[merged mm-stable] mm-huge_memory-refactor-defrag_show-to-use-defrag_flags.patch removed from -mm tree

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

The quilt patch titled
     Subject: mm: huge_memory: refactor defrag_show() to use defrag_flags[]
has been removed from the -mm tree.  Its filename was
     mm-huge_memory-refactor-defrag_show-to-use-defrag_flags.patch

This patch was dropped because it was merged into the mm-stable branch
of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

------------------------------------------------------
From: Breno Leitao <leitao@debian.org>
Subject: mm: huge_memory: refactor defrag_show() to use defrag_flags[]
Date: Wed, 08 Apr 2026 08:47:01 -0700

Replace the hardcoded if/else chain of test_bit() calls and string
literals in defrag_show() with a loop over defrag_flags[] and
defrag_mode_strings[] arrays introduced in the previous commit.

This makes defrag_show() consistent with defrag_store() and eliminates the
duplicated mode name strings.

Link: https://lore.kernel.org/20260408-thp_defrag-v2-2-bc544c1bde4e@debian.org
Signed-off-by: Breno Leitao <leitao@debian.org>
Acked-by: David Hildenbrand (Arm) <david@kernel.org>
Tested-by: Lance Yang <lance.yang@linux.dev>
Reviewed-by: Lance Yang <lance.yang@linux.dev>
Reviewed-by: Barry Song <baohua@kernel.org>
Reviewed-by: Lorenzo Stoakes <ljs@kernel.org>
Tested-by: Zi Yan <ziy@nvidia.com>
Acked-by: Zi Yan <ziy@nvidia.com>
Cc: Baolin Wang <baolin.wang@linux.alibaba.com>
Cc: Dev Jain <dev.jain@arm.com>
Cc: Liam Howlett <liam@infradead.org>
Cc: Nico Pache <npache@redhat.com>
Cc: Ryan Roberts <ryan.roberts@arm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 mm/huge_memory.c |   38 ++++++++++++++++++++++----------------
 1 file changed, 22 insertions(+), 16 deletions(-)

--- a/mm/huge_memory.c~mm-huge_memory-refactor-defrag_show-to-use-defrag_flags
+++ a/mm/huge_memory.c
@@ -455,24 +455,30 @@ static const enum transparent_hugepage_f
 static ssize_t defrag_show(struct kobject *kobj,
 			   struct kobj_attribute *attr, char *buf)
 {
-	const char *output;
+	int active = DEFRAG_NEVER;
+	int len = 0;
+	int i;
 
-	if (test_bit(TRANSPARENT_HUGEPAGE_DEFRAG_DIRECT_FLAG,
-		     &transparent_hugepage_flags))
-		output = "[always] defer defer+madvise madvise never";
-	else if (test_bit(TRANSPARENT_HUGEPAGE_DEFRAG_KSWAPD_FLAG,
-			  &transparent_hugepage_flags))
-		output = "always [defer] defer+madvise madvise never";
-	else if (test_bit(TRANSPARENT_HUGEPAGE_DEFRAG_KSWAPD_OR_MADV_FLAG,
-			  &transparent_hugepage_flags))
-		output = "always defer [defer+madvise] madvise never";
-	else if (test_bit(TRANSPARENT_HUGEPAGE_DEFRAG_REQ_MADV_FLAG,
-			  &transparent_hugepage_flags))
-		output = "always defer defer+madvise [madvise] never";
-	else
-		output = "always defer defer+madvise madvise [never]";
+	for (i = 0; i < ARRAY_SIZE(defrag_flags); i++) {
+		if (test_bit(defrag_flags[i], &transparent_hugepage_flags)) {
+			active = i;
+			break;
+		}
+	}
 
-	return sysfs_emit(buf, "%s\n", output);
+	for (i = 0; i < ARRAY_SIZE(defrag_mode_strings); i++) {
+		if (i == active)
+			len += sysfs_emit_at(buf, len, "[%s] ",
+					     defrag_mode_strings[i]);
+		else
+			len += sysfs_emit_at(buf, len, "%s ",
+					     defrag_mode_strings[i]);
+	}
+
+	/* Replace trailing space with newline */
+	buf[len - 1] = '\n';
+
+	return len;
 }
 
 static ssize_t defrag_store(struct kobject *kobj,
_

Patches currently in -mm which might be from leitao@debian.org are