mm: use VM_BUG_ON_MM where possible

Dump the contents of the relevant struct_mm when we hit the bug condition.
Signed-off-by: NSasha Levin <sasha.levin@oracle.com>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

kernel/fork.c

@@ -601,9 +601,8 @@ static void check_mm(struct mm_struct *mm)
 			printk(KERN_ALERT "BUG: Bad rss-counter state "
 					  "mm:%p idx:%d val:%ld\n", mm, i, x);
 	}
-
 #if defined(CONFIG_TRANSPARENT_HUGEPAGE) && !USE_SPLIT_PMD_PTLOCKS
-	VM_BUG_ON(mm->pmd_huge_pte);
+	VM_BUG_ON_MM(mm->pmd_huge_pte, mm);
 #endif
 }
 

kernel/sys.c

@@ -1634,7 +1634,7 @@ static int prctl_set_mm_exe_file_locked(struct mm_struct *mm, unsigned int fd)
 	struct inode *inode;
 	int err;
 
-	VM_BUG_ON(!rwsem_is_locked(&mm->mmap_sem));
+	VM_BUG_ON_MM(!rwsem_is_locked(&mm->mmap_sem), mm);
 
 	exe = fdget(fd);
 	if (!exe.file)

mm/huge_memory.c

@@ -2048,7 +2048,7 @@ int __khugepaged_enter(struct mm_struct *mm)
 		return -ENOMEM;
 
 	/* __khugepaged_exit() must not run from under us */
-	VM_BUG_ON(khugepaged_test_exit(mm));
+	VM_BUG_ON_MM(khugepaged_test_exit(mm), mm);
 	if (unlikely(test_and_set_bit(MMF_VM_HUGEPAGE, &mm->flags))) {
 		free_mm_slot(mm_slot);
 		return 0;

mm/mlock.c

@@ -235,7 +235,7 @@ long __mlock_vma_pages_range(struct vm_area_struct *vma,
 	VM_BUG_ON(end   & ~PAGE_MASK);
 	VM_BUG_ON_VMA(start < vma->vm_start, vma);
 	VM_BUG_ON_VMA(end   > vma->vm_end, vma);
-	VM_BUG_ON(!rwsem_is_locked(&mm->mmap_sem));
+	VM_BUG_ON_MM(!rwsem_is_locked(&mm->mmap_sem), mm);
 
 	gup_flags = FOLL_TOUCH | FOLL_MLOCK;
 	/*

mm/mmap.c

@@ -410,8 +410,9 @@ static void validate_mm_rb(struct rb_root *root, struct vm_area_struct *ignore)
 	for (nd = rb_first(root); nd; nd = rb_next(nd)) {
 		struct vm_area_struct *vma;
 		vma = rb_entry(nd, struct vm_area_struct, vm_rb);
-		BUG_ON(vma != ignore &&
-		       vma->rb_subtree_gap != vma_compute_subtree_gap(vma));
+		VM_BUG_ON_VMA(vma != ignore &&
+			vma->rb_subtree_gap != vma_compute_subtree_gap(vma),
+			vma);
 	}
 }
 
@@ -448,7 +449,7 @@ static void validate_mm(struct mm_struct *mm)
 			pr_emerg("map_count %d rb %d\n", mm->map_count, i);
 		bug = 1;
 	}
-	BUG_ON(bug);
+	VM_BUG_ON_MM(bug, mm);
 }
 #else
 #define validate_mm_rb(root, ignore) do { } while (0)

mm/pagewalk.c

@@ -177,7 +177,7 @@ int walk_page_range(unsigned long addr, unsigned long end,
 	if (!walk->mm)
 		return -EINVAL;
 
-	VM_BUG_ON(!rwsem_is_locked(&walk->mm->mmap_sem));
+	VM_BUG_ON_MM(!rwsem_is_locked(&walk->mm->mmap_sem), walk->mm);
 
 	pgd = pgd_offset(walk->mm, addr);
 	do {