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powerpc/mm/hugetlb: Sanity check gigantic hugepage count

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

Signed-off-by: James Yang <James.Yang@freescale.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
James Yang 2014-11-14 12:32:24 -06:00 committed by Benjamin Herrenschmidt
parent 0de3b56b13
commit c4f3eb5fc5
1 changed files with 7 additions and 0 deletions
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7
arch/powerpc/mm/hugetlbpage.c
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@ -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;
}