On 01/04/2013 10:56 PM, Tejun Heo wrote: > On Fri, Jan 04, 2013 at 05:10:50PM +0800, Lin Feng wrote: >> The memmove span covers from (next+1) to the end of the array, and the index >> of next is (i+1), so the index of (next+1) is (i+2). So the size of remaining >> array elements is (type->cnt - (i + 2)). >> >> PS. It seems that memblock_merge_regions() could be made some improvement: >> we need't memmove the remaining array elements until we find a none-mergable >> element, but now we memmove everytime we find a neighboring compatible region. >> I'm not sure if the trial is worth though. >> >> Cc: Tejun Heo <tj@xxxxxxxxxx> >> Signed-off-by: Lin Feng <linfeng@xxxxxxxxxxxxxx> >> --- >> mm/memblock.c | 2 +- >> 1 file changed, 1 insertion(+), 1 deletion(-) >> >> diff --git a/mm/memblock.c b/mm/memblock.c >> index 6259055..85ce056 100644 >> --- a/mm/memblock.c >> +++ b/mm/memblock.c >> @@ -314,7 +314,7 @@ static void __init_memblock memblock_merge_regions(struct memblock_type *type) >> } >> >> this->size += next->size; >> - memmove(next, next + 1, (type->cnt - (i + 1)) * sizeof(*next)); >> + memmove(next, next + 1, (type->cnt - (i + 2)) * sizeof(*next)); > > Heh, that's confusing. Nice catch. Can you please also add a comment > explaning the index so that it's less confusing for the future readers? Hi Tejun, Glad to. I will resend it soon. thanks, linfeng > > Thanks. > -- 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>