patches/old/mm-add-bitmap-mm-flags-field-fix.patch

From: Lorenzo Stoakes <lorenzo.stoakes@oracle.com>
Subject: mm: place __private in correct place, const-ify __mm_flags_get_word
Date: Wed, 13 Aug 2025 20:40:10 +0100

The __private sparse indicator was placed in the wrong location, resulting
in sparse errors, correct this by placing it where it ought to be.

Also, share some code for __mm_flags_get_word() and const-ify it to be
consistent.

Finally, fixup inconsistency in __mm_flags_set_word() param alignment.

Link: https://lkml.kernel.org/r/d4ba117d-6234-4069-b871-254d152d7d21@lucifer.local
Signed-off-by: Lorenzo Stoakes <lorenzo.stoakes@oracle.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 include/linux/mm_types.h |   23 +++++++++++------------
 1 file changed, 11 insertions(+), 12 deletions(-)

--- a/include/linux/mm_types.h~mm-add-bitmap-mm-flags-field-fix
+++ a/include/linux/mm_types.h
@@ -934,8 +934,8 @@ struct mm_cid {
  */
 #define NUM_MM_FLAG_BITS BITS_PER_LONG
 typedef struct {
-	__private DECLARE_BITMAP(__mm_flags, NUM_MM_FLAG_BITS);
-} mm_flags_t;
+	DECLARE_BITMAP(__mm_flags, NUM_MM_FLAG_BITS);
+} __private mm_flags_t;
 
 struct kioctx_table;
 struct iommu_mm_data;
@@ -1233,17 +1233,8 @@ struct mm_struct {
 	unsigned long cpu_bitmap[];
 };
 
-/* Read the first system word of mm flags, non-atomically. */
-static inline unsigned long __mm_flags_get_word(struct mm_struct *mm)
-{
-	unsigned long *bitmap = ACCESS_PRIVATE(&mm->_flags, __mm_flags);
-
-	return bitmap_read(bitmap, 0, BITS_PER_LONG);
-}
-
 /* Set the first system word of mm flags, non-atomically. */
-static inline void __mm_flags_set_word(struct mm_struct *mm,
-				       unsigned long value)
+static inline void __mm_flags_set_word(struct mm_struct *mm, unsigned long value)
 {
 	unsigned long *bitmap = ACCESS_PRIVATE(&mm->_flags, __mm_flags);
 
@@ -1256,6 +1247,14 @@ static inline const unsigned long *__mm_
 	return (const unsigned long *)ACCESS_PRIVATE(&mm->_flags, __mm_flags);
 }
 
+/* Read the first system word of mm flags, non-atomically. */
+static inline unsigned long __mm_flags_get_word(const struct mm_struct *mm)
+{
+	const unsigned long *bitmap = __mm_flags_get_bitmap(mm);
+
+	return bitmap_read(bitmap, 0, BITS_PER_LONG);
+}
+
 #define MM_MT_FLAGS	(MT_FLAGS_ALLOC_RANGE | MT_FLAGS_LOCK_EXTERN | \
 			 MT_FLAGS_USE_RCU)
 extern struct mm_struct init_mm;
_