[PATCH 2/2] arm64: mm: enable CONFIG_HOLES_IN_ZONE for NUMA
From: Will Deacon <hidden>
Date: 2017-01-04 13:28:36
Also in:
linux-mm, lkml
On Wed, Dec 14, 2016 at 09:11:47AM +0000, Ard Biesheuvel wrote:
quoted hunk ↗ jump to hunk
The NUMA code may get confused by the presence of NOMAP regions within zones, resulting in spurious BUG() checks where the node id deviates from the containing zone's node id. Since the kernel has no business reasoning about node ids of pages it does not own in the first place, enable CONFIG_HOLES_IN_ZONE to ensure that such pages are disregarded. Signed-off-by: Ard Biesheuvel <redacted> --- arch/arm64/Kconfig | 4 ++++ 1 file changed, 4 insertions(+)diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig index 111742126897..0472afe64d55 100644 --- a/arch/arm64/Kconfig +++ b/arch/arm64/Kconfig@@ -614,6 +614,10 @@ config NEED_PER_CPU_EMBED_FIRST_CHUNK def_bool y depends on NUMA +config HOLES_IN_ZONE + def_bool y + depends on NUMA + source kernel/Kconfig.preempt source kernel/Kconfig.hz
I'm happy to apply this, but I'll hold off until the first patch is queued somewhere, since this doesn't help without the VM_BUG_ON being moved. Alternatively, I can queue both if somebody from the mm camp acks the first patch. Will