"v1 -> v2": * move check from memblock_search to memblock_is_memory * modify changelog
When checking the indicated address belongs to the memory region, the memory regions are checked one by one through binary search, which would be a little time consuming. If the indicated address isn't in memory region, then we needn't do the time-sonsuming search. The patch adds more check on the indicated address for that purpose. Signed-off-by: Wanpeng Li <[email protected]> --- mm/memblock.c | 5 +++++ 1 files changed, 5 insertions(+), 0 deletions(-) diff --git a/mm/memblock.c b/mm/memblock.c index 4d9393c..258e81d 100644 --- a/mm/memblock.c +++ b/mm/memblock.c @@ -888,6 +888,11 @@ int __init memblock_is_reserved(phys_addr_t addr) int __init_memblock memblock_is_memory(phys_addr_t addr) { + + if (unlikely(addr < memblock_start_of_DRAM() || + addr >= memblock_end_of_DRAM())) + return 0; + return memblock_search(&memblock.memory, addr) != -1; } -- 1.7.5.4 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
