mm/khugepaged: fix crashes due to misaccounted holes

[android-x86/kernel.git] / mm / shmem.c

diff --git a/mm/shmem.c b/mm/shmem.c
index e30ffaa..54911bb 100644 (file)
--- a/mm/shmem.c
+++ b/mm/shmem.c
@@ -283,12 +283,14 @@ bool shmem_charge(struct inode *inode, long pages)
        if (!shmem_inode_acct_block(inode, pages))
                return false;
 
+       /* nrpages adjustment first, then shmem_recalc_inode() when balanced */
+       inode->i_mapping->nrpages += pages;
+
        spin_lock_irqsave(&info->lock, flags);
        info->alloced += pages;
        inode->i_blocks += pages * BLOCKS_PER_PAGE;
        shmem_recalc_inode(inode);
        spin_unlock_irqrestore(&info->lock, flags);
-       inode->i_mapping->nrpages += pages;
 
        return true;
 }
@@ -298,6 +300,8 @@ void shmem_uncharge(struct inode *inode, long pages)
        struct shmem_inode_info *info = SHMEM_I(inode);
        unsigned long flags;
 
+       /* nrpages adjustment done by __delete_from_page_cache() or caller */
+
        spin_lock_irqsave(&info->lock, flags);
        info->alloced -= pages;
        inode->i_blocks -= pages * BLOCKS_PER_PAGE;