lkml.org 
[lkml]   [2020]   [Jan]   [28]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH 4.19 77/92] mm/memory_hotplug: make unregister_memory_section() never fail
Date
From: David Hildenbrand <david@redhat.com>

commit cb7b3a3685b20d3b5900ff24b2cb96d002960189 upstream.

Failing while removing memory is mostly ignored and cannot really be
handled. Let's treat errors in unregister_memory_section() in a nice way,
warning, but continuing.

Link: http://lkml.kernel.org/r/20190409100148.24703-3-david@redhat.com
Signed-off-by: David Hildenbrand <david@redhat.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: "Rafael J. Wysocki" <rafael@kernel.org>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Andrew Banman <andrew.banman@hpe.com>
Cc: Mike Travis <mike.travis@hpe.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: Oscar Salvador <osalvador@suse.de>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Pavel Tatashin <pasha.tatashin@soleen.com>
Cc: Qian Cai <cai@lca.pw>
Cc: Wei Yang <richard.weiyang@gmail.com>
Cc: Arun KS <arunks@codeaurora.org>
Cc: Mathieu Malaterre <malat@debian.org>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Christophe Leroy <christophe.leroy@c-s.fr>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Fenghua Yu <fenghua.yu@intel.com>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Cc: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Masahiro Yamada <yamada.masahiro@socionext.com>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Mike Rapoport <rppt@linux.ibm.com>
Cc: Nicholas Piggin <npiggin@gmail.com>
Cc: Oscar Salvador <osalvador@suse.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Rich Felker <dalias@libc.org>
Cc: Rob Herring <robh@kernel.org>
Cc: Stefan Agner <stefan@agner.ch>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Tony Luck <tony.luck@intel.com>
Cc: Vasily Gorbik <gor@linux.ibm.com>
Cc: Yoshinori Sato <ysato@users.sourceforge.jp>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: David Hildenbrand <david@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/base/memory.c | 16 +++++-----------
include/linux/memory.h | 2 +-
mm/memory_hotplug.c | 4 +---
3 files changed, 7 insertions(+), 15 deletions(-)

--- a/drivers/base/memory.c
+++ b/drivers/base/memory.c
@@ -743,15 +743,18 @@ unregister_memory(struct memory_block *m
{
BUG_ON(memory->dev.bus != &memory_subsys);

- /* drop the ref. we got in remove_memory_section() */
+ /* drop the ref. we got via find_memory_block() */
put_device(&memory->dev);
device_unregister(&memory->dev);
}

-static int remove_memory_section(struct mem_section *section)
+void unregister_memory_section(struct mem_section *section)
{
struct memory_block *mem;

+ if (WARN_ON_ONCE(!present_section(section)))
+ return;
+
mutex_lock(&mem_sysfs_mutex);

/*
@@ -772,15 +775,6 @@ static int remove_memory_section(struct

out_unlock:
mutex_unlock(&mem_sysfs_mutex);
- return 0;
-}
-
-int unregister_memory_section(struct mem_section *section)
-{
- if (!present_section(section))
- return -EINVAL;
-
- return remove_memory_section(section);
}
#endif /* CONFIG_MEMORY_HOTREMOVE */

--- a/include/linux/memory.h
+++ b/include/linux/memory.h
@@ -113,7 +113,7 @@ extern int register_memory_isolate_notif
extern void unregister_memory_isolate_notifier(struct notifier_block *nb);
int hotplug_memory_register(int nid, struct mem_section *section);
#ifdef CONFIG_MEMORY_HOTREMOVE
-extern int unregister_memory_section(struct mem_section *);
+extern void unregister_memory_section(struct mem_section *);
#endif
extern int memory_dev_init(void);
extern int memory_notify(unsigned long val, void *v);
--- a/mm/memory_hotplug.c
+++ b/mm/memory_hotplug.c
@@ -488,9 +488,7 @@ static int __remove_section(struct zone
if (!valid_section(ms))
return ret;

- ret = unregister_memory_section(ms);
- if (ret)
- return ret;
+ unregister_memory_section(ms);

scn_nr = __section_nr(ms);
start_pfn = section_nr_to_pfn((unsigned long)scn_nr);

\
 
 \ /
  Last update: 2020-01-28 15:29    [W:0.274 / U:0.008 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site