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| author | Wei Yang <richard.weiyang@gmail.com> | 2017-02-22 15:45:04 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2017-02-22 16:41:29 -0800 |
| commit | ef415ef41153b747031e8ad965cb3df4f22ff72e (patch) | |
| tree | f1fe360440def0dff05ae3e60a101c11b4d56d41 /mm/memblock.c | |
| parent | 399d8eebe768fe3ae648700547d04f2a8796a4da (diff) | |
| download | linux-stable-ef415ef41153b747031e8ad965cb3df4f22ff72e.tar.gz linux-stable-ef415ef41153b747031e8ad965cb3df4f22ff72e.tar.bz2 linux-stable-ef415ef41153b747031e8ad965cb3df4f22ff72e.zip | |
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>
Diffstat (limited to 'mm/memblock.c')
| -rw-r--r-- | mm/memblock.c | 3 |
1 files changed, 1 insertions, 2 deletions
diff --git a/mm/memblock.c b/mm/memblock.c index a476d28e0733..90171d508b09 100644 --- a/mm/memblock.c +++ b/mm/memblock.c @@ -1640,8 +1640,7 @@ int __init_memblock memblock_is_region_memory(phys_addr_t base, phys_addr_t size 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; } |