diff --git a/arch/arm/include/uapi/asm/unistd.h b/arch/arm/include/uapi/asm/unistd.h
index 3aaa75cae90c912737efbe9ed834d437d0fcaf01..705bb7620673a10222e3258d94158ab8ec1555c9 100644
--- a/arch/arm/include/uapi/asm/unistd.h
+++ b/arch/arm/include/uapi/asm/unistd.h
@@ -412,6 +412,7 @@
 #define __NR_seccomp			(__NR_SYSCALL_BASE+383)
 #define __NR_getrandom			(__NR_SYSCALL_BASE+384)
 #define __NR_memfd_create		(__NR_SYSCALL_BASE+385)
+#define __NR_bpf			(__NR_SYSCALL_BASE+386)
 
 /*
  * The following SWIs are ARM private.
diff --git a/arch/arm/kernel/calls.S b/arch/arm/kernel/calls.S
index 9f899d8fdccabb4751bddf48da8f522a17905c75..e51833f8cc387118ae3826a0a78a533f4ff90a5f 100644
--- a/arch/arm/kernel/calls.S
+++ b/arch/arm/kernel/calls.S
@@ -395,6 +395,7 @@
 		CALL(sys_seccomp)
 		CALL(sys_getrandom)
 /* 385 */	CALL(sys_memfd_create)
+		CALL(sys_bpf)
 #ifndef syscalls_counted
 .equ syscalls_padding, ((NR_syscalls + 3) & ~3) - NR_syscalls
 #define syscalls_counted
diff --git a/arch/arm/mm/cache-l2x0.c b/arch/arm/mm/cache-l2x0.c
index 55f9d6e0cc88b87feaa41d443f521ce9bb1aef52..5e65ca8dea62cf3f38d48f2ad8a25425ab0ce6de 100644
--- a/arch/arm/mm/cache-l2x0.c
+++ b/arch/arm/mm/cache-l2x0.c
@@ -956,7 +956,7 @@ static u32 cache_id_part_number_from_dt;
  * @associativity: variable to return the calculated associativity in
  * @max_way_size: the maximum size in bytes for the cache ways
  */
-static void __init l2x0_cache_size_of_parse(const struct device_node *np,
+static int __init l2x0_cache_size_of_parse(const struct device_node *np,
 					    u32 *aux_val, u32 *aux_mask,
 					    u32 *associativity,
 					    u32 max_way_size)
@@ -974,7 +974,7 @@ static void __init l2x0_cache_size_of_parse(const struct device_node *np,
 	of_property_read_u32(np, "cache-line-size", &line_size);
 
 	if (!cache_size || !sets)
-		return;
+		return -ENODEV;
 
 	/* All these l2 caches have the same line = block size actually */
 	if (!line_size) {
@@ -1009,7 +1009,7 @@ static void __init l2x0_cache_size_of_parse(const struct device_node *np,
 
 	if (way_size > max_way_size) {
 		pr_err("L2C OF: set size %dKB is too large\n", way_size);
-		return;
+		return -EINVAL;
 	}
 
 	pr_info("L2C OF: override cache size: %d bytes (%dKB)\n",
@@ -1027,7 +1027,7 @@ static void __init l2x0_cache_size_of_parse(const struct device_node *np,
 	if (way_size_bits < 1 || way_size_bits > 6) {
 		pr_err("L2C OF: cache way size illegal: %dKB is not mapped\n",
 		       way_size);
-		return;
+		return -EINVAL;
 	}
 
 	mask |= L2C_AUX_CTRL_WAY_SIZE_MASK;
@@ -1036,6 +1036,8 @@ static void __init l2x0_cache_size_of_parse(const struct device_node *np,
 	*aux_val &= ~mask;
 	*aux_val |= val;
 	*aux_mask &= ~mask;
+
+	return 0;
 }
 
 static void __init l2x0_of_parse(const struct device_node *np,
@@ -1046,6 +1048,7 @@ static void __init l2x0_of_parse(const struct device_node *np,
 	u32 dirty = 0;
 	u32 val = 0, mask = 0;
 	u32 assoc;
+	int ret;
 
 	of_property_read_u32(np, "arm,tag-latency", &tag);
 	if (tag) {
@@ -1068,7 +1071,10 @@ static void __init l2x0_of_parse(const struct device_node *np,
 		val |= (dirty - 1) << L2X0_AUX_CTRL_DIRTY_LATENCY_SHIFT;
 	}
 
-	l2x0_cache_size_of_parse(np, aux_val, aux_mask, &assoc, SZ_256K);
+	ret = l2x0_cache_size_of_parse(np, aux_val, aux_mask, &assoc, SZ_256K);
+	if (ret)
+		return;
+
 	if (assoc > 8) {
 		pr_err("l2x0 of: cache setting yield too high associativity\n");
 		pr_err("l2x0 of: %d calculated, max 8\n", assoc);
@@ -1125,6 +1131,7 @@ static void __init l2c310_of_parse(const struct device_node *np,
 	u32 tag[3] = { 0, 0, 0 };
 	u32 filter[2] = { 0, 0 };
 	u32 assoc;
+	int ret;
 
 	of_property_read_u32_array(np, "arm,tag-latency", tag, ARRAY_SIZE(tag));
 	if (tag[0] && tag[1] && tag[2])
@@ -1152,7 +1159,10 @@ static void __init l2c310_of_parse(const struct device_node *np,
 			       l2x0_base + L310_ADDR_FILTER_START);
 	}
 
-	l2x0_cache_size_of_parse(np, aux_val, aux_mask, &assoc, SZ_512K);
+	ret = l2x0_cache_size_of_parse(np, aux_val, aux_mask, &assoc, SZ_512K);
+	if (ret)
+		return;
+
 	switch (assoc) {
 	case 16:
 		*aux_val &= ~L2X0_AUX_CTRL_ASSOC_MASK;
@@ -1164,8 +1174,8 @@ static void __init l2c310_of_parse(const struct device_node *np,
 		*aux_mask &= ~L2X0_AUX_CTRL_ASSOC_MASK;
 		break;
 	default:
-		pr_err("PL310 OF: cache setting yield illegal associativity\n");
-		pr_err("PL310 OF: %d calculated, only 8 and 16 legal\n", assoc);
+		pr_err("L2C-310 OF cache associativity %d invalid, only 8 or 16 permitted\n",
+		       assoc);
 		break;
 	}
 }
diff --git a/arch/arm/mm/dma-mapping.c b/arch/arm/mm/dma-mapping.c
index c245d903927fadfdee177b4d94b876ae2473618e..e8907117861ef81a79938df32b1889a80e7cdc5a 100644
--- a/arch/arm/mm/dma-mapping.c
+++ b/arch/arm/mm/dma-mapping.c
@@ -1198,7 +1198,6 @@ __iommu_alloc_remap(struct page **pages, size_t size, gfp_t gfp, pgprot_t prot,
 {
 	return dma_common_pages_remap(pages, size,
 			VM_ARM_DMA_CONSISTENT | VM_USERMAP, prot, caller);
-	return NULL;
 }
 
 /*
diff --git a/arch/arm/mm/highmem.c b/arch/arm/mm/highmem.c
index 45aeaaca9052f237322cf91a247a69fdb2d1571e..e17ed00828d722cad66a756695311ad691ae68cf 100644
--- a/arch/arm/mm/highmem.c
+++ b/arch/arm/mm/highmem.c
@@ -127,8 +127,11 @@ void *kmap_atomic_pfn(unsigned long pfn)
 {
 	unsigned long vaddr;
 	int idx, type;
+	struct page *page = pfn_to_page(pfn);
 
 	pagefault_disable();
+	if (!PageHighMem(page))
+		return page_address(page);
 
 	type = kmap_atomic_idx_push();
 	idx = type + KM_TYPE_NR * smp_processor_id();