From: Naoya Horiguchi Date: Wed, 24 Jun 2015 23:56:59 +0000 (-0700) Subject: mm/hugetlb: introduce minimum hugepage order X-Git-Tag: omap-for-v4.2/fixes-rc1^2~125^2~40 X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=641844f5616d7c6597309f560838f996466d7aac;p=pandora-kernel.git mm/hugetlb: introduce minimum hugepage order Currently the initial value of order in dissolve_free_huge_page is 64 or 32, which leads to the following warning in static checker: mm/hugetlb.c:1203 dissolve_free_huge_pages() warn: potential right shift more than type allows '9,18,64' This is a potential risk of infinite loop, because 1 << order (== 0) is used in for-loop like this: for (pfn =3D start_pfn; pfn < end_pfn; pfn +=3D 1 << order) ... So this patch fixes it by using global minimum_order calculated at boot time. text data bss dec hex filename 28313 469 84236 113018 1b97a mm/hugetlb.o 28256 473 84236 112965 1b945 mm/hugetlb.o (patched) Fixes: c8721bbbdd36 ("mm: memory-hotplug: enable memory hotplug to handle hugepage") Reported-by: Dan Carpenter Signed-off-by: Naoya Horiguchi Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- Reading git-diff-tree failed