diff options
| -rw-r--r-- | arch/s390/mm/pgtable.c | 3 | ||||
| -rw-r--r-- | mm/huge_memory.c | 13 |
2 files changed, 12 insertions, 4 deletions
diff --git a/arch/s390/mm/pgtable.c b/arch/s390/mm/pgtable.c index 796c932..5d8324c 100644 --- a/arch/s390/mm/pgtable.c +++ b/arch/s390/mm/pgtable.c @@ -505,6 +505,9 @@ static int gmap_connect_pgtable(unsigned long address, unsigned long segment, if (!pmd_present(*pmd) && __pte_alloc(mm, vma, pmd, vmaddr)) return -ENOMEM; + /* large pmds cannot yet be handled */ + if (pmd_large(*pmd)) + return -EFAULT; /* pmd now points to a valid segment table entry. */ rmap = kmalloc(sizeof(*rmap), GFP_KERNEL|__GFP_REPEAT); if (!rmap) diff --git a/mm/huge_memory.c b/mm/huge_memory.c index 6ac89e9..a2f4981 100644 --- a/mm/huge_memory.c +++ b/mm/huge_memory.c @@ -1891,17 +1891,22 @@ out: int hugepage_madvise(struct vm_area_struct *vma, unsigned long *vm_flags, int advice) { - struct mm_struct *mm = vma->vm_mm; - switch (advice) { case MADV_HUGEPAGE: +#ifdef CONFIG_S390 + /* + * qemu blindly sets MADV_HUGEPAGE on all allocations, but s390 + * can't handle this properly after s390_enable_sie, so we simply + * ignore the madvise to prevent qemu from causing a SIGSEGV. + */ + if (mm_has_pgste(vma->vm_mm)) + return 0; +#endif /* * Be somewhat over-protective like KSM for now! */ if (*vm_flags & (VM_HUGEPAGE | VM_NO_THP)) return -EINVAL; - if (mm->def_flags & VM_NOHUGEPAGE) - return -EINVAL; *vm_flags &= ~VM_NOHUGEPAGE; *vm_flags |= VM_HUGEPAGE; /* |
