net/mlx4_en: Fix mixed PFC and Global pause user control requests

[pandora-kernel.git] / mm / nommu.c

diff --git a/mm/nommu.c b/mm/nommu.c
index b982290..d0cb11f 100644 (file)
--- a/mm/nommu.c
+++ b/mm/nommu.c
@@ -696,9 +696,11 @@ static void add_vma_to_mm(struct mm_struct *mm, struct vm_area_struct *vma)
        if (vma->vm_file) {
                mapping = vma->vm_file->f_mapping;
 
+               mutex_lock(&mapping->i_mmap_mutex);
                flush_dcache_mmap_lock(mapping);
                vma_prio_tree_insert(vma, &mapping->i_mmap);
                flush_dcache_mmap_unlock(mapping);
+               mutex_unlock(&mapping->i_mmap_mutex);
        }
 
        /* add the VMA to the tree */
@@ -760,9 +762,11 @@ static void delete_vma_from_mm(struct vm_area_struct *vma)
        if (vma->vm_file) {
                mapping = vma->vm_file->f_mapping;
 
+               mutex_lock(&mapping->i_mmap_mutex);
                flush_dcache_mmap_lock(mapping);
                vma_prio_tree_remove(vma, &mapping->i_mmap);
                flush_dcache_mmap_unlock(mapping);
+               mutex_unlock(&mapping->i_mmap_mutex);
        }
 
        /* remove from the MM's tree and list */
@@ -775,8 +779,6 @@ static void delete_vma_from_mm(struct vm_area_struct *vma)
 
        if (vma->vm_next)
                vma->vm_next->vm_prev = vma->vm_prev;
-
-       vma->vm_mm = NULL;
 }
 
 /*
@@ -805,7 +807,7 @@ struct vm_area_struct *find_vma(struct mm_struct *mm, unsigned long addr)
        struct vm_area_struct *vma;
 
        /* check the cache first */
-       vma = mm->mmap_cache;
+       vma = ACCESS_ONCE(mm->mmap_cache);
        if (vma && vma->vm_start <= addr && vma->vm_end > addr)
                return vma;
 
@@ -1823,6 +1825,16 @@ int remap_pfn_range(struct vm_area_struct *vma, unsigned long addr,
 }
 EXPORT_SYMBOL(remap_pfn_range);
 
+int vm_iomap_memory(struct vm_area_struct *vma, phys_addr_t start, unsigned long len)
+{
+       unsigned long pfn = start >> PAGE_SHIFT;
+       unsigned long vm_len = vma->vm_end - vma->vm_start;
+
+       pfn += vma->vm_pgoff;
+       return io_remap_pfn_range(vma, vma->vm_start, pfn, vm_len, vma->vm_page_prot);
+}
+EXPORT_SYMBOL(vm_iomap_memory);
+
 int remap_vmalloc_range(struct vm_area_struct *vma, void *addr,
                        unsigned long pgoff)
 {
@@ -1873,7 +1885,7 @@ EXPORT_SYMBOL(unmap_mapping_range);
  */
 int __vm_enough_memory(struct mm_struct *mm, long pages, int cap_sys_admin)
 {
-       unsigned long free, allowed;
+       long free, allowed;
 
        vm_acct_memory(pages);
 
@@ -2052,6 +2064,7 @@ int nommu_shrink_inode_mappings(struct inode *inode, size_t size,
        high = (size + PAGE_SIZE - 1) >> PAGE_SHIFT;
 
        down_write(&nommu_region_sem);
+       mutex_lock(&inode->i_mapping->i_mmap_mutex);
 
        /* search for VMAs that fall within the dead zone */
        vma_prio_tree_foreach(vma, &iter, &inode->i_mapping->i_mmap,
@@ -2059,6 +2072,7 @@ int nommu_shrink_inode_mappings(struct inode *inode, size_t size,
                /* found one - only interested if it's shared out of the page
                 * cache */
                if (vma->vm_flags & VM_SHARED) {
+                       mutex_unlock(&inode->i_mapping->i_mmap_mutex);
                        up_write(&nommu_region_sem);
                        return -ETXTBSY; /* not quite true, but near enough */
                }
@@ -2086,6 +2100,7 @@ int nommu_shrink_inode_mappings(struct inode *inode, size_t size,
                }
        }
 
+       mutex_unlock(&inode->i_mapping->i_mmap_mutex);
        up_write(&nommu_region_sem);
        return 0;
 }