Enable -Wlogical-op always

-Wlogical-op prevents common errors with using numerical constants where
a boolean one is expected as well as when the operands of a logical
operator are the same. While these are perfectly valid behavior, they
can be a sign that something is slightly off.

This patch adds this warning to gcc and it's closest equivalent to
clang, while also fixing any warnings that enabling them causes.

Change-Id: Iabadfc1e6ee0c44eef6685a23b0aed8abef8ce89
Signed-off-by: Justin Chadwell <justin.chadwell@arm.com>

Makefile

@@ -246,7 +246,6 @@ WARNING1 += -Wunused-const-variable
 WARNING2 := -Waggregate-return
 WARNING2 += -Wcast-align
 WARNING2 += -Wnested-externs
-WARNING2 += -Wlogical-op
 
 WARNING3 := -Wbad-function-cast
 WARNING3 += -Wcast-qual
@@ -268,13 +267,13 @@ endif
 # Compiler specific warnings
 ifeq ($(findstring clang,$(notdir $(CC))),)
 # not using clang
-WARNINGS	+=		-Wunused-but-set-variable	\
-				-Wmaybe-uninitialized		\
-				-Wpacked-bitfield-compat	\
-				-Wshift-overflow=2
+WARNINGS	+=		-Wunused-but-set-variable -Wmaybe-uninitialized	\
+				-Wpacked-bitfield-compat -Wshift-overflow=2 \
+				-Wlogical-op
 else
 # using clang
-WARNINGS	+=		-Wshift-overflow -Wshift-sign-overflow
+WARNINGS	+=		-Wshift-overflow -Wshift-sign-overflow \
+				-Wlogical-op-parentheses
 endif
 
 ifneq (${E},0)

drivers/mentor/i2c/mi2cv.c

@@ -81,14 +81,14 @@ static void mentor_i2c_interrupt_clear(void)
 	udelay(1);
 }
 
-static int mentor_i2c_interrupt_get(void)
+static bool mentor_i2c_interrupt_get(void)
 {
 	uint32_t reg;
 
 	/* get the interrupt flag bit */
 	reg = mmio_read_32((uintptr_t)&base->control);
 	reg &= I2C_CONTROL_IFLG;
-	return reg && I2C_CONTROL_IFLG;
+	return (reg != 0U);
 }
 
 static int mentor_i2c_wait_interrupt(void)

plat/xilinx/zynqmp/pm_service/pm_api_ioctl.c

@@ -58,7 +58,7 @@ static enum pm_ret_status pm_ioctl_set_rpu_oper_mode(unsigned int mode)
 {
 	unsigned int val;
 
-	if (mmio_read_32(CRL_APB_RST_LPD_TOP) && CRL_APB_RPU_AMBA_RESET)
+	if (mmio_read_32(CRL_APB_RST_LPD_TOP) & CRL_APB_RPU_AMBA_RESET)
 		return PM_RET_ERROR_ACCESS;
 
 	val = mmio_read_32(ZYNQMP_RPU_GLBL_CNTL);