Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit c4f3eb5f authored by James Yang's avatar James Yang Committed by Benjamin Herrenschmidt
Browse files

powerpc/mm/hugetlb: Sanity check gigantic hugepage count 



Limit the number of gigantic hugepages specified by the
hugepages= parameter to MAX_NUMBER_GPAGES.

Signed-off-by: default avatarJames Yang <James.Yang@freescale.com>
Signed-off-by: default avatarBenjamin Herrenschmidt <benh@kernel.crashing.org>
parent 0de3b56b

arch/powerpc/mm/hugetlbpage.c

+7 −0
Original line number Diff line number Diff line
@@ -355,6 +355,13 @@ static int __init do_gpage_early_setup(char *param, char *val, 
		if (size != 0) {

			if (sscanf(val, "%lu", &npages) <= 0)

				npages = 0;

			if (npages > MAX_NUMBER_GPAGES) {

				pr_warn("MMU: %lu pages requested for page "

					"size %llu KB, limiting to "

					__stringify(MAX_NUMBER_GPAGES) "\n",

					npages, size / 1024);

				npages = MAX_NUMBER_GPAGES;

			}

			gpage_npages[shift_to_mmu_psize(__ffs(size))] = npages;

			size = 0;

		}