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| author | Mike Turquette <mturquette@linaro.org> | 2014-09-26 16:09:39 -0700 |
|---|---|---|
| committer | Mike Turquette <mturquette@linaro.org> | 2014-09-26 16:09:39 -0700 |
| commit | b6b2fe5b6e956c8217a7584472a3ac5c068b61d4 (patch) | |
| tree | 899d38684e674a05fc3e4ae2885529b916583323 /arch/s390/mm/pgtable.c | |
| parent | b52f4914f3be3ff50e7308e3ce03a2ce71195ecc (diff) | |
| parent | b9e742c3164344fece3615aca42ec51b41753908 (diff) | |
| download | linux-b6b2fe5b6e956c8217a7584472a3ac5c068b61d4.tar.bz2 | |
Merge tag 'tegra-clk-3.18' of git://nv-tegra.nvidia.com/user/pdeschrijver/linux into clk-next
Tegra clk updates for 3.18
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 | |