linux-kernel - [PATCH 2/3] arm64: select CPUMASK

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:   Sun, 23 Feb 2020 14:25:19 -0500
From:   Andrea Arcangeli <aarcange@...hat.com>
To:     Will Deacon <will@...nel.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Rafael Aquini <aquini@...hat.com>,
        Mark Salter <msalter@...hat.com>
Cc:     Jon Masters <jcm@...masters.org>, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org, linux-arm-kernel@...ts.infradead.org,
        Michal Hocko <mhocko@...nel.org>, QI Fuli <qi.fuli@...itsu.com>
Subject: [PATCH 2/3] arm64: select CPUMASK_OFFSTACK if NUMA

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@...hat.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.