FAILED: patch "[PATCH] LoongArch: Use pa_to_nid()/nid_to_addrbase() rather than hard-code" failed to apply to 5.15-stable tree

[Sasha Levin <sashal@kernel.org>]

The patch below does not apply to the 5.15-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-5.15.y
git checkout FETCH_HEAD
git cherry-pick -x 244eb26bbd152896f976db6415550993cd60b46d
# <resolve conflicts, build, test, etc.>
git commit -s
git send-email --to '<stable@vger.kernel.org>' --in-reply-to '20261107061238-failed-5.15-244eb26bbd15@kernel.org' --subject-prefix 'PATCH 5.15.y' 'HEAD^..'

Thanks,
Sasha

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

From 244eb26bbd152896f976db6415550993cd60b46d Mon Sep 17 00:00:00 2001
From: Huacai Chen <chenhuacai@loongson.cn>
Date: Tue, 27 Oct 2026 22:51:23 +0800
Subject: [PATCH] LoongArch: Use pa_to_nid()/nid_to_addrbase() rather than
 hard-code

NODE_ADDRSPACE_SHIFT is 44 now but may be changed in future, so use
pa_to_nid()/nid_to_addrbase() rather than hard-code.

Cc: stable@vger.kernel.org
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
---
 arch/loongarch/include/asm/numa.h | 2 +-
 arch/loongarch/kernel/irq.c       | 3 ++-
 arch/loongarch/pci/pci.c          | 3 ++-
 3 files changed, 5 insertions(+), 3 deletions(-)

diff --git a/arch/loongarch/include/asm/numa.h b/arch/loongarch/include/asm/numa.h
index bbf9f70bd25f4..c9654ff900a3a 100644
--- a/arch/loongarch/include/asm/numa.h
+++ b/arch/loongarch/include/asm/numa.h
@@ -14,7 +14,7 @@
 #define NODE_ADDRSPACE_SHIFT 44
 
 #define pa_to_nid(addr)		(((addr) & 0xf00000000000) >> NODE_ADDRSPACE_SHIFT)
-#define nid_to_addrbase(nid)	(_ULCAST_(nid) << NODE_ADDRSPACE_SHIFT)
+#define nid_to_addrbase(nid)	(_U64CAST_(nid) << NODE_ADDRSPACE_SHIFT)
 
 #ifdef CONFIG_NUMA
 
diff --git a/arch/loongarch/kernel/irq.c b/arch/loongarch/kernel/irq.c
index 7bf68a7a5f4b3..29e0f2baaa8c1 100644
--- a/arch/loongarch/kernel/irq.c
+++ b/arch/loongarch/kernel/irq.c
@@ -20,6 +20,7 @@
 
 #include <asm/irq.h>
 #include <asm/loongson.h>
+#include <asm/numa.h>
 #include <asm/setup.h>
 
 DEFINE_PER_CPU(unsigned long, irq_stack);
@@ -69,7 +70,7 @@ static int __init early_pci_mcfg_parse(struct acpi_table_header *header)
 
 	for (i = 0; i < n; i++, mptr++) {
 		msi_group[i].pci_segment = mptr->pci_segment;
-		pch_group[i].node = msi_group[i].node = (mptr->address >> 44) & 0xf;
+		pch_group[i].node = msi_group[i].node = pa_to_nid(mptr->address);
 	}
 
 	return 0;
diff --git a/arch/loongarch/pci/pci.c b/arch/loongarch/pci/pci.c
index f33c7ea1443d9..0b99b32110a5d 100644
--- a/arch/loongarch/pci/pci.c
+++ b/arch/loongarch/pci/pci.c
@@ -12,6 +12,7 @@
 #include <linux/io-64-nonatomic-lo-hi.h>
 #include <asm/cacheflush.h>
 #include <asm/loongson.h>
+#include <asm/numa.h>
 
 #define PCI_DEVICE_ID_LOONGSON_HOST     0x7a00
 #define PCI_DEVICE_ID_LOONGSON_DC1      0x7a06
@@ -43,7 +44,7 @@ int raw_pci_write(unsigned int domain, unsigned int bus, unsigned int devfn,
 
 phys_addr_t mcfg_addr_init(int node)
 {
-	return (((u64)node << 44) | MCFG_EXT_PCICFG_BASE);
+	return (nid_to_addrbase(node) | MCFG_EXT_PCICFG_BASE);
 }
 
 static int __init pcibios_init(void)
-- 
2.53.0