badpage: KERN_ALERT BUG instead of KERN_EMERG

bad_page() and rmap Eeek messages have said KERN_EMERG for a few years,
which I've followed in print_bad_pte().  These are serious system errors,
on a par with BUGs, but they're not quite emergencies, and we do our best
to carry on: say KERN_ALERT "BUG: " like the x86 oops does.

And remove the "Trying to fix it up, but a reboot is needed" line: it's
not untrue, but I hope the KERN_ALERT "BUG: " conveys as much.

Signed-off-by: Hugh Dickins <hugh@veritas.com>
Cc: Nick Piggin <nickpiggin@yahoo.com.au>
Cc: Christoph Lameter <cl@linux-foundation.org>
Cc: Mel Gorman <mel@csn.ul.ie>
Cc: Rik van Riel <riel@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 8 insertions, 7 deletions

diff --git a/mm/memory.c b/mm/memory.c
index b12888c1b4e3..db68af8e0bc4 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -397,8 +397,8 @@ static void print_bad_pte(struct vm_area_struct *vma, unsigned long addr,
                         return;
                 }
                 if (nr_unshown) {
-                        printk(KERN_EMERG
-                                "Bad page map: %lu messages suppressed\n",
+                        printk(KERN_ALERT
+                                "BUG: Bad page map: %lu messages suppressed\n",
                                 nr_unshown);
                         nr_unshown = 0;
                 }
@@ -410,26 +410,27 @@ static void print_bad_pte(struct vm_area_struct *vma, unsigned long addr,
         mapping = vma->vm_file ? vma->vm_file->f_mapping : NULL;
         index = linear_page_index(vma, addr);
 
-        printk(KERN_EMERG "Bad page map in process %s  pte:%08llx pmd:%08llx\n",
+        printk(KERN_ALERT
+                "BUG: Bad page map in process %s  pte:%08llx pmd:%08llx\n",
                 current->comm,
                 (long long)pte_val(pte), (long long)pmd_val(*pmd));
         if (page) {
-                printk(KERN_EMERG
+                printk(KERN_ALERT
                 "page:%p flags:%p count:%d mapcount:%d mapping:%p index:%lx\n",
                 page, (void *)page->flags, page_count(page),
                 page_mapcount(page), page->mapping, page->index);
         }
-        printk(KERN_EMERG
+        printk(KERN_ALERT
                 "addr:%p vm_flags:%08lx anon_vma:%p mapping:%p index:%lx\n",
                 (void *)addr, vma->vm_flags, vma->anon_vma, mapping, index);
         /*
          * Choose text because data symbols depend on CONFIG_KALLSYMS_ALL=y
          */
         if (vma->vm_ops)
-                print_symbol(KERN_EMERG "vma->vm_ops->fault: %s\n",
+                print_symbol(KERN_ALERT "vma->vm_ops->fault: %s\n",
                                 (unsigned long)vma->vm_ops->fault);
         if (vma->vm_file && vma->vm_file->f_op)
-                print_symbol(KERN_EMERG "vma->vm_file->f_op->mmap: %s\n",
+                print_symbol(KERN_ALERT "vma->vm_file->f_op->mmap: %s\n",
                                 (unsigned long)vma->vm_file->f_op->mmap);
         dump_stack();
         add_taint(TAINT_BAD_PAGE);