[merged mm-hotfixes-stable] mm-memory_hotplug-fix-memmap_on_memory-sysfs-value-retrieval.patch removed from -mm tree

[merged mm-hotfixes-stable] mm-memory_hotplug-fix-memmap_on_memory-sysfs-value-retrieval.patch removed from -mm tree

[Andrew Morton]

The quilt patch titled
     Subject: mm/memory_hotplug: fix memmap_on_memory sysfs value retrieval
has been removed from the -mm tree.  Its filename was
     mm-memory_hotplug-fix-memmap_on_memory-sysfs-value-retrieval.patch

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

------------------------------------------------------
From: Sumanth Korikkar <sumanthk@linux.ibm.com>
Subject: mm/memory_hotplug: fix memmap_on_memory sysfs value retrieval
Date: Wed, 10 Jan 2024 15:01:27 +0100

set_memmap_mode() stores the kernel parameter memmap mode as an integer. 
However, the get_memmap_mode() function utilizes param_get_bool() to fetch
the value as a boolean, leading to potential endianness issue.  On
Big-endian architectures, the memmap_on_memory is consistently displayed
as 'N' regardless of its actual status.

To address this endianness problem, the solution involves obtaining the
mode as an integer.  This adjustment ensures the proper display of the
memmap_on_memory parameter, presenting it as one of the following options:
Force, Y, or N.

Link: https://lkml.kernel.org/r/20240110140127.241451-1-sumanthk@linux.ibm.com
Fixes: 2d1f649c7c08 ("mm/memory_hotplug: support memmap_on_memory when memmap is not aligned to pageblocks")
Signed-off-by: Sumanth Korikkar <sumanthk@linux.ibm.com>
Suggested-by: Gerald Schaefer <gerald.schaefer@linux.ibm.com>
Acked-by: David Hildenbrand <david@redhat.com>
Cc: Alexander Gordeev <agordeev@linux.ibm.com>
Cc: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com>
Cc: Heiko Carstens <hca@linux.ibm.com>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Oscar Salvador <osalvador@suse.de>
Cc: Vasily Gorbik <gor@linux.ibm.com>
Cc: <stable@vger.kernel.org>	[6.6+]
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 mm/memory_hotplug.c |    8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

--- a/mm/memory_hotplug.c~mm-memory_hotplug-fix-memmap_on_memory-sysfs-value-retrieval
+++ a/mm/memory_hotplug.c
@@ -101,9 +101,11 @@ static int set_memmap_mode(const char *v
 
 static int get_memmap_mode(char *buffer, const struct kernel_param *kp)
 {
-	if (*((int *)kp->arg) == MEMMAP_ON_MEMORY_FORCE)
-		return sprintf(buffer,  "force\n");
-	return param_get_bool(buffer, kp);
+	int mode = *((int *)kp->arg);
+
+	if (mode == MEMMAP_ON_MEMORY_FORCE)
+		return sprintf(buffer, "force\n");
+	return sprintf(buffer, "%c\n", mode ? 'Y' : 'N');
 }
 
 static const struct kernel_param_ops memmap_mode_ops = {
_

Patches currently in -mm which might be from sumanthk@linux.ibm.com are

mm-memory_hotplug-introduce-mem_prepare_online-mem_finish_offline-notifiers.patch
s390-mm-allocate-vmemmap-pages-from-self-contained-memory-range.patch
s390-sclp-remove-unhandled-memory-notifier-type.patch
s390-mm-implement-mem_prepare_online-mem_finish_offline-notifiers.patch
s390-enable-mhp_memmap_on_memory.patch