diff --git a/srcpkgs/linux5.10/patches/ppc32-cpu-hotplug.patch b/srcpkgs/linux5.10/patches/ppc32-cpu-hotplug.patch
new file mode 100644
index 00000000000..f61d9e497be
--- /dev/null
+++ b/srcpkgs/linux5.10/patches/ppc32-cpu-hotplug.patch
@@ -0,0 +1,34 @@
+Drop after the respective upstream fix.
+
+From e3f22abab59aad3af3b555c4aa9af4441d7b4085 Mon Sep 17 00:00:00 2001
+From: Daniel Kolesa <daniel@octaforge.org>
+Date: Thu, 17 Dec 2020 22:28:12 +0100
+Subject: [PATCH] powerpc: only call cleanup_cpu_mmu_context on PPC64 powermacs
+
+Originally introduced in 01b0f0eae0812e80efeee4ee17687e5386335e08.
+
+This was only implemented on book3s64, so on ppc32 build fails
+with implicit function declaration.
+
+Signed-off-by: Daniel Kolesa <daniel@octaforge.org>
+---
+ arch/powerpc/platforms/powermac/smp.c | 2 ++
+ 1 file changed, 2 insertions(+)
+
+diff --git a/arch/powerpc/platforms/powermac/smp.c b/arch/powerpc/platforms/powermac/smp.c
+index adae2a67..7ad90fd0 100644
+--- a/arch/powerpc/platforms/powermac/smp.c
++++ b/arch/powerpc/platforms/powermac/smp.c
+@@ -911,7 +911,9 @@ static int smp_core99_cpu_disable(void)
+ 
+ 	mpic_cpu_set_priority(0xf);
+ 
++#ifdef CONFIG_PPC64
+ 	cleanup_cpu_mmu_context();
++#endif
+ 
+ 	return 0;
+ }
+-- 
+2.29.2
+