powerpc/powernv: Increase memory block size to 1GB on radix

[mirror_ubuntu-bionic-kernel.git] / arch / powerpc / platforms / powernv / setup.c

diff --git a/arch/powerpc/platforms/powernv/setup.c b/arch/powerpc/platforms/powernv/setup.c
index 897aa1400eb833e944fabbc65840904006267a1f..bbb73aa0eb8f041630110c795828215471cc5f2d 100644 (file)
--- a/arch/powerpc/platforms/powernv/setup.c
+++ b/arch/powerpc/platforms/powernv/setup.c
@@ -272,7 +272,15 @@ static void pnv_kexec_cpu_down(int crash_shutdown, int secondary)
 #ifdef CONFIG_MEMORY_HOTPLUG_SPARSE
 static unsigned long pnv_memory_block_size(void)
 {
-       return 256UL * 1024 * 1024;
+       /*
+        * We map the kernel linear region with 1GB large pages on radix. For
+        * memory hot unplug to work our memory block size must be at least
+        * this size.
+        */
+       if (radix_enabled())
+               return 1UL * 1024 * 1024 * 1024;
+       else
+               return 256UL * 1024 * 1024;
 }
 #endif