+ tools-mm-thpmaps-handle-carriage-returns-and-non-utf-8-filenames.patch added to mm-nonmm-unstable branch

[Andrew Morton <akpm@linux-foundation.org>]

The patch titled
     Subject: tools/mm/thpmaps: handle carriage returns and non-UTF-8 filenames
has been added to the -mm mm-nonmm-unstable branch.  Its filename is
     tools-mm-thpmaps-handle-carriage-returns-and-non-utf-8-filenames.patch

This patch will shortly appear at
     https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/tools-mm-thpmaps-handle-carriage-returns-and-non-utf-8-filenames.patch

This patch will later appear in the mm-nonmm-unstable branch at
    git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

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------------------------------------------------------
From: Weilin Tong <tongweilin@linux.alibaba.com>
Subject: tools/mm/thpmaps: handle carriage returns and non-UTF-8 filenames
Date: Wed, 04 Nov 2026 14:16:41 +0800

VMAList opens smaps with universal newline handling and strict decoding.
A carriage return in a mapped filename can split a header into multiple
records, while non-UTF-8 bytes cause UnicodeDecodeError.

Read LF-terminated records and use surrogateescape to preserve filename
bytes. Escape filename characters that stdout cannot encode to avoid
UnicodeEncodeError when printing mapping names.

Link: https://lore.kernel.org/20261104061641.1115805-1-tongweilin@linux.alibaba.com
Fixes: 2444172cfde4 ("tools/mm: add thpmaps script to dump THP usage info")
Signed-off-by: Weilin Tong <tongweilin@linux.alibaba.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Suggested-by: Andrew Morton <akpm@linux-foundation.org>
Link: https://lore.kernel.org/linux-mm/20261101211644.c63a2028bbede0f763f41f80@linux-foundation.org/
Reviewed-by: Ryan Roberts <ryan.roberts@arm.com>
Cc: David Hildenbrand <david@kernel.org>
Cc: Baolin Wang <baolin.wang@linux.alibaba.com>
---

 tools/mm/thpmaps |    7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

--- a/tools/mm/thpmaps~tools-mm-thpmaps-handle-carriage-returns-and-non-utf-8-filenames
+++ a/tools/mm/thpmaps
@@ -196,7 +196,8 @@ class VMAList:
     # instance to receive VMAs.
     def __init__(self, pid='self', stats=[]):
         self.vmas = []
-        with open(f'/proc/{pid}/smaps', 'r') as file:
+        with open(f'/proc/{pid}/smaps', 'r', newline='\n',
+                  errors='surrogateescape') as file:
             for line in file:
                 elements = line.rstrip('\n').split(maxsplit=5)
                 if '-' in elements[0]:
@@ -363,12 +364,14 @@ def cont_parse(vma, order, ranges, anons
 def vma_print(vma, pid):
     # Prints a VMA instance in a format similar to smaps. The main difference is
     # that the pid is included as the first value.
+    name = vma.name.encode(sys.stdout.encoding, errors='backslashreplace')
+    name = name.decode(sys.stdout.encoding)
     print("{:010d}: {:016x}-{:016x} {}{}{}{} {:08x} {:02x}:{:02x} {:08x} {}"
         .format(
             pid, vma.start, vma.end,
             'r' if vma.read else '-', 'w' if vma.write else '-',
             'x' if vma.execute else '-', 'p' if vma.private else 's',
-            vma.pgoff, vma.major, vma.minor, vma.inode, vma.name
+            vma.pgoff, vma.major, vma.minor, vma.inode, name
         ))
 
 
_

Patches currently in -mm which might be from tongweilin@linux.alibaba.com are

tools-mm-thpmaps-fix-partial-thp-anon-file-accounting.patch
tools-mm-thpmaps-fix-missing-order-1-file-thp-statistics.patch
tools-mm-thpmaps-fix-missing-mapping-names.patch
tools-mm-thpmaps-handle-carriage-returns-and-non-utf-8-filenames.patch