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| author | Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com> | 2019-05-28 07:36:25 +0200 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2019-07-04 16:48:00 +0200 |
| commit | 5d49275a27310233964fc3edc8dd097a094ce338 (patch) | |
| tree | 4b792dec2affcd9e58e2bf9b63afbe0f7209accd /arch/powerpc/mm/hugetlbpage.c | |
| parent | powerpc/mm: Handle page table allocation failures (diff) | |
| download | linux-5d49275a27310233964fc3edc8dd097a094ce338.tar.xz linux-5d49275a27310233964fc3edc8dd097a094ce338.zip | |
powerpc/mm/hugetlb: Fix kernel crash if we fail to allocate page table caches
We only check for hugetlb allocations, because with hugetlb we do conditional
registration. For PGD/PUD/PMD levels we register them always in
pgtable_cache_init.
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'arch/powerpc/mm/hugetlbpage.c')
| -rw-r--r-- | arch/powerpc/mm/hugetlbpage.c | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/arch/powerpc/mm/hugetlbpage.c b/arch/powerpc/mm/hugetlbpage.c index 1de0f43a68e5..f55dc110f2ad 100644 --- a/arch/powerpc/mm/hugetlbpage.c +++ b/arch/powerpc/mm/hugetlbpage.c @@ -61,12 +61,17 @@ static int __hugepte_alloc(struct mm_struct *mm, hugepd_t *hpdp, num_hugepd = 1; } + if (!cachep) { + WARN_ONCE(1, "No page table cache created for hugetlb tables"); + return -ENOMEM; + } + new = kmem_cache_alloc(cachep, pgtable_gfp_flags(mm, GFP_KERNEL)); BUG_ON(pshift > HUGEPD_SHIFT_MASK); BUG_ON((unsigned long)new & HUGEPD_SHIFT_MASK); - if (! new) + if (!new) return -ENOMEM; /* |