linux-kernel - [PATCH v2 18/36] mm: Update vma_iter_store() to use MAS_WARN

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Date:   Fri,  5 May 2023 13:41:46 -0400
From:   "Liam R. Howlett" <Liam.Howlett@...cle.com>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     maple-tree@...ts.infradead.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org,
        "Liam R. Howlett" <Liam.Howlett@...cle.com>,
        Sergey Senozhatsky <senozhatsky@...omium.org>
Subject: [PATCH v2 18/36] mm: Update vma_iter_store() to use MAS_WARN_ON()

MAS_WARN_ON() will provide more information on the maple state and can
be more useful for debugging.  Use this version of WARN_ON() in the
debugging code when storing to the tree.

Update the printk to a pr_warn(), but this will only be printed when
maple tree debug is enabled anyways.

Making all print statements into one will keep them together on a busy
terminal.

Cc: Sergey Senozhatsky <senozhatsky@...omium.org>
Signed-off-by: Liam R. Howlett <Liam.Howlett@...cle.com>
---
 mm/internal.h | 27 ++++++++++++++++-----------
 1 file changed, 16 insertions(+), 11 deletions(-)

diff --git a/mm/internal.h b/mm/internal.h
index 8d1a8bd001247..6112108322461 100644
--- a/mm/internal.h
+++ b/mm/internal.h
@@ -1047,18 +1047,23 @@ static inline void vma_iter_store(struct vma_iterator *vmi,
 {
 
 #if defined(CONFIG_DEBUG_VM_MAPLE_TREE)
-	if (WARN_ON(vmi->mas.node != MAS_START && vmi->mas.index > vma->vm_start)) {
-		printk("%lu > %lu\n", vmi->mas.index, vma->vm_start);
-		printk("store of vma %lu-%lu", vma->vm_start, vma->vm_end);
-		printk("into slot    %lu-%lu", vmi->mas.index, vmi->mas.last);
-		vma_iter_dump_tree(vmi);
+	if (MAS_WARN_ON(&vmi->mas, vmi->mas.node != MAS_START &&
+			vmi->mas.index > vma->vm_start)) {
+		pr_warn("%lx > %lx\n"
+		       "store of vma %lx-%lx\n"
+		       "into slot    %lx-%lx\n",
+		       vmi->mas.index, vma->vm_start,
+		       vma->vm_start, vma->vm_end,
+		       vmi->mas.index, vmi->mas.last);
 	}
-	if (WARN_ON(vmi->mas.node != MAS_START && vmi->mas.last <  vma->vm_start)) {
-		printk("%lu < %lu\n", vmi->mas.last, vma->vm_start);
-		printk("store of vma %lu-%lu", vma->vm_start, vma->vm_end);
-		printk("into slot    %lu-%lu", vmi->mas.index, vmi->mas.last);
-		mt_dump(vmi->mas.tree, mt_dump_hex);
-		vma_iter_dump_tree(vmi);
+	if (MAS_WARN_ON(&vmi->mas, vmi->mas.node != MAS_START &&
+			vmi->mas.last <  vma->vm_start)) {
+		pr_warn("%lx < %lx\n"
+		       "store of vma %lx-%lx\n"
+		       "into slot    %lx-%lx\n",
+		       vmi->mas.last, vma->vm_start,
+		       vma->vm_start, vma->vm_end,
+		       vmi->mas.index, vmi->mas.last);
 	}
 #endif
 
-- 
2.39.2