The patch below does not apply to the 6.1-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to stable@vger.kernel.org.

To reproduce the conflict and resubmit, you may use the following commands:

git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-6.1.y git checkout FETCH_HEAD git cherry-pick -x 2d64eaeeeda5659d52da1af79d237269ba3c2d2c # <resolve conflicts, build, test, etc.> git commit -s git send-email --to 'stable@vger.kernel.org' --in-reply-to '2024070117-entire-chaperone-b7a4@gregkh' --subject-prefix 'PATCH 6.1.y' HEAD^..

Possible dependencies:

2d64eaeeeda5 ("irqchip/loongson-eiointc: Use early_cpu_to_node() instead of cpu_to_node()") 64cc451e45e1 ("irqchip/loongson-eiointc: Fix incorrect use of acpi_get_vec_parent") 3d12938dbc04 ("irqchip/loongarch: Adjust acpi_cascade_irqdomain_init() and sub-routines") a90335c2dfb4 ("irqchip/loongson-eiointc: Add suspend/resume support")

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From 2d64eaeeeda5659d52da1af79d237269ba3c2d2c Mon Sep 17 00:00:00 2001 From: Huacai Chen chenhuacai@kernel.org Date: Sun, 23 Jun 2024 11:41:13 +0800 Subject: [PATCH] irqchip/loongson-eiointc: Use early_cpu_to_node() instead of cpu_to_node()

Multi-bridge machines required that all eiointc controllers in the system are initialized, otherwise the system does not boot.

The initialization happens on the boot CPU during early boot and relies on cpu_to_node() for identifying the individual nodes.

That works when the number of possible CPUs is large enough, but with a command line limit, e.g. "nr_cpus=$N" for kdump, but fails when the CPUs of the secondary nodes are not covered.

During early ACPI enumeration all CPU to node mappings are recorded up to CONFIG_NR_CPUS. These are accessible via early_cpu_to_node() even in the case that "nr_cpus=N" truncates the number of possible CPUs and only provides the possible CPUs via cpu_to_node() translation.

Change the node lookup in the driver to use early_cpu_to_node() so that even with a limitation on the number of possible CPUs all eointc instances are initialized.

This can't obviously cure the case where CONFIG_NR_CPUS is too small.

[ tglx: Massaged changelog ]

Fixes: 64cc451e45e1 ("irqchip/loongson-eiointc: Fix incorrect use of acpi_get_vec_parent") Signed-off-by: Huacai Chen chenhuacai@loongson.cn Signed-off-by: Thomas Gleixner tglx@linutronix.de Cc: stable@vger.kernel.org Link: https://lore.kernel.org/r/20240623034113.1808727-1-chenhuacai@loongson.cn

diff --git a/drivers/irqchip/irq-loongson-eiointc.c b/drivers/irqchip/irq-loongson-eiointc.c index c7ddebf312ad..b1f2080be2be 100644 --- a/drivers/irqchip/irq-loongson-eiointc.c +++ b/drivers/irqchip/irq-loongson-eiointc.c @@ -15,6 +15,7 @@ #include <linux/irqchip/chained_irq.h> #include <linux/kernel.h> #include <linux/syscore_ops.h> +#include <asm/numa.h>

#define EIOINTC_REG_NODEMAP 0x14a0 #define EIOINTC_REG_IPMAP 0x14c0 @@ -339,7 +340,7 @@ static int __init pch_msi_parse_madt(union acpi_subtable_headers *header, int node;

if (cpu_has_flatmode) - node = cpu_to_node(eiointc_priv[nr_pics - 1]->node * CORES_PER_EIO_NODE); + node = early_cpu_to_node(eiointc_priv[nr_pics - 1]->node * CORES_PER_EIO_NODE); else node = eiointc_priv[nr_pics - 1]->node;

@@ -431,7 +432,7 @@ int __init eiointc_acpi_init(struct irq_domain *parent, goto out_free_handle;

if (cpu_has_flatmode) - node = cpu_to_node(acpi_eiointc->node * CORES_PER_EIO_NODE); + node = early_cpu_to_node(acpi_eiointc->node * CORES_PER_EIO_NODE); else node = acpi_eiointc->node; acpi_set_vec_parent(node, priv->eiointc_domain, pch_group);