diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index fcb0a9ae98726518b578a5dabaf751cf0e404ea5..752deddc9ed9a18dbdb1548fd63eeaf9613bdd48 100644
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -797,6 +797,7 @@ config DATA_SHIFT
 	range 17 28 if (STRICT_KERNEL_RWX || DEBUG_PAGEALLOC) && PPC_BOOK3S_32
 	range 19 23 if (STRICT_KERNEL_RWX || DEBUG_PAGEALLOC) && PPC_8xx
 	default 22 if STRICT_KERNEL_RWX && PPC_BOOK3S_32
+	default 18 if DEBUG_PAGEALLOC && PPC_BOOK3S_32
 	default 23 if STRICT_KERNEL_RWX && PPC_8xx
 	default 23 if DEBUG_PAGEALLOC && PPC_8xx && PIN_TLB_DATA
 	default 19 if DEBUG_PAGEALLOC && PPC_8xx
diff --git a/arch/powerpc/mm/book3s32/mmu.c b/arch/powerpc/mm/book3s32/mmu.c
index a9b2cbc74797737d1bd4b6fd39043f3265851f67..a6dcc708eee39aa779318bb6518fd68bc15d35a8 100644
--- a/arch/powerpc/mm/book3s32/mmu.c
+++ b/arch/powerpc/mm/book3s32/mmu.c
@@ -170,6 +170,12 @@ unsigned long __init mmu_mapin_ram(unsigned long base, unsigned long top)
 		pr_debug("RAM mapped without BATs\n");
 		return base;
 	}
+	if (debug_pagealloc_enabled()) {
+		if (base >= border)
+			return base;
+		if (top >= border)
+			top = border;
+	}
 
 	if (!strict_kernel_rwx_enabled() || base >= border || top <= border)
 		return __mmu_mapin_ram(base, top);
diff --git a/arch/powerpc/mm/init_32.c b/arch/powerpc/mm/init_32.c
index 8977a7c2543dd7ebe155ce3f66e670533fe6d950..36c39bd372564dce06e73a31b3fe57ae28723723 100644
--- a/arch/powerpc/mm/init_32.c
+++ b/arch/powerpc/mm/init_32.c
@@ -99,10 +99,9 @@ static void __init MMU_setup(void)
 	if (IS_ENABLED(CONFIG_PPC_8xx))
 		return;
 
-	if (debug_pagealloc_enabled()) {
-		__map_without_bats = 1;
+	if (debug_pagealloc_enabled())
 		__map_without_ltlbs = 1;
-	}
+
 	if (strict_kernel_rwx_enabled())
 		__map_without_ltlbs = 1;
 }