• David Hildenbrand's avatar
    mm/memory_hotplug: restrict CONFIG_MEMORY_HOTPLUG to 64 bit · 7ec58a2b
    David Hildenbrand authored
    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 b59d02ed ("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.
    
    Link: https://lkml.kernel.org/r/20210929143600.49379-4-david@redhat.comSigned-off-by: default avatarDavid Hildenbrand <david@redhat.com>
    Reviewed-by: default avatarOscar Salvador <osalvador@suse.de>
    Cc: Alex Shi <alexs@kernel.org>
    Cc: Andy Lutomirski <luto@kernel.org>
    Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
    Cc: Borislav Petkov <bp@alien8.de>
    Cc: Dave Hansen <dave.hansen@linux.intel.com>
    Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
    Cc: "H. Peter Anvin" <hpa@zytor.com>
    Cc: Ingo Molnar <mingo@redhat.com>
    Cc: Jason Wang <jasowang@redhat.com>
    Cc: Jonathan Corbet <corbet@lwn.net>
    Cc: Michael Ellerman <mpe@ellerman.id.au>
    Cc: "Michael S. Tsirkin" <mst@redhat.com>
    Cc: Michal Hocko <mhocko@suse.com>
    Cc: Mike Rapoport <rppt@kernel.org>
    Cc: Paul Mackerras <paulus@samba.org>
    Cc: Peter Zijlstra <peterz@infradead.org>
    Cc: "Rafael J. Wysocki" <rafael@kernel.org>
    Cc: Shuah Khan <shuah@kernel.org>
    Cc: Thomas Gleixner <tglx@linutronix.de>
    Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
    Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
    7ec58a2b
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