squash mm: Export migrate_page_... : also make it non-static

[GitHub/mt8127/android_kernel_alcatel_ttab.git] / mm / mmap.c

diff --git a/mm/mmap.c b/mm/mmap.c
index f681e1842fadc1ccd8d7188a7ca1688c73548111..70ff9b41c97089124f67d712e3b29c45fbd11000 100644 (file)
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -127,7 +127,7 @@ EXPORT_SYMBOL_GPL(vm_memory_committed);
  */
 int __vm_enough_memory(struct mm_struct *mm, long pages, int cap_sys_admin)
 {
-       unsigned long free, allowed, reserve;
+       long free, allowed, reserve;
 
        vm_acct_memory(pages);
 
@@ -193,7 +193,7 @@ int __vm_enough_memory(struct mm_struct *mm, long pages, int cap_sys_admin)
         */
        if (mm) {
                reserve = sysctl_user_reserve_kbytes >> (PAGE_SHIFT - 10);
-               allowed -= min(mm->total_vm / 32, reserve);
+               allowed -= min_t(long, mm->total_vm / 32, reserve);
        }
 
        if (percpu_counter_read_positive(&vm_committed_as) < allowed)
@@ -865,7 +865,7 @@ again:                      remove_next = 1 + (end > next->vm_end);
                if (next->anon_vma)
                        anon_vma_merge(vma, next);
                mm->map_count--;
-               vma_set_policy(vma, vma_policy(next));
+               mpol_put(vma_policy(next));
                kmem_cache_free(vm_area_cachep, next);
                /*
                 * In mprotect's case 6 (see comments on vma_merge),
@@ -1853,7 +1853,7 @@ arch_get_unmapped_area(struct file *filp, unsigned long addr,
        struct vm_area_struct *vma;
        struct vm_unmapped_area_info info;
 
-       if (len > TASK_SIZE)
+       if (len > TASK_SIZE - mmap_min_addr)
                return -ENOMEM;
 
        if (flags & MAP_FIXED)
@@ -1862,7 +1862,7 @@ arch_get_unmapped_area(struct file *filp, unsigned long addr,
        if (addr) {
                addr = PAGE_ALIGN(addr);
                vma = find_vma(mm, addr);
-               if (TASK_SIZE - len >= addr &&
+               if (TASK_SIZE - len >= addr && addr >= mmap_min_addr &&
                    (!vma || addr + len <= vma->vm_start))
                        return addr;
        }
@@ -1901,7 +1901,7 @@ arch_get_unmapped_area_topdown(struct file *filp, const unsigned long addr0,
        struct vm_unmapped_area_info info;
 
        /* requested length too big for entire address space */
-       if (len > TASK_SIZE)
+       if (len > TASK_SIZE - mmap_min_addr)
                return -ENOMEM;
 
        if (flags & MAP_FIXED)
@@ -1911,14 +1911,14 @@ arch_get_unmapped_area_topdown(struct file *filp, const unsigned long addr0,
        if (addr) {
                addr = PAGE_ALIGN(addr);
                vma = find_vma(mm, addr);
-               if (TASK_SIZE - len >= addr &&
+               if (TASK_SIZE - len >= addr && addr >= mmap_min_addr &&
                                (!vma || addr + len <= vma->vm_start))
                        return addr;
        }
 
        info.flags = VM_UNMAPPED_AREA_TOPDOWN;
        info.length = len;
-       info.low_limit = PAGE_SIZE;
+       info.low_limit = max(PAGE_SIZE, mmap_min_addr);
        info.high_limit = mm->mmap_base;
        info.align_mask = 0;
        addr = vm_unmapped_area(&info);
@@ -2056,14 +2056,17 @@ static int acct_stack_growth(struct vm_area_struct *vma, unsigned long size, uns
 {
        struct mm_struct *mm = vma->vm_mm;
        struct rlimit *rlim = current->signal->rlim;
-       unsigned long new_start;
+       unsigned long new_start, actual_size;
 
        /* address space limit tests */
        if (!may_expand_vm(mm, grow))
                return -ENOMEM;
 
        /* Stack limit test */
-       if (size > ACCESS_ONCE(rlim[RLIMIT_STACK].rlim_cur))
+       actual_size = size;
+       if (size && (vma->vm_flags & (VM_GROWSUP | VM_GROWSDOWN)))
+               actual_size -= PAGE_SIZE;
+       if (actual_size > ACCESS_ONCE(rlim[RLIMIT_STACK].rlim_cur))
                return -ENOMEM;
 
        /* mlock limit tests */
@@ -2356,7 +2359,7 @@ static void unmap_region(struct mm_struct *mm,
        struct mmu_gather tlb;
 
        lru_add_drain();
-       tlb_gather_mmu(&tlb, mm, 0);
+       tlb_gather_mmu(&tlb, mm, start, end);
        update_hiwater_rss(mm);
        unmap_vmas(&tlb, vma, start, end);
        free_pgtables(&tlb, vma, prev ? prev->vm_end : FIRST_USER_ADDRESS,
@@ -2735,7 +2738,7 @@ void exit_mmap(struct mm_struct *mm)
 
        lru_add_drain();
        flush_cache_mm(mm);
-       tlb_gather_mmu(&tlb, mm, 1);
+       tlb_gather_mmu(&tlb, mm, 0, -1);
        /* update_hiwater_rss(mm) here? but nobody should be looking */
        /* Use -1 here to ensure all VMAs in the mm are unmapped */
        unmap_vmas(&tlb, vma, 0, -1);