that memblock_is_region_memory() and memblock_is_region_reserved() would be implemented in the same way. Unfortunately they aren't and the former returns whether the region specified is a subset of a memory bank while the latter returns whether the region specified intersects with reserved memory. Document the two functions so that users aren't tempted to make the implementation the same between them and to clarify the purpose of the functions. Signed-off-by: Stephen Boyd <sboyd@codeaurora.org> Cc: Tejun Heo <tj@kernel.org> Link: http://lkml.kernel.org/r/1337845521-32755-1-git-send-email-sboyd@codeaurora.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'mm')
-rw-r--r--mm/memblock.c20
1 files changed, 20 insertions, 0 deletions
diff --git a/mm/memblock.c b/mm/memblock.c
index 952123eba433..32a0a5e4d79d 100644
--- a/mm/memblock.c
+++ b/mm/memblock.c
@@ -867,6 +867,16 @@ int __init_memblock memblock_is_memory(phys_addr_t addr)
return memblock_search(&memblock.memory, addr) != -1;
}
+/**
+ * memblock_is_region_memory - check if a region is a subset of memory
+ * @base: base of region to check
+ * @size: size of region to check
+ *
+ * Check if the region [@base, @base+@size) is a subset of a memory block.
+ *
+ * RETURNS:
+ * 0 if false, non-zero if true
+ */
int __init_memblock memblock_is_region_memory(phys_addr_t base, phys_addr_t size)
{
int idx = memblock_search(&memblock.memory, base);
@@ -879,6 +889,16 @@ int __init_memblock memblock_is_region_memory(phys_addr_t base, phys_addr_t size
memblock.memory.regions[idx].size) >= end;
}
+/**
+ * memblock_is_region_reserved - check if a region intersects reserved memory
+ * @base: base of region to check
+ * @size: size of region to check
+ *
+ * Check if the region [@base, @base+@size) intersects a reserved memory block.
+ *
+ * RETURNS:
+ * 0 if false, non-zero if true
+ */
int __init_memblock memblock_is_region_reserved(phys_addr_t base, phys_addr_t size)
{
memblock_cap_size(base, &size);