thr3ads.net - Linux Virtualization - Patch "mm/memory_hotplug: use "unsigned long" for PFN in zone_for_pfn_range()" has been added to the 5.4-stable tree [Sep 2021]

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gregkh at linuxfoundation.org
2021-Sep-20 12:59 UTC
Patch "mm/memory_hotplug: use "unsigned long" for PFN in zone_for_pfn_range()" has been added to the 5.4-stable tree

This is a note to let you know that I've just added the patch titled

    mm/memory_hotplug: use "unsigned long" for PFN in
zone_for_pfn_range()

to the 5.4-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:
     mm-memory_hotplug-use-unsigned-long-for-pfn-in-zone_for_pfn_range.patch
and it can be found in the queue-5.4 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable at vger.kernel.org> know about it.

>From 7cf209ba8a86410939a24cb1aeb279479a7e0ca6 Mon Sep 17 00:00:00 2001From: David Hildenbrand <david at redhat.com>
Date: Tue, 7 Sep 2021 19:54:59 -0700
Subject: mm/memory_hotplug: use "unsigned long" for PFN in
zone_for_pfn_range()

From: David Hildenbrand <david at redhat.com>

commit 7cf209ba8a86410939a24cb1aeb279479a7e0ca6 upstream.

Patch series "mm/memory_hotplug: preparatory patches for new online policy
and memory"

These are all cleanups and one fix previously sent as part of [1]:
[PATCH v1 00/12] mm/memory_hotplug: "auto-movable" online policy and
memory
groups.

These patches make sense even without the other series, therefore I pulled
them out to make the other series easier to digest.

[1] https://lkml.kernel.org/r/20210607195430.48228-1-david at redhat.com

This patch (of 4):

Checkpatch complained on a follow-up patch that we are using
"unsigned"
here, which defaults to "unsigned int" and checkpatch is correct.

As we will search for a fitting zone using the wrong pfn, we might end
up onlining memory to one of the special kernel zones, such as ZONE_DMA,
which can end badly as the onlined memory does not satisfy properties of
these zones.

Use "unsigned long" instead, just as we do in other places when
handling
PFNs.  This can bite us once we have physical addresses in the range of
multiple TB.

Link: https://lkml.kernel.org/r/20210712124052.26491-2-david at redhat.com
Fixes: e5e689302633 ("mm, memory_hotplug: display allowed zones in the
preferred ordering")
Signed-off-by: David Hildenbrand <david at redhat.com>
Reviewed-by: Pankaj Gupta <pankaj.gupta at ionos.com>
Reviewed-by: Muchun Song <songmuchun at bytedance.com>
Reviewed-by: Oscar Salvador <osalvador at suse.de>
Cc: David Hildenbrand <david at redhat.com>
Cc: Vitaly Kuznetsov <vkuznets at redhat.com>
Cc: "Michael S. Tsirkin" <mst at redhat.com>
Cc: Jason Wang <jasowang at redhat.com>
Cc: Pankaj Gupta <pankaj.gupta.linux at gmail.com>
Cc: Wei Yang <richard.weiyang at linux.alibaba.com>
Cc: Michal Hocko <mhocko at kernel.org>
Cc: Dan Williams <dan.j.williams at intel.com>
Cc: Anshuman Khandual <anshuman.khandual at arm.com>
Cc: Dave Hansen <dave.hansen at linux.intel.com>
Cc: Vlastimil Babka <vbabka at suse.cz>
Cc: Mike Rapoport <rppt at kernel.org>
Cc: "Rafael J. Wysocki" <rjw at rjwysocki.net>
Cc: Len Brown <lenb at kernel.org>
Cc: Pavel Tatashin <pasha.tatashin at soleen.com>
Cc: Heiko Carstens <hca at linux.ibm.com>
Cc: Michael Ellerman <mpe at ellerman.id.au>
Cc: Catalin Marinas <catalin.marinas at arm.com>
Cc: virtualization at lists.linux-foundation.org
Cc: Andy Lutomirski <luto at kernel.org>
Cc: "Aneesh Kumar K.V" <aneesh.kumar at linux.ibm.com>
Cc: Anton Blanchard <anton at ozlabs.org>
Cc: Ard Biesheuvel <ardb at kernel.org>
Cc: Baoquan He <bhe at redhat.com>
Cc: Benjamin Herrenschmidt <benh at kernel.crashing.org>
Cc: Borislav Petkov <bp at alien8.de>
Cc: Christian Borntraeger <borntraeger at de.ibm.com>
Cc: Christophe Leroy <christophe.leroy at c-s.fr>
Cc: Dave Jiang <dave.jiang at intel.com>
Cc: "H. Peter Anvin" <hpa at zytor.com>
Cc: Ingo Molnar <mingo at redhat.com>
Cc: Jia He <justin.he at arm.com>
Cc: Joe Perches <joe at perches.com>
Cc: Kefeng Wang <wangkefeng.wang at huawei.com>
Cc: Laurent Dufour <ldufour at linux.ibm.com>
Cc: Michel Lespinasse <michel at lespinasse.org>
Cc: Nathan Lynch <nathanl at linux.ibm.com>
Cc: Nicholas Piggin <npiggin at gmail.com>
Cc: Paul Mackerras <paulus at samba.org>
Cc: Peter Zijlstra <peterz at infradead.org>
Cc: Pierre Morel <pmorel at linux.ibm.com>
Cc: "Rafael J. Wysocki" <rafael.j.wysocki at intel.com>
Cc: Rich Felker <dalias at libc.org>
Cc: Scott Cheloha <cheloha at linux.ibm.com>
Cc: Sergei Trofimovich <slyfox at gentoo.org>
Cc: Thiago Jung Bauermann <bauerman at linux.ibm.com>
Cc: Thomas Gleixner <tglx at linutronix.de>
Cc: Vasily Gorbik <gor at linux.ibm.com>
Cc: Vishal Verma <vishal.l.verma at intel.com>
Cc: Will Deacon <will at kernel.org>
Cc: Yoshinori Sato <ysato at users.sourceforge.jp>
Cc: <stable at vger.kernel.org>
Signed-off-by: Andrew Morton <akpm at linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds at linux-foundation.org>
Signed-off-by: David Hildenbrand <david at redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh at linuxfoundation.org>
---
 include/linux/memory_hotplug.h |    4 ++--
 mm/memory_hotplug.c            |    4 ++--
 2 files changed, 4 insertions(+), 4 deletions(-)

--- a/include/linux/memory_hotplug.h
+++ b/include/linux/memory_hotplug.h
@@ -358,6 +358,6 @@ extern struct page *sparse_decode_mem_ma
 					  unsigned long pnum);
 extern bool allow_online_pfn_range(int nid, unsigned long pfn, unsigned long
nr_pages,
 		int online_type);
-extern struct zone *zone_for_pfn_range(int online_type, int nid, unsigned
start_pfn,
-		unsigned long nr_pages);
+extern struct zone *zone_for_pfn_range(int online_type, int nid,
+		unsigned long start_pfn, unsigned long nr_pages);
 #endif /* __LINUX_MEMORY_HOTPLUG_H */
--- a/mm/memory_hotplug.c
+++ b/mm/memory_hotplug.c
@@ -775,8 +775,8 @@ static inline struct zone *default_zone_
 	return movable_node_enabled ? movable_zone : kernel_zone;
 }
 
-struct zone * zone_for_pfn_range(int online_type, int nid, unsigned start_pfn,
-		unsigned long nr_pages)
+struct zone *zone_for_pfn_range(int online_type, int nid,
+		unsigned long start_pfn, unsigned long nr_pages)
 {
 	if (online_type == MMOP_ONLINE_KERNEL)
 		return default_kernel_zone_for_pfn(nid, start_pfn, nr_pages);


Patches currently in stable-queue which might be from david at redhat.com are

queue-5.4/x86-mm-fix-kern_addr_valid-to-cope-with-existing-but-not-present-entries.patch
queue-5.4/mm-memory_hotplug-use-unsigned-long-for-pfn-in-zone_for_pfn_range.patch
Linux Virtualization - Sep 2021 - Patch "mm/memory_hotplug: use "unsigned long" for PFN in zone_for_pfn_range()" has been added to the 5.4-stable tree

Patch "mm/memory_hotplug: use "unsigned long" for PFN in zone_for_pfn_range()" has been added to the 5.4-stable tree
