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powerpc/mm/hugetlb: Don't enable HugeTLB if we don't have a page table cache

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This makes sure we don't enable HugeTLB if the cache is not configured.
I am still not sure about this. IMHO hugetlb support should be a hardware
support derivative and any cache allocation failure should be handled as I did
in the earlier patch. But then if we were not able to create hugetlb page table
cache, we can as well declare hugetlb support disabled thereby avoiding calling
into allocation routines.

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Aneesh Kumar K.V 2019-05-28 11:06:26 +05:30 committed by Michael Ellerman
parent 5d49275a27
commit ac25ba68fa
1 changed files with 8 additions and 2 deletions
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10
arch/powerpc/mm/hugetlbpage.c
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@ -601,6 +601,7 @@ __setup("hugepagesz=", hugepage_setup_sz);
static int __init hugetlbpage_init(void)
{
bool configured = false;
int psize;
if (hugetlb_disabled) {
@ -651,10 +652,15 @@ static int __init hugetlbpage_init(void)
pgtable_cache_add(pdshift - shift);
else if (IS_ENABLED(CONFIG_PPC_FSL_BOOK3E) || IS_ENABLED(CONFIG_PPC_8xx))
pgtable_cache_add(PTE_T_ORDER);
configured = true;
}
if (IS_ENABLED(CONFIG_HUGETLB_PAGE_SIZE_VARIABLE))
hugetlbpage_init_default();
if (configured) {
if (IS_ENABLED(CONFIG_HUGETLB_PAGE_SIZE_VARIABLE))
hugetlbpage_init_default();
} else
pr_info("Failed to initialize. Disabling HugeTLB");
return 0;
}