mm/mmap.c: use pr_emerg when printing BUG related information

Make sure we actually see the output of validate_mm() and browse_rb()
before triggering a BUG().  pr_info isn't shown by default so the reason
for the BUG() isn't obvious.

Signed-off-by: Sasha Levin <sasha.levin@oracle.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/mm/mmap.c b/mm/mmap.c
index c1f2ea4a0b9960d39940c82f4ba329dad2df74df..c0a3637cdb645b0eed66c18edcd10431bfd5417b 100644 (file)
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -369,20 +369,20 @@ static int browse_rb(struct rb_root *root)
                struct vm_area_struct *vma;
                vma = rb_entry(nd, struct vm_area_struct, vm_rb);
                if (vma->vm_start < prev) {
-                       pr_info("vm_start %lx prev %lx\n", vma->vm_start, prev);
+                       pr_emerg("vm_start %lx prev %lx\n", vma->vm_start, prev);
                        bug = 1;
                }
                if (vma->vm_start < pend) {
-                       pr_info("vm_start %lx pend %lx\n", vma->vm_start, pend);
+                       pr_emerg("vm_start %lx pend %lx\n", vma->vm_start, pend);
                        bug = 1;
                }
                if (vma->vm_start > vma->vm_end) {
-                       pr_info("vm_end %lx < vm_start %lx\n",
+                       pr_emerg("vm_end %lx < vm_start %lx\n",
                                vma->vm_end, vma->vm_start);
                        bug = 1;
                }
                if (vma->rb_subtree_gap != vma_compute_subtree_gap(vma)) {
-                       pr_info("free gap %lx, correct %lx\n",
+                       pr_emerg("free gap %lx, correct %lx\n",
                               vma->rb_subtree_gap,
                               vma_compute_subtree_gap(vma));
                        bug = 1;
@@ -396,7 +396,7 @@ static int browse_rb(struct rb_root *root)
        for (nd = pn; nd; nd = rb_prev(nd))
                j++;
        if (i != j) {
-               pr_info("backwards %d, forwards %d\n", j, i);
+               pr_emerg("backwards %d, forwards %d\n", j, i);
                bug = 1;
        }
        return bug ? -1 : i;
@@ -431,17 +431,17 @@ static void validate_mm(struct mm_struct *mm)
                i++;
        }
        if (i != mm->map_count) {
-               pr_info("map_count %d vm_next %d\n", mm->map_count, i);
+               pr_emerg("map_count %d vm_next %d\n", mm->map_count, i);
                bug = 1;
        }
        if (highest_address != mm->highest_vm_end) {
-               pr_info("mm->highest_vm_end %lx, found %lx\n",
+               pr_emerg("mm->highest_vm_end %lx, found %lx\n",
                       mm->highest_vm_end, highest_address);
                bug = 1;
        }
        i = browse_rb(&mm->mm_rb);
        if (i != mm->map_count) {
-               pr_info("map_count %d rb %d\n", mm->map_count, i);
+               pr_emerg("map_count %d rb %d\n", mm->map_count, i);
                bug = 1;
        }
        BUG_ON(bug);