Add more clang-tidy checks.

This adds all the generic checks. There are some more project specific
ones that could be selected but this is a good start and has already
found some lint errors.

Change-Id: I7bb9d9347f5270862c2ff586eb7c86feead9e4bb
diff --git a/src/arch/aarch64/handler.c b/src/arch/aarch64/handler.c
index 8999403..94a9722 100644
--- a/src/arch/aarch64/handler.c
+++ b/src/arch/aarch64/handler.c
@@ -52,6 +52,8 @@
 struct hvc_handler_return hvc_handler(size_t arg0, size_t arg1, size_t arg2,
 				      size_t arg3)
 {
+	(void)arg3;
+
 	struct hvc_handler_return ret;
 
 	ret.new = NULL;
diff --git a/src/arch/aarch64/mm.c b/src/arch/aarch64/mm.c
index d4898d4..f5dcdf1 100644
--- a/src/arch/aarch64/mm.c
+++ b/src/arch/aarch64/mm.c
@@ -43,7 +43,7 @@
 #define STAGE2_WRITETHROUGH 2ull
 #define STAGE2_WRITEBACK    3ull
 
-#define STAGE2_MEMATTR_NORMAL(outer, inner) ((outer << 2) | (inner))
+#define STAGE2_MEMATTR_NORMAL(outer, inner) (((outer) << 2) | (inner))
 
 /* The following stage-2 memory attributes for device memory. */
 #define STAGE2_MEMATTR_DEVICE_nGnRnE 0ull
diff --git a/src/arch/aarch64/msr.h b/src/arch/aarch64/msr.h
index 30916db..277ccea 100644
--- a/src/arch/aarch64/msr.h
+++ b/src/arch/aarch64/msr.h
@@ -10,9 +10,11 @@
 		__v;                                          \
 	})
 
-#define write_msr(name, value)                                                \
-	do {                                                                  \
-		__asm volatile("msr " #name ", %x0" : : "rZ"((size_t)value)); \
+#define write_msr(name, value)                           \
+	do {                                             \
+		__asm volatile("msr " #name ", %x0"      \
+			       :                         \
+			       : "rZ"((size_t)(value))); \
 	} while (0)
 
 #endif /* _MSR_H */
diff --git a/src/dlog.c b/src/dlog.c
index 38ccc85..5382096 100644
--- a/src/dlog.c
+++ b/src/dlog.c
@@ -163,7 +163,7 @@
 /*
  * Prints the given format string to the debug log.
  */
-void dlog(const char *str, ...)
+void dlog(const char *fmt, ...)
 {
 	static struct spinlock sl = SPINLOCK_INIT;
 	const char *p;
@@ -172,11 +172,11 @@
 	int flags;
 	char buf[2];
 
-	va_start(args, str);
+	va_start(args, fmt);
 
 	sl_lock(&sl);
 
-	for (p = str; *p; p++) {
+	for (p = fmt; *p; p++) {
 		switch (*p) {
 		default:
 			arch_putchar(*p);
diff --git a/src/main.c b/src/main.c
index a23c7e8..e4957fd 100644
--- a/src/main.c
+++ b/src/main.c
@@ -280,7 +280,7 @@
 	}
 
 	/* Fail if it's not a number. */
-	if (*it->next < '0' && *it->next > '9') {
+	if (*it->next < '0' || *it->next > '9') {
 		return false;
 	}
 
diff --git a/src/mm.c b/src/mm.c
index 8942ec5..6662bae 100644
--- a/src/mm.c
+++ b/src/mm.c
@@ -105,6 +105,9 @@
  */
 static void mm_free_page_pte(pte_t pte, int level, bool sync)
 {
+	(void)pte;
+	(void)level;
+	(void)sync;
 	/* TODO: Implement.
 	if (!arch_mm_pte_is_present(pte) || level < 1)
 		return;
@@ -309,6 +312,7 @@
 void mm_ptable_defrag(struct mm_ptable *t)
 {
 	/* TODO: Implement. */
+	(void)t;
 }
 
 /**