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>

diff --git a/mm/memory.c b/mm/memory.c
index b12888c..db68af8 100644 (file)
--- 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);

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index d1a80f6..d531e8e 100644 (file)
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -237,8 +237,8 @@ static void bad_page(struct page *page)
                        goto out;
                }
                if (nr_unshown) {
-                       printk(KERN_EMERG
-                               "Bad page state: %lu messages suppressed\n",
+                       printk(KERN_ALERT
+                             "BUG: Bad page state: %lu messages suppressed\n",
                                nr_unshown);
                        nr_unshown = 0;
                }
@@ -247,13 +247,12 @@ static void bad_page(struct page *page)
        if (nr_shown++ == 0)
                resume = jiffies + 60 * HZ;
 
-       printk(KERN_EMERG "Bad page state in process %s  pfn:%05lx\n",
+       printk(KERN_ALERT "BUG: Bad page state in process %s  pfn:%05lx\n",
                current->comm, page_to_pfn(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 "Trying to fix it up, but a reboot is needed\n");
 
        dump_stack();
 out: