From: Michal Hocko <mhocko@kernel.org>
To: David Hildenbrand <david@redhat.com>
Cc: Oscar Salvador <osalvador@suse.com>,
linux-s390@vger.kernel.org, linux-ia64@vger.kernel.org,
Vasily Gorbik <gor@linux.ibm.com>,
linux-sh@vger.kernel.org,
Heiko Carstens <heiko.carstens@de.ibm.com>,
linux-kernel@vger.kernel.org,
Wei Yang <richard.weiyang@gmail.com>,
linux-mm@kvack.org, Mike Rapoport <rppt@linux.vnet.ibm.com>,
Martin Schwidefsky <schwidefsky@de.ibm.com>,
Igor Mammedov <imammedo@redhat.com>,
akpm@linux-foundation.org, linuxppc-dev@lists.ozlabs.org,
Dan Williams <dan.j.williams@intel.com>,
linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH v3 03/11] s390x/mm: Implement arch_remove_memory()
Date: Mon, 1 Jul 2019 14:47:17 +0200 [thread overview]
Message-ID: <20190701124717.GU6376@dhcp22.suse.cz> (raw)
In-Reply-To: <20190701074503.GD6376@dhcp22.suse.cz>
On Mon 01-07-19 09:45:03, Michal Hocko wrote:
> On Mon 27-05-19 13:11:44, David Hildenbrand wrote:
> > Will come in handy when wanting to handle errors after
> > arch_add_memory().
>
> I do not understand this. Why do you add a code for something that is
> not possible on this HW (based on the comment - is it still valid btw?)
Same as the previous patch (drop it).
> > 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 d552e330fbcc..14955e0a9fcf 100644
> > --- a/arch/s390/mm/init.c
> > +++ b/arch/s390/mm/init.c
> > @@ -243,12 +243,13 @@ 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;
> > +
> > + zone = page_zone(pfn_to_page(start_pfn));
> > + __remove_pages(zone, start_pfn, nr_pages, altmap);
> > + vmem_remove_mapping(start, size);
> > }
> > #endif
> > #endif /* CONFIG_MEMORY_HOTPLUG */
> > --
> > 2.20.1
> >
>
> --
> Michal Hocko
> SUSE Labs
--
Michal Hocko
SUSE Labs
next prev parent reply other threads:[~2019-07-01 12:52 UTC|newest]
Thread overview: 68+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-05-27 11:11 [PATCH v3 00/11] mm/memory_hotplug: Factor out memory block devicehandling David Hildenbrand
2019-05-27 11:11 ` [PATCH v3 01/11] mm/memory_hotplug: Simplify and fix check_hotplug_memory_range() David Hildenbrand
2019-05-30 17:53 ` Pavel Tatashin
2019-06-10 16:46 ` Oscar Salvador
2019-07-01 7:42 ` Michal Hocko
2019-05-27 11:11 ` [PATCH v3 02/11] s390x/mm: Fail when an altmap is used for arch_add_memory() David Hildenbrand
2019-06-10 17:07 ` Oscar Salvador
2019-07-01 7:43 ` Michal Hocko
2019-07-01 12:46 ` Michal Hocko
2019-07-15 10:51 ` David Hildenbrand
2019-07-19 6:45 ` Michal Hocko
2019-05-27 11:11 ` [PATCH v3 03/11] s390x/mm: Implement arch_remove_memory() David Hildenbrand
2019-07-01 7:45 ` Michal Hocko
2019-07-01 12:47 ` Michal Hocko [this message]
2019-07-15 10:45 ` David Hildenbrand
2019-05-27 11:11 ` [PATCH v3 04/11] arm64/mm: Add temporary arch_remove_memory() implementation David Hildenbrand
2019-06-03 21:41 ` Wei Yang
2019-06-04 6:56 ` David Hildenbrand
2019-06-04 17:36 ` Robin Murphy
2019-06-04 17:51 ` David Hildenbrand
2019-07-01 12:48 ` Michal Hocko
2019-05-27 11:11 ` [PATCH v3 05/11] drivers/base/memory: Pass a block_id to init_memory_block() David Hildenbrand
2019-06-03 21:49 ` Wei Yang
2019-06-04 6:56 ` David Hildenbrand
2019-07-01 7:56 ` Michal Hocko
2019-05-27 11:11 ` [PATCH v3 06/11] mm/memory_hotplug: Allow arch_remove_pages() without CONFIG_MEMORY_HOTREMOVE David Hildenbrand
2019-05-30 17:56 ` Pavel Tatashin
2019-06-03 22:15 ` Wei Yang
2019-06-04 6:59 ` David Hildenbrand
2019-06-04 8:31 ` Wei Yang
2019-06-04 9:00 ` David Hildenbrand
2019-07-01 8:01 ` Michal Hocko
2019-07-01 12:51 ` Michal Hocko
2019-07-15 10:54 ` David Hildenbrand
2019-07-19 6:06 ` Michal Hocko
2019-05-27 11:11 ` [PATCH v3 07/11] mm/memory_hotplug: Create memory block devices after arch_add_memory() David Hildenbrand
2019-05-30 21:07 ` Pavel Tatashin
2019-06-04 21:42 ` Wei Yang
2019-06-05 8:58 ` David Hildenbrand
2019-06-05 10:58 ` David Hildenbrand
2019-06-05 21:22 ` Wei Yang
2019-06-05 21:50 ` David Hildenbrand
2019-07-01 8:14 ` Michal Hocko
2019-05-27 11:11 ` [PATCH v3 08/11] mm/memory_hotplug: Drop MHP_MEMBLOCK_API David Hildenbrand
2019-06-04 21:47 ` Wei Yang
2019-07-01 8:15 ` Michal Hocko
2019-05-27 11:11 ` [PATCH v3 09/11] mm/memory_hotplug: Remove memory block devices before arch_remove_memory() David Hildenbrand
2019-06-04 22:07 ` Wei Yang
2019-06-05 9:00 ` David Hildenbrand
2019-07-01 8:41 ` Michal Hocko
2019-07-15 10:58 ` David Hildenbrand
2019-05-27 11:11 ` [PATCH v3 10/11] mm/memory_hotplug: Make unregister_memory_block_under_nodes() never fail David Hildenbrand
2019-06-05 21:21 ` Wei Yang
2019-06-10 16:56 ` Oscar Salvador
2019-07-01 8:51 ` Michal Hocko
2019-07-01 9:36 ` Oscar Salvador
2019-07-01 10:27 ` Michal Hocko
2019-07-15 11:10 ` David Hildenbrand
2019-07-16 8:46 ` Oscar Salvador
2019-07-16 11:08 ` David Hildenbrand
2019-07-16 11:09 ` David Hildenbrand
2019-07-19 6:05 ` Michal Hocko
2019-05-27 11:11 ` [PATCH v3 11/11] mm/memory_hotplug: Remove "zone" parameter from sparse_remove_one_section David Hildenbrand
2019-06-05 21:21 ` Wei Yang
2019-06-10 16:58 ` Oscar Salvador
2019-07-01 8:52 ` Michal Hocko
2019-06-03 21:21 ` [PATCH v3 00/11] mm/memory_hotplug: Factor out memory block devicehandling Wei Yang
2019-06-03 21:40 ` David Hildenbrand
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