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Message-Id: <20200128135819.450509917@linuxfoundation.org>
Date: Tue, 28 Jan 2020 15:08:46 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
David Hildenbrand <david@...hat.com>,
Oscar Salvador <osalvador@...e.de>,
Michal Hocko <mhocko@...e.com>,
Pavel Tatashin <pasha.tatashin@...een.com>,
Qian Cai <cai@....pw>, Wei Yang <richard.weiyang@...il.com>,
Arun KS <arunks@...eaurora.org>,
Mathieu Malaterre <malat@...ian.org>,
Andrew Banman <andrew.banman@....com>,
Andy Lutomirski <luto@...nel.org>,
Benjamin Herrenschmidt <benh@...nel.crashing.org>,
Borislav Petkov <bp@...en8.de>,
Christophe Leroy <christophe.leroy@....fr>,
Dave Hansen <dave.hansen@...ux.intel.com>,
Fenghua Yu <fenghua.yu@...el.com>,
Geert Uytterhoeven <geert@...ux-m68k.org>,
Heiko Carstens <heiko.carstens@...ibm.com>,
"H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...nel.org>,
Ingo Molnar <mingo@...hat.com>,
Joonsoo Kim <iamjoonsoo.kim@....com>,
"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
Martin Schwidefsky <schwidefsky@...ibm.com>,
Masahiro Yamada <yamada.masahiro@...ionext.com>,
Michael Ellerman <mpe@...erman.id.au>,
Mike Rapoport <rppt@...ux.ibm.com>,
Mike Travis <mike.travis@....com>,
Nicholas Piggin <npiggin@...il.com>,
Oscar Salvador <osalvador@...e.com>,
Paul Mackerras <paulus@...ba.org>,
Peter Zijlstra <peterz@...radead.org>,
"Rafael J. Wysocki" <rafael@...nel.org>,
Rich Felker <dalias@...c.org>, Rob Herring <robh@...nel.org>,
Stefan Agner <stefan@...er.ch>,
Thomas Gleixner <tglx@...utronix.de>,
Tony Luck <tony.luck@...el.com>,
Vasily Gorbik <gor@...ux.ibm.com>,
Yoshinori Sato <ysato@...rs.sourceforge.jp>,
Andrew Morton <akpm@...ux-foundation.org>,
Linus Torvalds <torvalds@...ux-foundation.org>
Subject: [PATCH 4.19 78/92] mm/memory_hotplug: make __remove_section() never fail
From: David Hildenbrand <david@...hat.com>
commit 9d1d887d785b4fe0590bd3c5e71acaa3908044e2 upstream.
Let's just warn in case a section is not valid instead of failing to
remove somewhere in the middle of the process, returning an error that
will be mostly ignored by callers.
Link: http://lkml.kernel.org/r/20190409100148.24703-4-david@redhat.com
Signed-off-by: David Hildenbrand <david@...hat.com>
Reviewed-by: Oscar Salvador <osalvador@...e.de>
Cc: Michal Hocko <mhocko@...e.com>
Cc: David Hildenbrand <david@...hat.com>
Cc: Pavel Tatashin <pasha.tatashin@...een.com>
Cc: Qian Cai <cai@....pw>
Cc: Wei Yang <richard.weiyang@...il.com>
Cc: Arun KS <arunks@...eaurora.org>
Cc: Mathieu Malaterre <malat@...ian.org>
Cc: Andrew Banman <andrew.banman@....com>
Cc: Andy Lutomirski <luto@...nel.org>
Cc: Benjamin Herrenschmidt <benh@...nel.crashing.org>
Cc: Borislav Petkov <bp@...en8.de>
Cc: Christophe Leroy <christophe.leroy@....fr>
Cc: Dave Hansen <dave.hansen@...ux.intel.com>
Cc: Fenghua Yu <fenghua.yu@...el.com>
Cc: Geert Uytterhoeven <geert@...ux-m68k.org>
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: Heiko Carstens <heiko.carstens@...ibm.com>
Cc: "H. Peter Anvin" <hpa@...or.com>
Cc: Ingo Molnar <mingo@...nel.org>
Cc: Ingo Molnar <mingo@...hat.com>
Cc: Joonsoo Kim <iamjoonsoo.kim@....com>
Cc: "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
Cc: Martin Schwidefsky <schwidefsky@...ibm.com>
Cc: Masahiro Yamada <yamada.masahiro@...ionext.com>
Cc: Michael Ellerman <mpe@...erman.id.au>
Cc: Mike Rapoport <rppt@...ux.ibm.com>
Cc: Mike Travis <mike.travis@....com>
Cc: Nicholas Piggin <npiggin@...il.com>
Cc: Oscar Salvador <osalvador@...e.com>
Cc: Paul Mackerras <paulus@...ba.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: "Rafael J. Wysocki" <rafael@...nel.org>
Cc: Rich Felker <dalias@...c.org>
Cc: Rob Herring <robh@...nel.org>
Cc: Stefan Agner <stefan@...er.ch>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Tony Luck <tony.luck@...el.com>
Cc: Vasily Gorbik <gor@...ux.ibm.com>
Cc: Yoshinori Sato <ysato@...rs.sourceforge.jp>
Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org>
Signed-off-by: David Hildenbrand <david@...hat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
mm/memory_hotplug.c | 22 +++++++++-------------
1 file changed, 9 insertions(+), 13 deletions(-)
--- a/mm/memory_hotplug.c
+++ b/mm/memory_hotplug.c
@@ -478,15 +478,15 @@ static void __remove_zone(struct zone *z
pgdat_resize_unlock(zone->zone_pgdat, &flags);
}
-static int __remove_section(struct zone *zone, struct mem_section *ms,
- unsigned long map_offset, struct vmem_altmap *altmap)
+static void __remove_section(struct zone *zone, struct mem_section *ms,
+ unsigned long map_offset,
+ struct vmem_altmap *altmap)
{
unsigned long start_pfn;
int scn_nr;
- int ret = -EINVAL;
- if (!valid_section(ms))
- return ret;
+ if (WARN_ON_ONCE(!valid_section(ms)))
+ return;
unregister_memory_section(ms);
@@ -495,7 +495,6 @@ static int __remove_section(struct zone
__remove_zone(zone, start_pfn);
sparse_remove_one_section(zone, ms, map_offset, altmap);
- return 0;
}
/**
@@ -515,7 +514,7 @@ int __remove_pages(struct zone *zone, un
{
unsigned long i;
unsigned long map_offset = 0;
- int sections_to_remove, ret = 0;
+ int sections_to_remove;
/* In the ZONE_DEVICE case device driver owns the memory region */
if (is_dev_zone(zone)) {
@@ -536,16 +535,13 @@ int __remove_pages(struct zone *zone, un
unsigned long pfn = phys_start_pfn + i*PAGES_PER_SECTION;
cond_resched();
- ret = __remove_section(zone, __pfn_to_section(pfn), map_offset,
- altmap);
+ __remove_section(zone, __pfn_to_section(pfn), map_offset,
+ altmap);
map_offset = 0;
- if (ret)
- break;
}
set_zone_contiguous(zone);
-
- return ret;
+ return 0;
}
#endif /* CONFIG_MEMORY_HOTREMOVE */
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