Merge branch 'merge' of git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc

Pull powerpc fixes from Ben Herrenschmidt:
 "Here are some more powerpc fixes for 3.14

  The main one is a nasty issue with the NUMA balancing support which
  requires a small generic change and the addition of a new accessor to
  set _PAGE_NUMA.  Both have been reviewed and acked by Mel and Rik.

  The changelog should have plenty of details but basically, without
  this fix, we get random user segfaults and/or corruptions due to
  missing TLB/hash flushes.  Aneesh series of 3 patches fixes it.

  We have some vDSO vs.  perf fixes from Anton, some small EEH fixes
  from Gavin, a ppc32 regression vs the stack overflow detector, and a
  fix for the way we handle PCIe host bridge speed settings on pseries
  (which is needed for proper operations of AMD graphics cards on
  Power8)"

* 'merge' of git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc:
  powerpc/eeh: Disable EEH on reboot
  powerpc/eeh: Cleanup on eeh_subsystem_enabled
  powerpc/powernv: Rework EEH reset
  powerpc: Use unstripped VDSO image for more accurate profiling data
  powerpc: Link VDSOs at 0x0
  mm: Use ptep/pmdp_set_numa() for updating _PAGE_NUMA bit
  mm: Dirty accountable change only apply to non prot numa case
  powerpc/mm: Add new "set" flag argument to pte/pmd update function
  powerpc/pseries: Add Gen3 definitions for PCIE link speed
  powerpc/pseries: Fix regression on PCI link speed
  powerpc: Set the correct ksp_limit on ppc32 when switching to irq stack

2 files changed, 10 insertions, 24 deletions

diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index 82166bf974e1..da23eb96779f 100644
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -1545,6 +1545,7 @@ int change_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd,
                                 entry = pmd_mknonnuma(entry);
                         entry = pmd_modify(entry, newprot);
                         ret = HPAGE_PMD_NR;
+                        set_pmd_at(mm, addr, pmd, entry);
                         BUG_ON(pmd_write(entry));
                 } else {
                         struct page *page = pmd_page(*pmd);
@@ -1557,16 +1558,10 @@ int change_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd,
                          */
                         if (!is_huge_zero_page(page) &&
                             !pmd_numa(*pmd)) {
-                                entry = *pmd;
-                                entry = pmd_mknuma(entry);
+                                pmdp_set_numa(mm, addr, pmd);
                                 ret = HPAGE_PMD_NR;
                         }
                 }
-
-                /* Set PMD if cleared earlier */
-                if (ret == HPAGE_PMD_NR)
-                        set_pmd_at(mm, addr, pmd, entry);
-
                 spin_unlock(ptl);
         }
 
diff --git a/mm/mprotect.c b/mm/mprotect.c
index 7332c1785744..769a67a15803 100644
--- a/mm/mprotect.c
+++ b/mm/mprotect.c
@@ -58,36 +58,27 @@ static unsigned long change_pte_range(struct vm_area_struct *vma, pmd_t *pmd,
                                 if (pte_numa(ptent))
                                         ptent = pte_mknonnuma(ptent);
                                 ptent = pte_modify(ptent, newprot);
+                                /*
+                                 * Avoid taking write faults for pages we
+                                 * know to be dirty.
+                                 */
+                                if (dirty_accountable && pte_dirty(ptent))
+                                        ptent = pte_mkwrite(ptent);
+                                ptep_modify_prot_commit(mm, addr, pte, ptent);
                                 updated = true;
                         } else {
                                 struct page *page;
 
-                                ptent = *pte;
                                 page = vm_normal_page(vma, addr, oldpte);
                                 if (page && !PageKsm(page)) {
                                         if (!pte_numa(oldpte)) {
-                                                ptent = pte_mknuma(ptent);
-                                                set_pte_at(mm, addr, pte, ptent);
+                                                ptep_set_numa(mm, addr, pte);
                                                 updated = true;
                                         }
                                 }
                         }
-
-                        /*
-                         * Avoid taking write faults for pages we know to be
-                         * dirty.
-                         */
-                        if (dirty_accountable && pte_dirty(ptent)) {
-                                ptent = pte_mkwrite(ptent);
-                                updated = true;
-                        }
-
                         if (updated)
                                 pages++;
-
-                        /* Only !prot_numa always clears the pte */
-                        if (!prot_numa)
-                                ptep_modify_prot_commit(mm, addr, pte, ptent);
                 } else if (IS_ENABLED(CONFIG_MIGRATION) && !pte_file(oldpte)) {
                         swp_entry_t entry = pte_to_swp_entry(oldpte);