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From:   Andrea Arcangeli <aarcange@redhat.com>
To:     Will Deacon <will@kernel.org>,
        Catalin Marinas <catalin.marinas@arm.com>,
        Rafael Aquini <aquini@redhat.com>,
        Mark Salter <msalter@redhat.com>
Cc:     Jon Masters <jcm@jonmasters.org>, linux-kernel@vger.kernel.org,
        linux-mm@kvack.org, linux-arm-kernel@lists.infradead.org,
        Michal Hocko <mhocko@kernel.org>, QI Fuli <qi.fuli@fujitsu.com>
Subject: [PATCH 2/3] arm64: select CPUMASK_OFFSTACK if NUMA
Date:   Sun, 23 Feb 2020 14:25:19 -0500
Message-Id: <20200223192520.20808-3-aarcange@redhat.com>
In-Reply-To: <20200223192520.20808-1-aarcange@redhat.com>
References: <20200223192520.20808-1-aarcange@redhat.com>
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It's unclear why normally CPUMASK_OFFSTACK can only be manually
configured "if DEBUG_PER_CPU_MAPS" which is not an option meant to be
enabled on enterprise arm64 kernels.

The default enterprise kernels NR_CPUS is 4096 which is fairly large.
So it'll save some RAM and it'll increase reliability to select
CPUMASK_OFFSET at least when NUMA is selected and a large NR_CPUS is
to be expected.

Signed-off-by: Andrea Arcangeli <aarcange@redhat.com>
---
 arch/arm64/Kconfig | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index 0b30e884e088..882887e65394 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -955,6 +955,7 @@ config NUMA
 	bool "Numa Memory Allocation and Scheduler Support"
 	select ACPI_NUMA if ACPI
 	select OF_NUMA
+	select CPUMASK_OFFSTACK
 	help
 	  Enable NUMA (Non Uniform Memory Access) support.
=20