diff --git a/include/lib/cpus/aarch64/cortex_a75.h b/include/lib/cpus/aarch64/cortex_a75.h
index 493c7d4..f68f98f 100644
--- a/include/lib/cpus/aarch64/cortex_a75.h
+++ b/include/lib/cpus/aarch64/cortex_a75.h
@@ -4,11 +4,13 @@
  * SPDX-License-Identifier: BSD-3-Clause
  */
 
-#ifndef __CORTEX_A75_H__
-#define __CORTEX_A75_H__
+#ifndef CORTEX_A75_H
+#define CORTEX_A75_H
+
+#include <utils_def.h>
 
 /* Cortex-A75 MIDR */
-#define CORTEX_A75_MIDR		0x410fd0a0
+#define CORTEX_A75_MIDR		U(0x410fd0a0)
 
 /*******************************************************************************
  * CPU Extended Control register specific definitions.
@@ -24,7 +26,7 @@
 #define CORTEX_A75_CPUACTLR_EL1_DISABLE_LOAD_PASS_STORE	(1 << 35)
 
 /* Definitions of register field mask in CORTEX_A75_CPUPWRCTLR_EL1 */
-#define CORTEX_A75_CORE_PWRDN_EN_MASK	0x1
+#define CORTEX_A75_CORE_PWRDN_EN_MASK	U(0x1)
 
 #define CORTEX_A75_ACTLR_AMEN_BIT	(U(1) << 4)
 
@@ -50,4 +52,4 @@
 void cortex_a75_amu_write_cpuamcntenclr_el0(unsigned int mask);
 #endif /* __ASSEMBLY__ */
 
-#endif /* __CORTEX_A75_H__ */
+#endif /* CORTEX_A75_H */
diff --git a/include/lib/cpus/aarch64/cortex_ares.h b/include/lib/cpus/aarch64/cortex_ares.h
index 84955b1..4f3e812 100644
--- a/include/lib/cpus/aarch64/cortex_ares.h
+++ b/include/lib/cpus/aarch64/cortex_ares.h
@@ -4,11 +4,13 @@
  * SPDX-License-Identifier: BSD-3-Clause
  */
 
-#ifndef __CORTEX_ARES_H__
-#define __CORTEX_ARES_H__
+#ifndef CORTEX_ARES_H
+#define CORTEX_ARES_H
+
+#include <utils_def.h>
 
 /* Cortex-ARES MIDR for revision 0 */
-#define CORTEX_ARES_MIDR		0x410fd0c0
+#define CORTEX_ARES_MIDR		U(0x410fd0c0)
 
 /*******************************************************************************
  * CPU Extended Control register specific definitions.
@@ -17,7 +19,7 @@
 #define CORTEX_ARES_CPUECTLR_EL1	S3_0_C15_C1_4
 
 /* Definitions of register field mask in CORTEX_ARES_CPUPWRCTLR_EL1 */
-#define CORTEX_ARES_CORE_PWRDN_EN_MASK	0x1
+#define CORTEX_ARES_CORE_PWRDN_EN_MASK	U(0x1)
 
 #define CORTEX_ARES_ACTLR_AMEN_BIT	(U(1) << 4)
 
@@ -30,4 +32,4 @@
 #define CPUPOR_EL3	S3_6_C15_C8_2
 #define CPUPMR_EL3	S3_6_C15_C8_3
 
-#endif /* __CORTEX_ARES_H__ */
+#endif /* CORTEX_ARES_H */
diff --git a/include/lib/cpus/aarch64/cpuamu.h b/include/lib/cpus/aarch64/cpuamu.h
index 960a524..921abdb 100644
--- a/include/lib/cpus/aarch64/cpuamu.h
+++ b/include/lib/cpus/aarch64/cpuamu.h
@@ -4,8 +4,8 @@
  * SPDX-License-Identifier: BSD-3-Clause
  */
 
-#ifndef __CPUAMU_H__
-#define __CPUAMU_H__
+#ifndef CPUAMU_H
+#define CPUAMU_H
 
 /*******************************************************************************
  * CPU Activity Monitor Unit register specific definitions.
@@ -32,8 +32,8 @@
 #ifndef __ASSEMBLY__
 #include <stdint.h>
 
-uint64_t cpuamu_cnt_read(int idx);
-void cpuamu_cnt_write(int idx, uint64_t val);
+uint64_t cpuamu_cnt_read(unsigned int idx);
+void cpuamu_cnt_write(unsigned int idx, uint64_t val);
 unsigned int cpuamu_read_cpuamcntenset_el0(void);
 unsigned int cpuamu_read_cpuamcntenclr_el0(void);
 void cpuamu_write_cpuamcntenset_el0(unsigned int mask);
@@ -45,4 +45,4 @@
 
 #endif /* __ASSEMBLY__ */
 
-#endif /* __CPUAMU_H__ */
+#endif /* CPUAMU_H */
diff --git a/include/lib/cpus/errata_report.h b/include/lib/cpus/errata_report.h
index d2138bf..c97d4c2 100644
--- a/include/lib/cpus/errata_report.h
+++ b/include/lib/cpus/errata_report.h
@@ -4,8 +4,8 @@
  * SPDX-License-Identifier: BSD-3-Clause
  */
 
-#ifndef __ERRATA_H__
-#define __ERRATA_H__
+#ifndef ERRATA_REPORT_H
+#define ERRATA_REPORT_H
 
 #ifndef __ASSEMBLY__
 
@@ -30,5 +30,4 @@
 #define ERRATA_APPLIES		1
 #define ERRATA_MISSING		2
 
-#endif /* __ERRATA_H__ */
-
+#endif /* ERRATA_REPORT_H */
diff --git a/include/lib/cpus/wa_cve_2017_5715.h b/include/lib/cpus/wa_cve_2017_5715.h
index 0a65a56..940fc65 100644
--- a/include/lib/cpus/wa_cve_2017_5715.h
+++ b/include/lib/cpus/wa_cve_2017_5715.h
@@ -4,9 +4,9 @@
  * SPDX-License-Identifier: BSD-3-Clause
  */
 
-#ifndef __WA_CVE_2017_5715_H__
-#define __WA_CVE_2017_5715_H__
+#ifndef WA_CVE_2017_5715_H
+#define WA_CVE_2017_5715_H
 
 int check_wa_cve_2017_5715(void);
 
-#endif /* __WA_CVE_2017_5715_H__ */
+#endif /* WA_CVE_2017_5715_H */
diff --git a/include/lib/cpus/wa_cve_2018_3639.h b/include/lib/cpus/wa_cve_2018_3639.h
index 36546f7..e37db37 100644
--- a/include/lib/cpus/wa_cve_2018_3639.h
+++ b/include/lib/cpus/wa_cve_2018_3639.h
@@ -4,9 +4,9 @@
  * SPDX-License-Identifier: BSD-3-Clause
  */
 
-#ifndef __WA_CVE_2018_3639_H__
-#define __WA_CVE_2018_3639_H__
+#ifndef WA_CVE_2018_3639_H
+#define WA_CVE_2018_3639_H
 
 void *wa_cve_2018_3639_get_disable_ptr(void);
 
-#endif /* __WA_CVE_2018_3639_H__ */
+#endif /* WA_CVE_2018_3639_H */
diff --git a/include/lib/el3_runtime/cpu_data.h b/include/lib/el3_runtime/cpu_data.h
index 15d34eb..b695950 100644
--- a/include/lib/el3_runtime/cpu_data.h
+++ b/include/lib/el3_runtime/cpu_data.h
@@ -4,8 +4,8 @@
  * SPDX-License-Identifier: BSD-3-Clause
  */
 
-#ifndef __CPU_DATA_H__
-#define __CPU_DATA_H__
+#ifndef CPU_DATA_H
+#define CPU_DATA_H
 
 #include <ehf.h>
 #include <platform_def.h>	/* CACHE_WRITEBACK_GRANULE required */
@@ -161,4 +161,4 @@
 
 
 #endif /* __ASSEMBLY__ */
-#endif /* __CPU_DATA_H__ */
+#endif /* CPU_DATA_H */
diff --git a/include/lib/extensions/amu.h b/include/lib/extensions/amu.h
index 46d5e15..1836fe5 100644
--- a/include/lib/extensions/amu.h
+++ b/include/lib/extensions/amu.h
@@ -4,33 +4,35 @@
  * SPDX-License-Identifier: BSD-3-Clause
  */
 
-#ifndef __AMU_H__
-#define __AMU_H__
+#ifndef AMU_H
+#define AMU_H
 
 #include <cassert.h>
 #include <platform_def.h>
+#include <stdbool.h>
 #include <stdint.h>
+#include <utils_def.h>
 
 /* All group 0 counters */
-#define AMU_GROUP0_COUNTERS_MASK	0xf
+#define AMU_GROUP0_COUNTERS_MASK	U(0xf)
 
 #ifdef PLAT_AMU_GROUP1_COUNTERS_MASK
 #define AMU_GROUP1_COUNTERS_MASK	PLAT_AMU_GROUP1_COUNTERS_MASK
 #else
-#define AMU_GROUP1_COUNTERS_MASK	0
+#define AMU_GROUP1_COUNTERS_MASK	U(0)
 #endif
 
 #ifdef PLAT_AMU_GROUP1_NR_COUNTERS
 #define AMU_GROUP1_NR_COUNTERS		PLAT_AMU_GROUP1_NR_COUNTERS
 #else
-#define AMU_GROUP1_NR_COUNTERS		0
+#define AMU_GROUP1_NR_COUNTERS		U(0)
 #endif
 
 CASSERT(AMU_GROUP1_COUNTERS_MASK <= 0xffff, invalid_amu_group1_counters_mask);
 CASSERT(AMU_GROUP1_NR_COUNTERS <= 16, invalid_amu_group1_nr_counters);
 
-int amu_supported(void);
-void amu_enable(int el2_unused);
+bool amu_supported(void);
+void amu_enable(bool el2_unused);
 
 /* Group 0 configuration helpers */
 uint64_t amu_group0_cnt_read(int idx);
@@ -41,4 +43,4 @@
 void amu_group1_cnt_write(int idx, uint64_t val);
 void amu_group1_set_evtype(int idx, unsigned int val);
 
-#endif /* __AMU_H__ */
+#endif /* AMU_H */
diff --git a/include/lib/extensions/amu_private.h b/include/lib/extensions/amu_private.h
index 0c660bb..ab4e6aa 100644
--- a/include/lib/extensions/amu_private.h
+++ b/include/lib/extensions/amu_private.h
@@ -1,19 +1,19 @@
 /*
- * Copyright (c) 2017, ARM Limited and Contributors. All rights reserved.
+ * Copyright (c) 2017-2018, ARM Limited and Contributors. All rights reserved.
  *
  * SPDX-License-Identifier: BSD-3-Clause
  */
 
-#ifndef __AMU_PRIVATE_H__
-#define __AMU_PRIVATE_H__
+#ifndef AMU_PRIVATE_H
+#define AMU_PRIVATE_H
 
 #include <stdint.h>
 
 uint64_t amu_group0_cnt_read_internal(int idx);
-void amu_group0_cnt_write_internal(int idx, uint64_t);
+void amu_group0_cnt_write_internal(int idx, uint64_t val);
 
 uint64_t amu_group1_cnt_read_internal(int idx);
-void amu_group1_cnt_write_internal(int idx, uint64_t);
+void amu_group1_cnt_write_internal(int idx, uint64_t val);
 void amu_group1_set_evtype_internal(int idx, unsigned int val);
 
-#endif /* __AMU_PRIVATE_H__ */
+#endif /* AMU_PRIVATE_H */
diff --git a/include/lib/extensions/mpam.h b/include/lib/extensions/mpam.h
index 571b96b..ac8c00a 100644
--- a/include/lib/extensions/mpam.h
+++ b/include/lib/extensions/mpam.h
@@ -10,6 +10,6 @@
 #include <stdbool.h>
 
 bool mpam_supported(void);
-void mpam_enable(int el2_unused);
+void mpam_enable(bool el2_unused);
 
 #endif /* MPAM_H */
diff --git a/include/lib/extensions/spe.h b/include/lib/extensions/spe.h
index b2b188e..d4b925f 100644
--- a/include/lib/extensions/spe.h
+++ b/include/lib/extensions/spe.h
@@ -4,11 +4,13 @@
  * SPDX-License-Identifier: BSD-3-Clause
  */
 
-#ifndef __SPE_H__
-#define __SPE_H__
+#ifndef SPE_H
+#define SPE_H
 
-int spe_supported(void);
-void spe_enable(int el2_unused);
+#include <stdbool.h>
+
+bool spe_supported(void);
+void spe_enable(bool el2_unused);
 void spe_disable(void);
 
-#endif /* __SPE_H__ */
+#endif /* SPE_H */
diff --git a/include/lib/extensions/sve.h b/include/lib/extensions/sve.h
index 9c7f37f..83df177 100644
--- a/include/lib/extensions/sve.h
+++ b/include/lib/extensions/sve.h
@@ -4,10 +4,12 @@
  * SPDX-License-Identifier: BSD-3-Clause
  */
 
-#ifndef __SVE_H__
-#define __SVE_H__
+#ifndef SVE_H
+#define SVE_H
 
-int sve_supported(void);
-void sve_enable(int el2_unused);
+#include <stdbool.h>
+
+bool sve_supported(void);
+void sve_enable(bool el2_unused);
 
-#endif /* __SVE_H__ */
+#endif /* SVE_H */
diff --git a/include/lib/pmf/pmf.h b/include/lib/pmf/pmf.h
index a3812fb..18ef0a5 100644
--- a/include/lib/pmf/pmf.h
+++ b/include/lib/pmf/pmf.h
@@ -9,17 +9,18 @@
 
 #include <cassert.h>
 #include <pmf_helpers.h>
+#include <utils_def.h>
 
 /*
  * Constants used for/by PMF services.
  */
-#define PMF_ARM_TIF_IMPL_ID	0x41
+#define PMF_ARM_TIF_IMPL_ID	U(0x41)
 #define PMF_TID_SHIFT		0
-#define PMF_TID_MASK		(0xFF << PMF_TID_SHIFT)
+#define PMF_TID_MASK		(U(0xFF) << PMF_TID_SHIFT)
 #define PMF_SVC_ID_SHIFT	10
-#define PMF_SVC_ID_MASK		(0x3F << PMF_SVC_ID_SHIFT)
+#define PMF_SVC_ID_MASK		(U(0x3F) << PMF_SVC_ID_SHIFT)
 #define PMF_IMPL_ID_SHIFT	24
-#define PMF_IMPL_ID_MASK	(0xFFU << PMF_IMPL_ID_SHIFT)
+#define PMF_IMPL_ID_MASK	(U(0xFF) << PMF_IMPL_ID_SHIFT)
 
 /*
  * Flags passed to PMF_REGISTER_SERVICE
@@ -37,16 +38,16 @@
 /*
  * Defines for PMF SMC function ids.
  */
-#define PMF_SMC_GET_TIMESTAMP_32	0x82000010u
-#define PMF_SMC_GET_TIMESTAMP_64	0xC2000010u
+#define PMF_SMC_GET_TIMESTAMP_32	U(0x82000010)
+#define PMF_SMC_GET_TIMESTAMP_64	U(0xC2000010)
 #define PMF_NUM_SMC_CALLS		2
 
 /*
  * The macros below are used to identify
  * PMF calls from the SMC function ID.
  */
-#define PMF_FID_MASK	0xffe0u
-#define PMF_FID_VALUE	0u
+#define PMF_FID_MASK	U(0xffe0)
+#define PMF_FID_VALUE	U(0)
 #define is_pmf_fid(_fid)	(((_fid) & PMF_FID_MASK) == PMF_FID_VALUE)
 
 /* Following are the supported PMF service IDs */
diff --git a/include/lib/pmf/pmf_helpers.h b/include/lib/pmf/pmf_helpers.h
index b9757de..c535b22 100644
--- a/include/lib/pmf/pmf_helpers.h
+++ b/include/lib/pmf/pmf_helpers.h
@@ -11,7 +11,6 @@
 #include <assert.h>
 #include <bl_common.h>
 #include <platform.h>
-#include <pmf.h>
 #include <stddef.h>
 #include <stdint.h>
 
diff --git a/include/plat/arm/common/arm_sip_svc.h b/include/plat/arm/common/arm_sip_svc.h
index 68375af..3e25cbc 100644
--- a/include/plat/arm/common/arm_sip_svc.h
+++ b/include/plat/arm/common/arm_sip_svc.h
@@ -1,24 +1,26 @@
 /*
- * Copyright (c) 2016-2017, ARM Limited and Contributors. All rights reserved.
+ * Copyright (c) 2016-2018, ARM Limited and Contributors. All rights reserved.
  *
  * SPDX-License-Identifier: BSD-3-Clause
  */
 
-#ifndef __ARM_SIP_SVC_H__
-#define __ARM_SIP_SVC_H__
+#ifndef ARM_SIP_SVC_H
+#define ARM_SIP_SVC_H
+
+#include <utils_def.h>
 
 /* SMC function IDs for SiP Service queries */
 
-#define ARM_SIP_SVC_CALL_COUNT		0x8200ff00
-#define ARM_SIP_SVC_UID			0x8200ff01
-/*					0x8200ff02 is reserved */
-#define ARM_SIP_SVC_VERSION		0x8200ff03
+#define ARM_SIP_SVC_CALL_COUNT		U(0x8200ff00)
+#define ARM_SIP_SVC_UID			U(0x8200ff01)
+/*					U(0x8200ff02) is reserved */
+#define ARM_SIP_SVC_VERSION		U(0x8200ff03)
 
 /* Function ID for requesting state switch of lower EL */
-#define ARM_SIP_SVC_EXE_STATE_SWITCH	0x82000020
+#define ARM_SIP_SVC_EXE_STATE_SWITCH	U(0x82000020)
 
 /* ARM SiP Service Calls version numbers */
-#define ARM_SIP_SVC_VERSION_MAJOR		0x0
-#define ARM_SIP_SVC_VERSION_MINOR		0x2
+#define ARM_SIP_SVC_VERSION_MAJOR		U(0x0)
+#define ARM_SIP_SVC_VERSION_MINOR		U(0x2)
 
-#endif /* __ARM_SIP_SVC_H__ */
+#endif /* ARM_SIP_SVC_H */
diff --git a/include/plat/arm/common/plat_arm.h b/include/plat/arm/common/plat_arm.h
index bdcb144..e7082d0 100644
--- a/include/plat/arm/common/plat_arm.h
+++ b/include/plat/arm/common/plat_arm.h
@@ -3,8 +3,8 @@
  *
  * SPDX-License-Identifier: BSD-3-Clause
  */
-#ifndef __PLAT_ARM_H__
-#define __PLAT_ARM_H__
+#ifndef PLAT_ARM_H
+#define PLAT_ARM_H
 
 #include <bakery_lock.h>
 #include <cassert.h>
@@ -292,4 +292,4 @@
 extern const mmap_region_t plat_arm_mmap[];
 extern const unsigned int arm_pm_idle_states[];
 
-#endif /* __PLAT_ARM_H__ */
+#endif /* PLAT_ARM_H */
diff --git a/lib/cpus/aarch64/cortex_a75_pubsub.c b/lib/cpus/aarch64/cortex_a75_pubsub.c
index 16f62f4..f4ca486 100644
--- a/lib/cpus/aarch64/cortex_a75_pubsub.c
+++ b/lib/cpus/aarch64/cortex_a75_pubsub.c
@@ -12,14 +12,16 @@
 {
 	if (midr_match(CORTEX_A75_MIDR) != 0)
 		cpuamu_context_save(CORTEX_A75_AMU_NR_COUNTERS);
-	return 0;
+
+	return (void *)0;
 }
 
 static void *cortex_a75_context_restore(const void *arg)
 {
 	if (midr_match(CORTEX_A75_MIDR) != 0)
 		cpuamu_context_restore(CORTEX_A75_AMU_NR_COUNTERS);
-	return 0;
+
+	return (void *)0;
 }
 
 SUBSCRIBE_TO_EVENT(psci_suspend_pwrdown_start, cortex_a75_context_save);
diff --git a/lib/cpus/aarch64/cortex_ares_pubsub.c b/lib/cpus/aarch64/cortex_ares_pubsub.c
index c7d850a..9566223 100644
--- a/lib/cpus/aarch64/cortex_ares_pubsub.c
+++ b/lib/cpus/aarch64/cortex_ares_pubsub.c
@@ -12,14 +12,16 @@
 {
 	if (midr_match(CORTEX_ARES_MIDR) != 0)
 		cpuamu_context_save(CORTEX_ARES_AMU_NR_COUNTERS);
-	return 0;
+
+	return (void *)0;
 }
 
 static void *cortex_ares_context_restore(const void *arg)
 {
 	if (midr_match(CORTEX_ARES_MIDR) != 0)
 		cpuamu_context_restore(CORTEX_ARES_AMU_NR_COUNTERS);
-	return 0;
+
+	return (void *)0;
 }
 
 SUBSCRIBE_TO_EVENT(psci_suspend_pwrdown_start, cortex_ares_context_save);
diff --git a/lib/cpus/aarch64/cpuamu_helpers.S b/lib/cpus/aarch64/cpuamu_helpers.S
index 8965d6d..79b7288 100644
--- a/lib/cpus/aarch64/cpuamu_helpers.S
+++ b/lib/cpus/aarch64/cpuamu_helpers.S
@@ -16,7 +16,7 @@
 	.globl	cpuamu_write_cpuamcntenclr_el0
 
 /*
- * uint64_t cpuamu_cnt_read(int idx);
+ * uint64_t cpuamu_cnt_read(unsigned int idx);
  *
  * Given `idx`, read the corresponding AMU counter
  * and return it in `x0`.
@@ -41,7 +41,7 @@
 endfunc cpuamu_cnt_read
 
 /*
- * void cpuamu_cnt_write(int idx, uint64_t val);
+ * void cpuamu_cnt_write(unsigned int idx, uint64_t val);
  *
  * Given `idx`, write `val` to the corresponding AMU counter.
  */
diff --git a/lib/cpus/errata_report.c b/lib/cpus/errata_report.c
index c679336..42603cb 100644
--- a/lib/cpus/errata_report.c
+++ b/lib/cpus/errata_report.c
@@ -12,6 +12,7 @@
 #include <debug.h>
 #include <errata_report.h>
 #include <spinlock.h>
+#include <stdbool.h>
 #include <utils.h>
 
 #ifdef IMAGE_BL1
@@ -35,10 +36,10 @@
  */
 int errata_needs_reporting(spinlock_t *lock, uint32_t *reported)
 {
-	int report_now;
+	bool report_now;
 
 	/* If already reported, return false. */
-	if (*reported)
+	if (*reported != 0U)
 		return 0;
 
 	/*
@@ -46,7 +47,7 @@
 	 * report status to true.
 	 */
 	spin_lock(lock);
-	report_now = !(*reported);
+	report_now = (*reported == 0U);
 	if (report_now)
 		*reported = 1;
 	spin_unlock(lock);
@@ -75,8 +76,8 @@
 
 
 	assert(status < ARRAY_SIZE(errata_status_str));
-	assert(cpu);
-	assert(id);
+	assert(cpu != NULL);
+	assert(id != NULL);
 
 	msg = errata_status_str[status];
 
diff --git a/lib/el3_runtime/aarch32/context_mgmt.c b/lib/el3_runtime/aarch32/context_mgmt.c
index 11ef6e5..80cea28 100644
--- a/lib/el3_runtime/aarch32/context_mgmt.c
+++ b/lib/el3_runtime/aarch32/context_mgmt.c
@@ -14,6 +14,7 @@
 #include <platform.h>
 #include <platform_def.h>
 #include <smccc_helpers.h>
+#include <stdbool.h>
 #include <string.h>
 #include <utils.h>
 
@@ -129,7 +130,7 @@
  * When EL2 is implemented but unused `el2_unused` is non-zero, otherwise
  * it is zero.
  ******************************************************************************/
-static void enable_extensions_nonsecure(int el2_unused)
+static void enable_extensions_nonsecure(bool el2_unused)
 {
 #if IMAGE_BL32
 #if ENABLE_AMU
@@ -175,7 +176,7 @@
 {
 	uint32_t hsctlr, scr;
 	cpu_context_t *ctx = cm_get_context(security_state);
-	int el2_unused = 0;
+	bool el2_unused = false;
 
 	assert(ctx);
 
@@ -200,7 +201,7 @@
 			isb();
 		} else if (read_id_pfr1() &
 			(ID_PFR1_VIRTEXT_MASK << ID_PFR1_VIRTEXT_SHIFT)) {
-			el2_unused = 1;
+			el2_unused = true;
 
 			/*
 			 * Set the NS bit to access NS copies of certain banked
diff --git a/lib/el3_runtime/aarch64/context_mgmt.c b/lib/el3_runtime/aarch64/context_mgmt.c
index d3984a2..f037e18 100644
--- a/lib/el3_runtime/aarch64/context_mgmt.c
+++ b/lib/el3_runtime/aarch64/context_mgmt.c
@@ -18,6 +18,7 @@
 #include <pubsub_events.h>
 #include <smccc_helpers.h>
 #include <spe.h>
+#include <stdbool.h>
 #include <string.h>
 #include <sve.h>
 #include <utils.h>
@@ -231,7 +232,7 @@
  * When EL2 is implemented but unused `el2_unused` is non-zero, otherwise
  * it is zero.
  ******************************************************************************/
-static void enable_extensions_nonsecure(int el2_unused)
+static void enable_extensions_nonsecure(bool el2_unused)
 {
 #if IMAGE_BL31
 #if ENABLE_SPE_FOR_LOWER_ELS
@@ -289,7 +290,7 @@
 {
 	uint32_t sctlr_elx, scr_el3, mdcr_el2;
 	cpu_context_t *ctx = cm_get_context(security_state);
-	int el2_unused = 0;
+	bool el2_unused = false;
 	uint64_t hcr_el2 = 0;
 
 	assert(ctx);
@@ -304,7 +305,7 @@
 			sctlr_elx |= SCTLR_EL2_RES1;
 			write_sctlr_el2(sctlr_elx);
 		} else if (EL_IMPLEMENTED(2)) {
-			el2_unused = 1;
+			el2_unused = true;
 
 			/*
 			 * EL2 present but unused, need to disable safely.
diff --git a/lib/extensions/amu/aarch32/amu.c b/lib/extensions/amu/aarch32/amu.c
index 05c98f1..585d908 100644
--- a/lib/extensions/amu/aarch32/amu.c
+++ b/lib/extensions/amu/aarch32/amu.c
@@ -10,6 +10,7 @@
 #include <arch_helpers.h>
 #include <platform.h>
 #include <pubsub_events.h>
+#include <stdbool.h>
 
 #define AMU_GROUP0_NR_COUNTERS	4
 
@@ -20,17 +21,17 @@
 
 static struct amu_ctx amu_ctxs[PLATFORM_CORE_COUNT];
 
-int amu_supported(void)
+bool amu_supported(void)
 {
 	uint64_t features;
 
 	features = read_id_pfr0() >> ID_PFR0_AMU_SHIFT;
-	return (features & ID_PFR0_AMU_MASK) == 1;
+	return (features & ID_PFR0_AMU_MASK) == 1U;
 }
 
-void amu_enable(int el2_unused)
+void amu_enable(bool el2_unused)
 {
-	if (amu_supported() == 0)
+	if (!amu_supported())
 		return;
 
 	if (el2_unused) {
@@ -54,8 +55,8 @@
 /* Read the group 0 counter identified by the given `idx`. */
 uint64_t amu_group0_cnt_read(int idx)
 {
-	assert(amu_supported() != 0);
-	assert(idx >= 0 && idx < AMU_GROUP0_NR_COUNTERS);
+	assert(amu_supported());
+	assert((idx >= 0) && (idx < AMU_GROUP0_NR_COUNTERS));
 
 	return amu_group0_cnt_read_internal(idx);
 }
@@ -63,8 +64,8 @@
 /* Write the group 0 counter identified by the given `idx` with `val`. */
 void amu_group0_cnt_write(int idx, uint64_t val)
 {
-	assert(amu_supported() != 0);
-	assert(idx >= 0 && idx < AMU_GROUP0_NR_COUNTERS);
+	assert(amu_supported());
+	assert((idx >= 0) && (idx < AMU_GROUP0_NR_COUNTERS));
 
 	amu_group0_cnt_write_internal(idx, val);
 	isb();
@@ -73,8 +74,8 @@
 /* Read the group 1 counter identified by the given `idx`. */
 uint64_t amu_group1_cnt_read(int idx)
 {
-	assert(amu_supported() != 0);
-	assert(idx >= 0 && idx < AMU_GROUP1_NR_COUNTERS);
+	assert(amu_supported());
+	assert((idx >= 0) && (idx < AMU_GROUP1_NR_COUNTERS));
 
 	return amu_group1_cnt_read_internal(idx);
 }
@@ -82,8 +83,8 @@
 /* Write the group 1 counter identified by the given `idx` with `val`. */
 void amu_group1_cnt_write(int idx, uint64_t val)
 {
-	assert(amu_supported() != 0);
-	assert(idx >= 0 && idx < AMU_GROUP1_NR_COUNTERS);
+	assert(amu_supported());
+	assert((idx >= 0) && (idx < AMU_GROUP1_NR_COUNTERS));
 
 	amu_group1_cnt_write_internal(idx, val);
 	isb();
@@ -91,8 +92,8 @@
 
 void amu_group1_set_evtype(int idx, unsigned int val)
 {
-	assert(amu_supported() != 0);
-	assert(idx >= 0 && idx < AMU_GROUP1_NR_COUNTERS);
+	assert(amu_supported());
+	assert((idx >= 0) && (idx < AMU_GROUP1_NR_COUNTERS));
 
 	amu_group1_set_evtype_internal(idx, val);
 	isb();
@@ -103,7 +104,7 @@
 	struct amu_ctx *ctx;
 	int i;
 
-	if (amu_supported() == 0)
+	if (!amu_supported())
 		return (void *)-1;
 
 	ctx = &amu_ctxs[plat_my_core_pos()];
@@ -126,7 +127,7 @@
 	for (i = 0; i < AMU_GROUP1_NR_COUNTERS; i++)
 		ctx->group1_cnts[i] = amu_group1_cnt_read(i);
 
-	return 0;
+	return (void *)0;
 }
 
 static void *amu_context_restore(const void *arg)
@@ -134,13 +135,13 @@
 	struct amu_ctx *ctx;
 	int i;
 
-	if (amu_supported() == 0)
+	if (!amu_supported())
 		return (void *)-1;
 
 	ctx = &amu_ctxs[plat_my_core_pos()];
 
 	/* Counters were disabled in `amu_context_save()` */
-	assert(read_amcntenset0() == 0 && read_amcntenset1() == 0);
+	assert((read_amcntenset0() == 0U) && (read_amcntenset1() == 0U));
 
 	/* Restore group 0 counters */
 	for (i = 0; i < AMU_GROUP0_NR_COUNTERS; i++)
@@ -153,7 +154,7 @@
 
 	/* Enable group 1 counters */
 	write_amcntenset1(AMU_GROUP1_COUNTERS_MASK);
-	return 0;
+	return (void *)0;
 }
 
 SUBSCRIBE_TO_EVENT(psci_suspend_pwrdown_start, amu_context_save);
diff --git a/lib/extensions/amu/aarch64/amu.c b/lib/extensions/amu/aarch64/amu.c
index 5d556e5..1564e84 100644
--- a/lib/extensions/amu/aarch64/amu.c
+++ b/lib/extensions/amu/aarch64/amu.c
@@ -11,6 +11,7 @@
 #include <assert.h>
 #include <platform.h>
 #include <pubsub_events.h>
+#include <stdbool.h>
 
 #define AMU_GROUP0_NR_COUNTERS	4
 
@@ -21,23 +22,23 @@
 
 static struct amu_ctx amu_ctxs[PLATFORM_CORE_COUNT];
 
-int amu_supported(void)
+bool amu_supported(void)
 {
 	uint64_t features;
 
 	features = read_id_aa64pfr0_el1() >> ID_AA64PFR0_AMU_SHIFT;
-	return (features & ID_AA64PFR0_AMU_MASK) == 1;
+	return (features & ID_AA64PFR0_AMU_MASK) == 1U;
 }
 
 /*
  * Enable counters.  This function is meant to be invoked
  * by the context management library before exiting from EL3.
  */
-void amu_enable(int el2_unused)
+void amu_enable(bool el2_unused)
 {
 	uint64_t v;
 
-	if (amu_supported() == 0)
+	if (!amu_supported())
 		return;
 
 	if (el2_unused) {
@@ -67,8 +68,8 @@
 /* Read the group 0 counter identified by the given `idx`. */
 uint64_t amu_group0_cnt_read(int idx)
 {
-	assert(amu_supported() != 0);
-	assert(idx >= 0 && idx < AMU_GROUP0_NR_COUNTERS);
+	assert(amu_supported());
+	assert((idx >= 0) && (idx < AMU_GROUP0_NR_COUNTERS));
 
 	return amu_group0_cnt_read_internal(idx);
 }
@@ -76,8 +77,8 @@
 /* Write the group 0 counter identified by the given `idx` with `val`. */
 void amu_group0_cnt_write(int idx, uint64_t val)
 {
-	assert(amu_supported() != 0);
-	assert(idx >= 0 && idx < AMU_GROUP0_NR_COUNTERS);
+	assert(amu_supported());
+	assert((idx >= 0) && (idx < AMU_GROUP0_NR_COUNTERS));
 
 	amu_group0_cnt_write_internal(idx, val);
 	isb();
@@ -86,8 +87,8 @@
 /* Read the group 1 counter identified by the given `idx`. */
 uint64_t amu_group1_cnt_read(int idx)
 {
-	assert(amu_supported() != 0);
-	assert(idx >= 0 && idx < AMU_GROUP1_NR_COUNTERS);
+	assert(amu_supported());
+	assert((idx >= 0) && (idx < AMU_GROUP1_NR_COUNTERS));
 
 	return amu_group1_cnt_read_internal(idx);
 }
@@ -95,8 +96,8 @@
 /* Write the group 1 counter identified by the given `idx` with `val`. */
 void amu_group1_cnt_write(int idx, uint64_t val)
 {
-	assert(amu_supported() != 0);
-	assert(idx >= 0 && idx < AMU_GROUP1_NR_COUNTERS);
+	assert(amu_supported());
+	assert((idx >= 0) && (idx < AMU_GROUP1_NR_COUNTERS));
 
 	amu_group1_cnt_write_internal(idx, val);
 	isb();
@@ -108,8 +109,8 @@
  */
 void amu_group1_set_evtype(int idx, unsigned int val)
 {
-	assert(amu_supported() != 0);
-	assert (idx >= 0 && idx < AMU_GROUP1_NR_COUNTERS);
+	assert(amu_supported());
+	assert((idx >= 0) && (idx < AMU_GROUP1_NR_COUNTERS));
 
 	amu_group1_set_evtype_internal(idx, val);
 	isb();
@@ -120,14 +121,14 @@
 	struct amu_ctx *ctx = &amu_ctxs[plat_my_core_pos()];
 	int i;
 
-	if (amu_supported() == 0)
+	if (!amu_supported())
 		return (void *)-1;
 
 	/* Assert that group 0/1 counter configuration is what we expect */
-	assert(read_amcntenset0_el0() == AMU_GROUP0_COUNTERS_MASK &&
-	       read_amcntenset1_el0() == AMU_GROUP1_COUNTERS_MASK);
+	assert((read_amcntenset0_el0() == AMU_GROUP0_COUNTERS_MASK) &&
+	       (read_amcntenset1_el0() == AMU_GROUP1_COUNTERS_MASK));
 
-	assert((sizeof(int) * 8) - __builtin_clz(AMU_GROUP1_COUNTERS_MASK)
+	assert(((sizeof(int) * 8) - __builtin_clz(AMU_GROUP1_COUNTERS_MASK))
 		<= AMU_GROUP1_NR_COUNTERS);
 
 	/*
@@ -146,7 +147,7 @@
 	for (i = 0; i < AMU_GROUP1_NR_COUNTERS; i++)
 		ctx->group1_cnts[i] = amu_group1_cnt_read(i);
 
-	return 0;
+	return (void *)0;
 }
 
 static void *amu_context_restore(const void *arg)
@@ -154,30 +155,30 @@
 	struct amu_ctx *ctx = &amu_ctxs[plat_my_core_pos()];
 	int i;
 
-	if (amu_supported() == 0)
+	if (!amu_supported())
 		return (void *)-1;
 
 	/* Counters were disabled in `amu_context_save()` */
-	assert(read_amcntenset0_el0() == 0 && read_amcntenset1_el0() == 0);
+	assert((read_amcntenset0_el0() == 0U) && (read_amcntenset1_el0() == 0U));
 
-	assert((sizeof(int) * 8) - __builtin_clz(AMU_GROUP1_COUNTERS_MASK)
+	assert(((sizeof(int) * 8U) - __builtin_clz(AMU_GROUP1_COUNTERS_MASK))
 		<= AMU_GROUP1_NR_COUNTERS);
 
 	/* Restore group 0 counters */
 	for (i = 0; i < AMU_GROUP0_NR_COUNTERS; i++)
-		if (AMU_GROUP0_COUNTERS_MASK & (1U << i))
+		if ((AMU_GROUP0_COUNTERS_MASK & (1U << i)) != 0U)
 			amu_group0_cnt_write(i, ctx->group0_cnts[i]);
 
 	/* Restore group 1 counters */
 	for (i = 0; i < AMU_GROUP1_NR_COUNTERS; i++)
-		if (AMU_GROUP1_COUNTERS_MASK & (1U << i))
+		if ((AMU_GROUP1_COUNTERS_MASK & (1U << i)) != 0U)
 			amu_group1_cnt_write(i, ctx->group1_cnts[i]);
 
 	/* Restore group 0/1 counter configuration */
 	write_amcntenset0_el0(AMU_GROUP0_COUNTERS_MASK);
 	write_amcntenset1_el0(AMU_GROUP1_COUNTERS_MASK);
 
-	return 0;
+	return (void *)0;
 }
 
 SUBSCRIBE_TO_EVENT(psci_suspend_pwrdown_start, amu_context_save);
diff --git a/lib/extensions/mpam/mpam.c b/lib/extensions/mpam/mpam.c
index e628827..d57bb47 100644
--- a/lib/extensions/mpam/mpam.c
+++ b/lib/extensions/mpam/mpam.c
@@ -16,7 +16,7 @@
 	return ((features & ID_AA64PFR0_MPAM_MASK) != 0U);
 }
 
-void mpam_enable(int el2_unused)
+void mpam_enable(bool el2_unused)
 {
 	if (!mpam_supported())
 		return;
@@ -31,7 +31,7 @@
 	 * If EL2 is implemented but unused, disable trapping to EL2 when lower
 	 * ELs access their own MPAM registers.
 	 */
-	if (el2_unused != 0) {
+	if (el2_unused) {
 		write_mpam2_el2(0);
 
 		if ((read_mpamidr_el1() & MPAMIDR_HAS_HCR_BIT) != 0U)
diff --git a/lib/extensions/spe/spe.c b/lib/extensions/spe/spe.c
index dc35840..e5df015 100644
--- a/lib/extensions/spe/spe.c
+++ b/lib/extensions/spe/spe.c
@@ -8,26 +8,30 @@
 #include <arch_helpers.h>
 #include <pubsub.h>
 #include <spe.h>
+#include <stdbool.h>
 
-/*
- * The assembler does not yet understand the psb csync mnemonic
- * so use the equivalent hint instruction.
- */
-#define psb_csync()	asm volatile("hint #17")
+static inline void psb_csync(void)
+{
+	/*
+	 * The assembler does not yet understand the psb csync mnemonic
+	 * so use the equivalent hint instruction.
+	 */
+	__asm__ volatile("hint #17");
+}
 
-int spe_supported(void)
+bool spe_supported(void)
 {
 	uint64_t features;
 
 	features = read_id_aa64dfr0_el1() >> ID_AA64DFR0_PMS_SHIFT;
-	return (features & ID_AA64DFR0_PMS_MASK) == 1;
+	return (features & ID_AA64DFR0_PMS_MASK) == 1U;
 }
 
-void spe_enable(int el2_unused)
+void spe_enable(bool el2_unused)
 {
 	uint64_t v;
 
-	if (spe_supported() == 0)
+	if (!spe_supported())
 		return;
 
 	if (el2_unused) {
@@ -59,7 +63,7 @@
 {
 	uint64_t v;
 
-	if (spe_supported() == 0)
+	if (!spe_supported())
 		return;
 
 	/* Drain buffered data */
@@ -75,13 +79,14 @@
 
 static void *spe_drain_buffers_hook(const void *arg)
 {
-	if (spe_supported() == 0)
+	if (!spe_supported())
 		return (void *)-1;
 
 	/* Drain buffered data */
 	psb_csync();
 	dsbnsh();
-	return 0;
+
+	return (void *)0;
 }
 
 SUBSCRIBE_TO_EVENT(cm_entering_secure_world, spe_drain_buffers_hook);
diff --git a/lib/extensions/sve/sve.c b/lib/extensions/sve/sve.c
index 6442487..e031bf6 100644
--- a/lib/extensions/sve/sve.c
+++ b/lib/extensions/sve/sve.c
@@ -7,21 +7,22 @@
 #include <arch.h>
 #include <arch_helpers.h>
 #include <pubsub.h>
+#include <stdbool.h>
 #include <sve.h>
 
-int sve_supported(void)
+bool sve_supported(void)
 {
 	uint64_t features;
 
 	features = read_id_aa64pfr0_el1() >> ID_AA64PFR0_SVE_SHIFT;
-	return (features & ID_AA64PFR0_SVE_MASK) == 1;
+	return (features & ID_AA64PFR0_SVE_MASK) == 1U;
 }
 
 static void *disable_sve_hook(const void *arg)
 {
 	uint64_t cptr;
 
-	if (sve_supported() == 0)
+	if (!sve_supported())
 		return (void *)-1;
 
 	/*
@@ -39,14 +40,14 @@
 	 * No explicit ISB required here as ERET to switch to Secure
 	 * world covers it
 	 */
-	return 0;
+	return (void *)0;
 }
 
 static void *enable_sve_hook(const void *arg)
 {
 	uint64_t cptr;
 
-	if (sve_supported() == 0)
+	if (!sve_supported())
 		return (void *)-1;
 
 	/*
@@ -60,14 +61,14 @@
 	 * No explicit ISB required here as ERET to switch to Non-secure
 	 * world covers it
 	 */
-	return 0;
+	return (void *)0;
 }
 
-void sve_enable(int el2_unused)
+void sve_enable(bool el2_unused)
 {
 	uint64_t cptr;
 
-	if (sve_supported() == 0)
+	if (!sve_supported())
 		return;
 
 #if CTX_INCLUDE_FPREGS
diff --git a/lib/pmf/pmf_main.c b/lib/pmf/pmf_main.c
index 25513c1..fe7bb74 100644
--- a/lib/pmf/pmf_main.c
+++ b/lib/pmf/pmf_main.c
@@ -26,7 +26,7 @@
 IMPORT_SYM(uintptr_t, __PMF_SVC_DESCS_START__,		PMF_SVC_DESCS_START);
 IMPORT_SYM(uintptr_t, __PMF_SVC_DESCS_END__,		PMF_SVC_DESCS_END);
 IMPORT_SYM(uintptr_t, __PMF_PERCPU_TIMESTAMP_END__,	PMF_PERCPU_TIMESTAMP_END);
-IMPORT_SYM(intptr_t,  __PMF_TIMESTAMP_START__,		PMF_TIMESTAMP_ARRAY_START);
+IMPORT_SYM(uintptr_t,  __PMF_TIMESTAMP_START__,		PMF_TIMESTAMP_ARRAY_START);
 
 #define PMF_PERCPU_TIMESTAMP_SIZE	(PMF_PERCPU_TIMESTAMP_END - PMF_TIMESTAMP_ARRAY_START)
 
@@ -67,15 +67,15 @@
 	pmf_svc_descs = (pmf_svc_desc_t *) PMF_SVC_DESCS_START;
 	for (ii = 0; ii < pmf_svc_descs_num; ii++) {
 
-		assert(pmf_svc_descs[ii].get_ts);
+		assert(pmf_svc_descs[ii].get_ts != NULL);
 
 		/*
 		 * Call the initialization routine for this
 		 * PMF service, if it is defined.
 		 */
-		if (pmf_svc_descs[ii].init) {
+		if (pmf_svc_descs[ii].init != NULL) {
 			rc = pmf_svc_descs[ii].init();
-			if (rc) {
+			if (rc != 0) {
 				WARN("Could not initialize PMF"
 					"service %s - skipping \n",
 					pmf_svc_descs[ii].name);
@@ -125,7 +125,7 @@
 	if (pmf_num_services == 0)
 		return NULL;
 
-	assert(pmf_svc_descs);
+	assert(pmf_svc_descs != NULL);
 
 	do {
 		mid = (low + high) / 2;
@@ -158,7 +158,7 @@
 		unsigned long long *ts_value)
 {
 	pmf_svc_desc_t *svc_desc;
-	assert(ts_value);
+	assert(ts_value != NULL);
 
 	/* Search for registered service. */
 	svc_desc = get_service(tid);
@@ -247,7 +247,7 @@
 	unsigned long long *ts_addr = (unsigned long long *)calc_ts_addr(base_addr,
 				tid, cpuid);
 
-	if (flags & PMF_CACHE_MAINT)
+	if ((flags & PMF_CACHE_MAINT) != 0U)
 		inv_dcache_range((uintptr_t)ts_addr, sizeof(unsigned long long));
 
 	return *ts_addr;
diff --git a/lib/pmf/pmf_smc.c b/lib/pmf/pmf_smc.c
index e866118..4c5b14f 100644
--- a/lib/pmf/pmf_smc.c
+++ b/lib/pmf/pmf_smc.c
@@ -37,7 +37,8 @@
 			 * x0 --> error code.
 			 * x1 - x2 --> time-stamp value.
 			 */
-			rc = pmf_get_timestamp_smc(x1, x2, x3, &ts_value);
+			rc = pmf_get_timestamp_smc((unsigned int)x1, x2,
+					(unsigned int)x3, &ts_value);
 			SMC_RET3(handle, rc, (uint32_t)ts_value,
 					(uint32_t)(ts_value >> 32));
 		}
@@ -49,7 +50,8 @@
 			 * x0 --> error code.
 			 * x1 --> time-stamp value.
 			 */
-			rc = pmf_get_timestamp_smc(x1, x2, x3, &ts_value);
+			rc = pmf_get_timestamp_smc((unsigned int)x1, x2,
+					(unsigned int)x3, &ts_value);
 			SMC_RET2(handle, rc, ts_value);
 		}
 	}
diff --git a/plat/arm/common/arm_sip_svc.c b/plat/arm/common/arm_sip_svc.c
index e450c6f..e482a89 100644
--- a/plat/arm/common/arm_sip_svc.c
+++ b/plat/arm/common/arm_sip_svc.c
@@ -58,7 +58,7 @@
 
 		/* Validate supplied entry point */
 		pc = (u_register_t) ((x1 << 32) | (uint32_t) x2);
-		if (arm_validate_ns_entrypoint(pc))
+		if (arm_validate_ns_entrypoint(pc) != 0)
 			SMC_RET1(handle, STATE_SW_E_PARAM);
 
 		/*