Messages in this thread | | | Subject | Re: [PATCH v1 2/7] s390x/mm: Implement arch_remove_memory() | From | David Hildenbrand <> | Date | Fri, 26 Apr 2019 11:11:24 +0200 |
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On 24.04.19 12:25, David Hildenbrand wrote: > Will come in handy when wanting to handle errors after > arch_add_memory(). > > Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> > Cc: Heiko Carstens <heiko.carstens@de.ibm.com> > Cc: Andrew Morton <akpm@linux-foundation.org> > Cc: Michal Hocko <mhocko@suse.com> > Cc: Mike Rapoport <rppt@linux.vnet.ibm.com> > Cc: David Hildenbrand <david@redhat.com> > Cc: Vasily Gorbik <gor@linux.ibm.com> > Cc: Oscar Salvador <osalvador@suse.com> > Signed-off-by: David Hildenbrand <david@redhat.com> > --- > arch/s390/mm/init.c | 13 +++++++------ > 1 file changed, 7 insertions(+), 6 deletions(-) > > diff --git a/arch/s390/mm/init.c b/arch/s390/mm/init.c > index 31b1071315d7..2636d62df04e 100644 > --- a/arch/s390/mm/init.c > +++ b/arch/s390/mm/init.c > @@ -237,12 +237,13 @@ int arch_add_memory(int nid, u64 start, u64 size, > void arch_remove_memory(int nid, u64 start, u64 size, > struct vmem_altmap *altmap) > { > - /* > - * There is no hardware or firmware interface which could trigger a > - * hot memory remove on s390. So there is nothing that needs to be > - * implemented. > - */ > - BUG(); > + unsigned long start_pfn = start >> PAGE_SHIFT; > + unsigned long nr_pages = size >> PAGE_SHIFT; > + struct zone *zone; > + > + vmem_remove_mapping(start, size); > + zone = page_zone(pfn_to_page(start_pfn)); > + __remove_pages(zone, start_pfn, nr_pages, altmap);
I guess the correct way is to remove the mapping after __remove_pages. But as the pages should not be touched by anybody, it shouldn't really matter. Will change when I resend.
> } > #endif > #endif /* CONFIG_MEMORY_HOTPLUG */ >
--
Thanks,
David / dhildenb
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