scons: Enable -Wextra by default

Make best use of the compiler, and enable -Wextra as well as
-Wall. There are a few issues that had to be resolved, but they are
all trivial.

7 files changed, 11 insertions, 8 deletions

diff --git a/src/dev/arm/hdlcd.hh b/src/dev/arm/hdlcd.hh
index 3ce12a24d..721935457 100644
--- a/src/dev/arm/hdlcd.hh
+++ b/src/dev/arm/hdlcd.hh
@@ -316,7 +316,7 @@ class HDLcd: public AmbaDmaDevice
     }
 
     /** Masked interrupt status register */
-    const uint32_t intStatus() const { return int_rawstat & int_mask; }
+    uint32_t intStatus() const { return int_rawstat & int_mask; }
 
   protected: // Pixel output
     class PixelPump : public BasePixelPump
diff --git a/src/dev/arm/pl011.hh b/src/dev/arm/pl011.hh
index 936dd81ed..e19c74fa2 100644
--- a/src/dev/arm/pl011.hh
+++ b/src/dev/arm/pl011.hh
@@ -110,7 +110,7 @@ class Pl011 : public Uart, public AmbaDevice
     void clearInterrupts(uint16_t ints) { setInterrupts(rawInt & ~ints, imsc); }
 
     /** Masked interrupt status register */
-    const inline uint16_t maskInt() const { return rawInt & imsc; }
+    inline uint16_t maskInt() const { return rawInt & imsc; }
 
     /** Wrapper to create an event out of the thing */
     EventWrapper<Pl011, &Pl011::generateInterrupt> intEvent;
diff --git a/src/dev/net/ethertap.cc b/src/dev/net/ethertap.cc
index e8d6a363c..e8ece152e 100644
--- a/src/dev/net/ethertap.cc
+++ b/src/dev/net/ethertap.cc
@@ -241,8 +241,8 @@ EtherTap::process(int revent)
         packet->length = data_len;
         memcpy(packet->data, data, data_len);
 
+        assert(buffer_offset >= data_len + sizeof(uint32_t));
         buffer_offset -= data_len + sizeof(uint32_t);
-        assert(buffer_offset >= 0);
         if (buffer_offset > 0) {
             memmove(buffer, data + data_len, buffer_offset);
             data_len = ntohl(*(uint32_t *)buffer);
diff --git a/src/dev/net/ns_gige_reg.h b/src/dev/net/ns_gige_reg.h
index c37c06aed..4cecbb158 100644
--- a/src/dev/net/ns_gige_reg.h
+++ b/src/dev/net/ns_gige_reg.h
@@ -93,6 +93,7 @@ enum ChipCommandRegister {
 
 /* configuration register */
 enum ConfigurationRegisters {
+     CFGR_ZERO =        0x00000000,
      CFGR_LNKSTS =      0x80000000,
      CFGR_SPDSTS =      0x60000000,
      CFGR_SPDSTS1 =     0x40000000,
@@ -395,7 +396,7 @@ static inline int
 SPDSTS_POLARITY(int lnksts)
 {
     return (CFGR_SPDSTS1 | CFGR_SPDSTS0 | CFGR_DUPSTS |
-            (lnksts ? CFGR_LNKSTS : 0));
+            (lnksts ? CFGR_LNKSTS : CFGR_ZERO));
 }
 
 #endif /* __DEV_NS_GIGE_REG_H__ */
diff --git a/src/dev/net/pktfifo.hh b/src/dev/net/pktfifo.hh
index 5ef75423c..456c4433b 100644
--- a/src/dev/net/pktfifo.hh
+++ b/src/dev/net/pktfifo.hh
@@ -106,8 +106,8 @@ class PacketFifo
     unsigned
     reserve(unsigned len = 0)
     {
+        assert(avail() >= len);
         _reserved += len;
-        assert(avail() >= 0);
         return _reserved;
     }
 
diff --git a/src/dev/sparc/iob.cc b/src/dev/sparc/iob.cc
index c8462b9be..55cb93f37 100644
--- a/src/dev/sparc/iob.cc
+++ b/src/dev/sparc/iob.cc
@@ -91,7 +91,8 @@ Iob::readIob(PacketPtr pkt)
 {
         Addr accessAddr = pkt->getAddr() - iobManAddr;
 
-        if (accessAddr >= IntManAddr && accessAddr < IntManAddr + IntManSize) {
+        assert(IntManAddr == 0);
+        if (accessAddr < IntManAddr + IntManSize) {
             int index = (accessAddr - IntManAddr) >> 3;
             uint64_t data = intMan[index].cpu << 8 | intMan[index].vector << 0;
             pkt->set(data);
@@ -186,7 +187,8 @@ Iob::writeIob(PacketPtr pkt)
         int index;
         uint64_t data;
 
-        if (accessAddr >= IntManAddr && accessAddr < IntManAddr + IntManSize) {
+        assert(IntManAddr == 0);
+        if (accessAddr < IntManAddr + IntManSize) {
             index = (accessAddr - IntManAddr) >> 3;
             data = pkt->get<uint64_t>();
             intMan[index].cpu = bits(data,12,8);
diff --git a/src/dev/terminal.cc b/src/dev/terminal.cc
index e653ee115..6db43ef88 100644
--- a/src/dev/terminal.cc
+++ b/src/dev/terminal.cc
@@ -249,7 +249,7 @@ Terminal::read(uint8_t *buf, size_t len)
     if (data_fd < 0)
         panic("Terminal not properly attached.\n");
 
-    size_t ret;
+    ssize_t ret;
     do {
       ret = ::read(data_fd, buf, len);
     } while (ret == -1 && errno == EINTR);