This is a note to let you know that I've just added the patch titled
x86/mm: Fix marking of unused sub-pmd ranges
to the 5.15-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
x86-mm-fix-marking-of-unused-sub-pmd-ranges.patch
and it can be found in the queue-5.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 280abe14b6e0a38de9cc86fe6a019523aadd8f70 Mon Sep 17 00:00:00 2001
From: Adrian-Ken Rueegsegger <ken@xxxxxxxxxxx>
Date: Mon, 9 May 2022 11:06:37 +0200
Subject: x86/mm: Fix marking of unused sub-pmd ranges
From: Adrian-Ken Rueegsegger <ken@xxxxxxxxxxx>
commit 280abe14b6e0a38de9cc86fe6a019523aadd8f70 upstream.
The unused part precedes the new range spanned by the start, end parameters
of vmemmap_use_new_sub_pmd(). This means it actually goes from
ALIGN_DOWN(start, PMD_SIZE) up to start.
Use the correct address when applying the mark using memset.
Fixes: 8d400913c231 ("x86/vmemmap: handle unpopulated sub-pmd ranges")
Signed-off-by: Adrian-Ken Rueegsegger <ken@xxxxxxxxxxx>
Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Reviewed-by: Oscar Salvador <osalvador@xxxxxxx>
Reviewed-by: David Hildenbrand <david@xxxxxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx
Link: https://lore.kernel.org/r/20220509090637.24152-2-ken@xxxxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/x86/mm/init_64.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
--- a/arch/x86/mm/init_64.c
+++ b/arch/x86/mm/init_64.c
@@ -902,6 +902,8 @@ static void __meminit vmemmap_use_sub_pm
static void __meminit vmemmap_use_new_sub_pmd(unsigned long start, unsigned long end)
{
+ const unsigned long page = ALIGN_DOWN(start, PMD_SIZE);
+
vmemmap_flush_unused_pmd();
/*
@@ -914,8 +916,7 @@ static void __meminit vmemmap_use_new_su
* Mark with PAGE_UNUSED the unused parts of the new memmap range
*/
if (!IS_ALIGNED(start, PMD_SIZE))
- memset((void *)start, PAGE_UNUSED,
- start - ALIGN_DOWN(start, PMD_SIZE));
+ memset((void *)page, PAGE_UNUSED, start - page);
/*
* We want to avoid memset(PAGE_UNUSED) when populating the vmemmap of
Patches currently in stable-queue which might be from ken@xxxxxxxxxxx are
queue-5.15/x86-mm-fix-marking-of-unused-sub-pmd-ranges.patch
