Merge branch 'x86-platform-for-linus' of git://git.kernel.org/pub/scm/linux/kernel...

[linux-2.6-block.git] / mm / swapfile.c

diff --git a/mm/swapfile.c b/mm/swapfile.c
index 00a962caab1acec6eeed984756e573a8c0c64b15..dae42f380d6ebcde88d3aaef6aa3cb1d64e0f5a3 100644 (file)
--- a/mm/swapfile.c
+++ b/mm/swapfile.c
@@ -932,9 +932,7 @@ static inline int unuse_pmd_range(struct vm_area_struct *vma, pud_t *pud,
        pmd = pmd_offset(pud, addr);
        do {
                next = pmd_addr_end(addr, end);
-               if (unlikely(pmd_trans_huge(*pmd)))
-                       continue;
-               if (pmd_none_or_clear_bad(pmd))
+               if (pmd_none_or_trans_huge_or_clear_bad(pmd))
                        continue;
                ret = unuse_pte_range(vma, pmd, addr, next, entry, page);
                if (ret)
@@ -1563,6 +1561,8 @@ SYSCALL_DEFINE1(swapoff, const char __user *, specialfile)
        if (!capable(CAP_SYS_ADMIN))
                return -EPERM;
 
+       BUG_ON(!current->mm);
+
        pathname = getname(specialfile);
        err = PTR_ERR(pathname);
        if (IS_ERR(pathname))
@@ -1590,7 +1590,7 @@ SYSCALL_DEFINE1(swapoff, const char __user *, specialfile)
                spin_unlock(&swap_lock);
                goto out_dput;
        }
-       if (!security_vm_enough_memory(p->pages))
+       if (!security_vm_enough_memory_mm(current->mm, p->pages))
                vm_unacct_memory(p->pages);
        else {
                err = -ENOMEM;
@@ -2105,7 +2105,7 @@ SYSCALL_DEFINE2(swapon, const char __user *, specialfile, int, swap_flags)
                        p->flags |= SWP_SOLIDSTATE;
                        p->cluster_next = 1 + (random32() % p->highest_bit);
                }
-               if (discard_swap(p) == 0 && (swap_flags & SWAP_FLAG_DISCARD))
+               if ((swap_flags & SWAP_FLAG_DISCARD) && discard_swap(p) == 0)
                        p->flags |= SWP_DISCARDABLE;
        }
 
@@ -2289,58 +2289,6 @@ int swapcache_prepare(swp_entry_t entry)
        return __swap_duplicate(entry, SWAP_HAS_CACHE);
 }
 
-/*
- * swap_lock prevents swap_map being freed. Don't grab an extra
- * reference on the swaphandle, it doesn't matter if it becomes unused.
- */
-int valid_swaphandles(swp_entry_t entry, unsigned long *offset)
-{
-       struct swap_info_struct *si;
-       int our_page_cluster = page_cluster;
-       pgoff_t target, toff;
-       pgoff_t base, end;
-       int nr_pages = 0;
-
-       if (!our_page_cluster)  /* no readahead */
-               return 0;
-
-       si = swap_info[swp_type(entry)];
-       target = swp_offset(entry);
-       base = (target >> our_page_cluster) << our_page_cluster;
-       end = base + (1 << our_page_cluster);
-       if (!base)              /* first page is swap header */
-               base++;
-
-       spin_lock(&swap_lock);
-       if (end > si->max)      /* don't go beyond end of map */
-               end = si->max;
-
-       /* Count contiguous allocated slots above our target */
-       for (toff = target; ++toff < end; nr_pages++) {
-               /* Don't read in free or bad pages */
-               if (!si->swap_map[toff])
-                       break;
-               if (swap_count(si->swap_map[toff]) == SWAP_MAP_BAD)
-                       break;
-       }
-       /* Count contiguous allocated slots below our target */
-       for (toff = target; --toff >= base; nr_pages++) {
-               /* Don't read in free or bad pages */
-               if (!si->swap_map[toff])
-                       break;
-               if (swap_count(si->swap_map[toff]) == SWAP_MAP_BAD)
-                       break;
-       }
-       spin_unlock(&swap_lock);
-
-       /*
-        * Indicate starting offset, and return number of pages to get:
-        * if only 1, say 0, since there's then no readahead to be done.
-        */
-       *offset = ++toff;
-       return nr_pages? ++nr_pages: 0;
-}
-
 /*
  * add_swap_count_continuation - called when a swap count is duplicated
  * beyond SWAP_MAP_MAX, it allocates a new page and links that to the entry's