From: Oscar Salvador <osalvador@suse.de>
To: David Hildenbrand <david@redhat.com>
Cc: linux-kernel@vger.kernel.org,
Andrew Morton <akpm@linux-foundation.org>,
Jonathan Corbet <corbet@lwn.net>, Alex Shi <alexs@kernel.org>,
Michael Ellerman <mpe@ellerman.id.au>,
Benjamin Herrenschmidt <benh@kernel.crashing.org>,
Paul Mackerras <paulus@samba.org>,
Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
"H. Peter Anvin" <hpa@zytor.com>,
Dave Hansen <dave.hansen@linux.intel.com>,
Andy Lutomirski <luto@kernel.org>,
Peter Zijlstra <peterz@infradead.org>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
"Rafael J. Wysocki" <rafael@kernel.org>,
"Michael S. Tsirkin" <mst@redhat.com>,
Jason Wang <jasowang@redhat.com>, Shuah Khan <shuah@kernel.org>,
Michal Hocko <mhocko@suse.com>, Mike Rapoport <rppt@kernel.org>,
x86@kernel.org, linux-mm@kvack.org,
linux-kselftest@vger.kernel.org, linux-doc@vger.kernel.org,
linuxppc-dev@lists.ozlabs.org,
virtualization@lists.linux-foundation.org
Subject: Re: [PATCH v1 3/6] mm/memory_hotplug: restrict CONFIG_MEMORY_HOTPLUG to 64 bit
Date: Thu, 7 Oct 2021 11:02:11 +0200 [thread overview]
Message-ID: <YV63kyvrxt0tx/Ru@localhost.localdomain> (raw)
In-Reply-To: <20210929143600.49379-4-david@redhat.com>
On Wed, Sep 29, 2021 at 04:35:57PM +0200, David Hildenbrand wrote:
> 32 bit support is broken in various ways: for example, we can online
> memory that should actually go to ZONE_HIGHMEM to ZONE_MOVABLE or in
> some cases even to one of the other kernel zones.
>
> We marked it BROKEN in commit b59d02ed0869 ("mm/memory_hotplug: disable the
> functionality for 32b") almost one year ago. According to that commit
> it might be broken at least since 2017. Further, there is hardly a sane use
> case nowadays.
>
> Let's just depend completely on 64bit, dropping the "BROKEN" dependency to
> make clear that we are not going to support it again. Next, we'll remove
> some HIGHMEM leftovers from memory hotplug code to clean up.
>
> Signed-off-by: David Hildenbrand <david@redhat.com>
Reviewed-by: Oscar Salvador <osalvador@suse.de>
> ---
> mm/Kconfig | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/mm/Kconfig b/mm/Kconfig
> index ea8762cd8e1e..88273dd5c6d6 100644
> --- a/mm/Kconfig
> +++ b/mm/Kconfig
> @@ -125,7 +125,7 @@ config MEMORY_HOTPLUG
> select MEMORY_ISOLATION
> depends on SPARSEMEM
> depends on ARCH_ENABLE_MEMORY_HOTPLUG
> - depends on 64BIT || BROKEN
> + depends on 64BIT
> select NUMA_KEEP_MEMINFO if NUMA
>
> config MEMORY_HOTPLUG_DEFAULT_ONLINE
> --
> 2.31.1
>
>
--
Oscar Salvador
SUSE Labs
next prev parent reply other threads:[~2021-10-07 9:02 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-09-29 14:35 [PATCH v1 0/6] mm/memory_hotplug: Kconfig and 32 bit cleanups David Hildenbrand
2021-09-29 14:35 ` [PATCH v1 1/6] mm/memory_hotplug: remove CONFIG_X86_64_ACPI_NUMA dependency from CONFIG_MEMORY_HOTPLUG David Hildenbrand
2021-10-07 8:09 ` Oscar Salvador
2021-09-29 14:35 ` [PATCH v1 2/6] mm/memory_hotplug: remove CONFIG_MEMORY_HOTPLUG_SPARSE David Hildenbrand
2021-10-05 13:43 ` Greg Kroah-Hartman
2021-10-05 14:22 ` Shuah Khan
2021-10-07 8:20 ` Oscar Salvador
2021-09-29 14:35 ` [PATCH v1 3/6] mm/memory_hotplug: restrict CONFIG_MEMORY_HOTPLUG to 64 bit David Hildenbrand
2021-10-07 9:02 ` Oscar Salvador [this message]
2021-09-29 14:35 ` [PATCH v1 4/6] mm/memory_hotplug: remove HIGHMEM leftovers David Hildenbrand
2021-10-07 9:13 ` Oscar Salvador
2021-09-29 14:35 ` [PATCH v1 5/6] mm/memory_hotplug: remove stale function declarations David Hildenbrand
2021-10-07 9:14 ` Oscar Salvador
2021-09-29 14:36 ` [PATCH v1 6/6] x86: remove memory hotplug support on X86_32 David Hildenbrand
2021-10-07 9:15 ` Oscar Salvador
2021-10-07 9:27 ` David Hildenbrand
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