linux-kernel - [PATCH] arm64: kernel: numa: fix ACPI boot cpu numa node mapping

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Message-Id: <20161017141848.5274-1-lorenzo.pieralisi@arm.com>
Date:   Mon, 17 Oct 2016 15:18:48 +0100
From:   Lorenzo Pieralisi <lorenzo.pieralisi@....com>
To:     linux-arm-kernel@...ts.infradead.org
Cc:     linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Will Deacon <will.deacon@....com>,
        Laszlo Ersek <lersek@...hat.com>,
        Hanjun Guo <hanjun.guo@...aro.org>,
        Andrew Jones <drjones@...hat.com>,
        Zhen Lei <thunder.leizhen@...wei.com>,
        Catalin Marinas <catalin.marinas@....com>
Subject: [PATCH] arm64: kernel: numa: fix ACPI boot cpu numa node mapping

Commit 7ba5f605f3a0 ("arm64/numa: remove the limitation that cpu0 must
bind to node0") removed the numa cpu<->node mapping restriction whereby
logical cpu 0 always corresponds to numa node 0; removing the
restriction was correct, in that it does not really exist in practice
but the commit only updated the early mapping of logical cpu 0 to its
real numa node for the DT boot path, missing the ACPI one, leading to
boot failures on ACPI systems with numa enabled owing to missing
node<->cpu map for logical cpu 0.

Fix the issue by updating the ACPI boot path with code that carries out
the early cpu<->node mapping also for the boot cpu (ie cpu 0), mirroring
what is currently done in the DT boot path.

Fixes: 7ba5f605f3a0 ("arm64/numa: remove the limitation that cpu0 must bind to node0")
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@....com>
Tested-by: Laszlo Ersek <lersek@...hat.com>
Reported-by: Laszlo Ersek <lersek@...hat.com>
Cc: Will Deacon <will.deacon@....com>
Cc: Laszlo Ersek <lersek@...hat.com>
Cc: Hanjun Guo <hanjun.guo@...aro.org>
Cc: Andrew Jones <drjones@...hat.com>
Cc: Zhen Lei <thunder.leizhen@...wei.com>
Cc: Catalin Marinas <catalin.marinas@....com>
---
 arch/arm64/kernel/smp.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/arm64/kernel/smp.c b/arch/arm64/kernel/smp.c
index d3f151c..8507703 100644
--- a/arch/arm64/kernel/smp.c
+++ b/arch/arm64/kernel/smp.c
@@ -544,6 +544,7 @@ acpi_map_gic_cpu_interface(struct acpi_madt_generic_interrupt *processor)
 			return;
 		}
 		bootcpu_valid = true;
+		early_map_cpu_to_node(0, acpi_numa_get_nid(0, hwid));
 		return;
 	}

-- 
2.10.0