Subject: linux-next: build failure after merge of the device-mapper tree

From: Stephen Rothwell <[email-masked]>
Date: Fri, 15 Aug 2025 13:05:43 +1000

Hi all,

After merging the device-mapper tree, today's linux-next build (htmldocs)
failed like this:

Sphinx parallel build error:
docutils.utils.SystemMessage: Documentation/admin-guide/device-mapper/dm-pcache.rst:27: (SEVERE/4) Title overline & underline mismatch.

-------------------------------------------------------------------------------
Constructor
===========

Caused by commit

  6fb8fbbaf147 ("dm-pcache: add persistent cache target in device-mapper")

I have applied the following fix patch for today (there may be better).

From: Stephen Rothwell <[email-masked]>
Date: Fri, 15 Aug 2025 13:01:51 +1000
Subject: [PATCH] fix up for "dm-pcache: add persistent cache target in
 device-mapper"

Sphinx parallel build error:
docutils.utils.SystemMessage: Documentation/admin-guide/device-mapper/dm-pcache.rst:27: (SEVERE/4) Title overline & underline mismatch.

Signed-off-by: Stephen Rothwell <[email-masked]>
---
 Documentation/admin-guide/device-mapper/dm-pcache.rst | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/Documentation/admin-guide/device-mapper/dm-pcache.rst b/Documentation/admin-guide/device-mapper/dm-pcache.rst
index e6433fab7bd6..550026219a6f 100644
--- a/Documentation/admin-guide/device-mapper/dm-pcache.rst
+++ b/Documentation/admin-guide/device-mapper/dm-pcache.rst
@@ -25,6 +25,7 @@ Quick feature summary
 * *Log-structured write-back* that preserves backend crash-consistency
 
 -------------------------------------------------------------------------------
+
 Constructor
 ===========
 
@@ -58,6 +59,7 @@ The first time a pmem device is used, dm-pcache formats it automatically
 (super-block, cache_info, etc.).
 
 -------------------------------------------------------------------------------
+
 Status line
 ===========
 
@@ -98,6 +100,7 @@ Field meanings
 ===============================  =============================================
 
 -------------------------------------------------------------------------------
+
 Messages
 ========
 
@@ -108,6 +111,7 @@ Messages
    dmsetup message <dev> 0 gc_percent <0-90>
 
 -------------------------------------------------------------------------------
+
 Theory of operation
 ===================
 
@@ -152,6 +156,7 @@ range when it is inserted and stores it in the on-media key.  Reads
 validate the CRC before copying to the caller.
 
 -------------------------------------------------------------------------------
+
 Failure handling
 ================
 
@@ -164,6 +169,7 @@ Failure handling
   use-after-free keys.
 
 -------------------------------------------------------------------------------
+
 Limitations & TODO
 ==================
 
@@ -173,6 +179,7 @@ Limitations & TODO
 * Discard planned.
 
 -------------------------------------------------------------------------------
+
 Example workflow
 ================
 
@@ -197,5 +204,6 @@ Example workflow
    dmsetup remove pcache_sdb
 
 -------------------------------------------------------------------------------
+
 ``dm-pcache`` is under active development; feedback, bug reports and patches
 are very welcome!
-- 
2.50.1

-- 
Cheers,
Stephen Rothwell