From patchwork Mon Oct 17 14:56:49 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Subject: [v2] arm64: kernel: numa: fix ACPI boot cpu numa node mapping From: Lorenzo Pieralisi X-Patchwork-Id: 9379531 Message-Id: <20161017145649.6189-1-lorenzo.pieralisi@arm.com> To: linux-arm-kernel@lists.infradead.org Cc: Andrew Jones , Lorenzo Pieralisi , Catalin Marinas , Will Deacon , linux-kernel@vger.kernel.org, linux-acpi@vger.kernel.org, Hanjun Guo , Zhen Lei , Laszlo Ersek Date: Mon, 17 Oct 2016 15:56:49 +0100 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 owing to missing cpu<->node 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 Tested-by: Laszlo Ersek Reported-by: Laszlo Ersek Cc: Will Deacon Cc: Laszlo Ersek Cc: Hanjun Guo Cc: Andrew Jones Cc: Zhen Lei Cc: Catalin Marinas Acked-by: Hanjun Guo --- v1 -> v2 - Updated commit log to reflect boot failures set-ups 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; }