On Wed 21-12-16 23:30:32, Wei Yang wrote: > 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". OK, the patch looks correct. I doubt it makes any real difference but I do not see it being harmful. > Signed-off-by: Wei Yang <richard.weiyang@xxxxxxxxx> Acked-by: Michal Hocko <mhocko@xxxxxxxx> > --- > mm/memblock.c | 3 +-- > 1 file changed, 1 insertion(+), 2 deletions(-) > > diff --git a/mm/memblock.c b/mm/memblock.c > index 7608bc3..4929e06 100644 > --- a/mm/memblock.c > +++ b/mm/memblock.c > @@ -1615,8 +1615,7 @@ 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; > } > > -- > 2.5.0 -- Michal Hocko SUSE Labs -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>