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mm/memory_hotplug: make __remove_pages() and arch_remove_memory() never fail

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All callers of arch_remove_memory() ignore errors.  And we should really
try to remove any errors from the memory removal path.  No more errors are
reported from __remove_pages().  BUG() in s390x code in case
arch_remove_memory() is triggered.  We may implement that properly later.
WARN in case powerpc code failed to remove the section mapping, which is
better than ignoring the error completely right now.

Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: David Hildenbrand <[email protected]>
Cc: Tony Luck <[email protected]>
Cc: Fenghua Yu <[email protected]>
Cc: Benjamin Herrenschmidt <[email protected]>
Cc: Paul Mackerras <[email protected]>
Cc: Michael Ellerman <[email protected]>
Cc: Martin Schwidefsky <[email protected]>
Cc: Heiko Carstens <[email protected]>
Cc: Yoshinori Sato <[email protected]>
Cc: Rich Felker <[email protected]>
Cc: Dave Hansen <[email protected]>
Cc: Andy Lutomirski <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: Borislav Petkov <[email protected]>
Cc: "H. Peter Anvin" <[email protected]>
Cc: Michal Hocko <[email protected]>
Cc: Mike Rapoport <[email protected]>
Cc: Oscar Salvador <[email protected]>
Cc: "Kirill A. Shutemov" <[email protected]>
Cc: Christophe Leroy <[email protected]>
Cc: Stefan Agner <[email protected]>
Cc: Nicholas Piggin <[email protected]>
Cc: Pavel Tatashin <[email protected]>
Cc: Vasily Gorbik <[email protected]>
Cc: Arun KS <[email protected]>
Cc: Geert Uytterhoeven <[email protected]>
Cc: Masahiro Yamada <[email protected]>
Cc: Rob Herring <[email protected]>
Cc: Joonsoo Kim <[email protected]>
Cc: Wei Yang <[email protected]>
Cc: Qian Cai <[email protected]>
Cc: Mathieu Malaterre <[email protected]>
Cc: Andrew Banman <[email protected]>
Cc: Greg Kroah-Hartman <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: Mike Travis <[email protected]>
Cc: Oscar Salvador <[email protected]>
Cc: "Rafael J. Wysocki" <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
David Hildenbrand 2019-05-13 17:21:46 -07:00 • committed by Linus Torvalds
commit ac5c942645
8 changed files with 24 additions and 40 deletions
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5
mm/memory_hotplug.c
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@ -547,8 +547,8 @@ static void __remove_section(struct zone *zone, struct mem_section *ms,
* sure that pages are marked reserved and zones are adjust properly by
* calling offline_pages().
*/
int __remove_pages(struct zone *zone, unsigned long phys_start_pfn,
unsigned long nr_pages, struct vmem_altmap *altmap)
void __remove_pages(struct zone *zone, unsigned long phys_start_pfn,
unsigned long nr_pages, struct vmem_altmap *altmap)
{
unsigned long i;
unsigned long map_offset = 0;
@ -579,7 +579,6 @@ int __remove_pages(struct zone *zone, unsigned long phys_start_pfn,
}
set_zone_contiguous(zone);
return 0;
}
#endif /* CONFIG_MEMORY_HOTREMOVE */