diff options
| author | Johan Hovold <johan@kernel.org> | 2014-09-15 18:07:37 +0200 |
|---|---|---|
| committer | Johan Hovold <johan@kernel.org> | 2014-09-15 18:10:34 +0200 |
| commit | 4b7154ba70bb20a3c024faabdd2bc207b550a813 (patch) | |
| tree | 99a6e1204ec5deaca27bcbfc75ca16d3633433f2 /arch/s390/mm/pgtable.c | |
| parent | adceac14166da8c466223a35ec59c4a4adeef976 (diff) | |
| parent | 9e82bf014195d6f0054982c463575cdce24292be (diff) | |
Merge tag 'v3.17-rc5' into usb-next
USB fixes in Linux 3.17-rc5 are needed to build on top of for 3.18.
Signed-off-by: Johan Hovold <johan@kernel.org>
Diffstat (limited to 'arch/s390/mm/pgtable.c')
| -rw-r--r-- | arch/s390/mm/pgtable.c | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/arch/s390/mm/pgtable.c b/arch/s390/mm/pgtable.c index 19daa53a3da4..5404a6261db9 100644 --- a/arch/s390/mm/pgtable.c +++ b/arch/s390/mm/pgtable.c @@ -986,11 +986,21 @@ int set_guest_storage_key(struct mm_struct *mm, unsigned long addr, pte_t *ptep; down_read(&mm->mmap_sem); +retry: ptep = get_locked_pte(current->mm, addr, &ptl); if (unlikely(!ptep)) { up_read(&mm->mmap_sem); return -EFAULT; } + if (!(pte_val(*ptep) & _PAGE_INVALID) && + (pte_val(*ptep) & _PAGE_PROTECT)) { + pte_unmap_unlock(*ptep, ptl); + if (fixup_user_fault(current, mm, addr, FAULT_FLAG_WRITE)) { + up_read(&mm->mmap_sem); + return -EFAULT; + } + goto retry; + } new = old = pgste_get_lock(ptep); pgste_val(new) &= ~(PGSTE_GR_BIT | PGSTE_GC_BIT | |