Re: [PATCH] mm/hugetlb: Get rid of NODEMASK_ALLOC

From: Mike Kravetz
Date: Tue Apr 02 2019 - 16:41:00 EST

On 4/2/19 6:34 AM, Oscar Salvador wrote:
> NODEMASK_ALLOC is used to allocate a nodemask bitmap, ant it does it by
> first determining whether it should be allocated in the stack or dinamically
> depending on NODES_SHIFT.
> Right now, it goes the dynamic path whenever the nodemask_t is above 32
> bytes.
> Although we could bump it to a reasonable value, the largest a nodemask_t
> can get is 128 bytes, so since __nr_hugepages_store_common is called from
> a rather shore stack we can just get rid of the NODEMASK_ALLOC call here.
In addition, the possible call stacks after this routine are not too deep.
Worst case is high order page allocation.

> This reduces some code churn and complexity.
> Signed-off-by: Oscar Salvador <osalvador@xxxxxxx>

Not a huge deal, but a few typos in the commit message. Thanks for the
clean up.
Reviewed-by: Mike Kravetz <mike.kravetz@xxxxxxxxxx>

Mike Kravetz