Merge with /home/shaggy/git/linus-clean/

Signed-off-by: Dave Kleikamp <shaggy@austin.ibm.com>

3 files changed, 20 insertions, 3 deletions

diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index fbd1111ea119..6bf720bc662c 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -301,6 +301,7 @@ void unmap_hugepage_range(struct vm_area_struct *vma, unsigned long start,
 {
         struct mm_struct *mm = vma->vm_mm;
         unsigned long address;
+        pte_t *ptep;
         pte_t pte;
         struct page *page;
 
@@ -309,9 +310,17 @@ void unmap_hugepage_range(struct vm_area_struct *vma, unsigned long start,
         BUG_ON(end & ~HPAGE_MASK);
 
         for (address = start; address < end; address += HPAGE_SIZE) {
-                pte = huge_ptep_get_and_clear(mm, address, huge_pte_offset(mm, address));
+                ptep = huge_pte_offset(mm, address);
+                if (! ptep)
+                        /* This can happen on truncate, or if an
+                         * mmap() is aborted due to an error before
+                         * the prefault */
+                        continue;
+
+                pte = huge_ptep_get_and_clear(mm, address, ptep);
                 if (pte_none(pte))
                         continue;
+
                 page = pte_page(pte);
                 put_page(page);
         }
diff --git a/mm/mmap.c b/mm/mmap.c
index da3fa90a0aae..404319477e71 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -143,7 +143,11 @@ int __vm_enough_memory(long pages, int cap_sys_admin)
            leave 3% of the size of this process for other processes */
         allowed -= current->mm->total_vm / 32;
 
-        if (atomic_read(&vm_committed_space) < allowed)
+        /*
+         * cast `allowed' as a signed long because vm_committed_space
+         * sometimes has a negative value
+         */
+        if (atomic_read(&vm_committed_space) < (long)allowed)
                 return 0;
 
         vm_unacct_memory(pages);
diff --git a/mm/nommu.c b/mm/nommu.c
index ce74452c02d9..fd4e8df0f02d 100644
--- a/mm/nommu.c
+++ b/mm/nommu.c
@@ -1167,7 +1167,11 @@ int __vm_enough_memory(long pages, int cap_sys_admin)
            leave 3% of the size of this process for other processes */
         allowed -= current->mm->total_vm / 32;
 
-        if (atomic_read(&vm_committed_space) < allowed)
+        /*
+         * cast `allowed' as a signed long because vm_committed_space
+         * sometimes has a negative value
+         */
+        if (atomic_read(&vm_committed_space) < (long)allowed)
                 return 0;
 
         vm_unacct_memory(pages);