mm/memblock.c: trivial code refine in memblock_is_region_memory()
memblock_is_region_memory() invoke memblock_search() to see whether the
base address is in the memory region. If it fails, idx would be -1.
Then, it returns 0.
If the memblock_search() returns a valid index, it means the base
address is guaranteed to be in the range memblock.memory.regions[idx].
Because of this, it is not necessary to check the base again.
This patch removes the check on "base".
Link: http://lkml.kernel.org/r/1482363033-24754-2-git-send-email-richard.weiyang@gmail.com
Signed-off-by: Wei Yang <richard.weiyang@gmail.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/mm/memblock.c b/mm/memblock.c
index a476d28..90171d5 100644
--- a/mm/memblock.c
+++ b/mm/memblock.c
@@ -1640,8 +1640,7 @@
if (idx == -1)
return 0;
- return memblock.memory.regions[idx].base <= base &&
- (memblock.memory.regions[idx].base +
+ return (memblock.memory.regions[idx].base +
memblock.memory.regions[idx].size) >= end;
}