4 files changed, 84 insertions, 28 deletions

diff --git a/lib/Kconfig b/lib/Kconfig
index cb9758e0ba0c..87da53bb1fef 100644
--- a/lib/Kconfig
+++ b/lib/Kconfig
@@ -23,7 +23,7 @@ config HAVE_ARCH_BITREVERSE
           have this capability.
 
 config RATIONAL
-        boolean
+        bool
 
 config GENERIC_STRNCPY_FROM_USER
         bool
@@ -48,14 +48,14 @@ config GENERIC_IOMAP
         select GENERIC_PCI_IOMAP
 
 config GENERIC_IO
-        boolean
+        bool
         default n
 
 config STMP_DEVICE
         bool
 
 config PERCPU_RWSEM
-        boolean
+        bool
 
 config ARCH_USE_CMPXCHG_LOCKREF
         bool
@@ -266,7 +266,7 @@ config DECOMPRESS_LZ4
 # Generic allocator support is selected if needed
 #
 config GENERIC_ALLOCATOR
-        boolean
+        bool
 
 #
 # reed solomon support is select'ed if needed
@@ -275,16 +275,16 @@ config REED_SOLOMON
         tristate
         
 config REED_SOLOMON_ENC8
-        boolean
+        bool
 
 config REED_SOLOMON_DEC8
-        boolean
+        bool
 
 config REED_SOLOMON_ENC16
-        boolean
+        bool
 
 config REED_SOLOMON_DEC16
-        boolean
+        bool
 
 #
 # BCH support is selected if needed
@@ -293,7 +293,7 @@ config BCH
         tristate
 
 config BCH_CONST_PARAMS
-        boolean
+        bool
         help
           Drivers may select this option to force specific constant
           values for parameters 'm' (Galois field order) and 't'
@@ -329,7 +329,7 @@ config BCH_CONST_T
 # Textsearch support is select'ed if needed
 #
 config TEXTSEARCH
-        boolean
+        bool
 
 config TEXTSEARCH_KMP
         tristate
@@ -341,10 +341,10 @@ config TEXTSEARCH_FSM
         tristate
 
 config BTREE
-        boolean
+        bool
 
 config INTERVAL_TREE
-        boolean
+        bool
         help
           Simple, embeddable, interval-tree. Can find the start of an
           overlapping range in log(n) time and then iterate over all
@@ -372,18 +372,18 @@ config ASSOCIATIVE_ARRAY
           for more information.
 
 config HAS_IOMEM
-        boolean
+        bool
         depends on !NO_IOMEM
         select GENERIC_IO
         default y
 
 config HAS_IOPORT_MAP
-        boolean
+        bool
         depends on HAS_IOMEM && !NO_IOPORT_MAP
         default y
 
 config HAS_DMA
-        boolean
+        bool
         depends on !NO_DMA
         default y
 
diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
index ecb3516f6546..c5cefb3c009c 100644
--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -167,6 +167,17 @@ config DEBUG_INFO_DWARF4
           But it significantly improves the success of resolving
           variables in gdb on optimized code.
 
+config GDB_SCRIPTS
+        bool "Provide GDB scripts for kernel debugging"
+        depends on DEBUG_INFO
+        help
+          This creates the required links to GDB helper scripts in the
+          build directory. If you load vmlinux into gdb, the helper
+          scripts will be automatically imported by gdb as well, and
+          additional functions are available to analyze a Linux kernel
+          instance. See Documentation/gdb-kernel-debugging.txt for further
+          details.
+
 config ENABLE_WARN_DEPRECATED
         bool "Enable __deprecated logic"
         default y
diff --git a/lib/lockref.c b/lib/lockref.c
index d2233de9a86e..ecb9a665ec19 100644
--- a/lib/lockref.c
+++ b/lib/lockref.c
@@ -60,7 +60,7 @@ void lockref_get(struct lockref *lockref)
 EXPORT_SYMBOL(lockref_get);
 
 /**
- * lockref_get_not_zero - Increments count unless the count is 0
+ * lockref_get_not_zero - Increments count unless the count is 0 or dead
  * @lockref: pointer to lockref structure
  * Return: 1 if count updated successfully or 0 if count was zero
  */
@@ -70,7 +70,7 @@ int lockref_get_not_zero(struct lockref *lockref)
 
         CMPXCHG_LOOP(
                 new.count++;
-                if (!old.count)
+                if (old.count <= 0)
                         return 0;
         ,
                 return 1;
@@ -78,7 +78,7 @@ int lockref_get_not_zero(struct lockref *lockref)
 
         spin_lock(&lockref->lock);
         retval = 0;
-        if (lockref->count) {
+        if (lockref->count > 0) {
                 lockref->count++;
                 retval = 1;
         }
@@ -88,7 +88,7 @@ int lockref_get_not_zero(struct lockref *lockref)
 EXPORT_SYMBOL(lockref_get_not_zero);
 
 /**
- * lockref_get_or_lock - Increments count unless the count is 0
+ * lockref_get_or_lock - Increments count unless the count is 0 or dead
  * @lockref: pointer to lockref structure
  * Return: 1 if count updated successfully or 0 if count was zero
  * and we got the lock instead.
@@ -97,14 +97,14 @@ int lockref_get_or_lock(struct lockref *lockref)
 {
         CMPXCHG_LOOP(
                 new.count++;
-                if (!old.count)
+                if (old.count <= 0)
                         break;
         ,
                 return 1;
         );
 
         spin_lock(&lockref->lock);
-        if (!lockref->count)
+        if (lockref->count <= 0)
                 return 0;
         lockref->count++;
         spin_unlock(&lockref->lock);
@@ -113,6 +113,26 @@ int lockref_get_or_lock(struct lockref *lockref)
 EXPORT_SYMBOL(lockref_get_or_lock);
 
 /**
+ * lockref_put_return - Decrement reference count if possible
+ * @lockref: pointer to lockref structure
+ *
+ * Decrement the reference count and return the new value.
+ * If the lockref was dead or locked, return an error.
+ */
+int lockref_put_return(struct lockref *lockref)
+{
+        CMPXCHG_LOOP(
+                new.count--;
+                if (old.count <= 0)
+                        return -1;
+        ,
+                return new.count;
+        );
+        return -1;
+}
+EXPORT_SYMBOL(lockref_put_return);
+
+/**
  * lockref_put_or_lock - decrements count unless count <= 1 before decrement
  * @lockref: pointer to lockref structure
  * Return: 1 if count updated successfully or 0 if count <= 1 and lock taken
@@ -158,7 +178,7 @@ int lockref_get_not_dead(struct lockref *lockref)
 
         CMPXCHG_LOOP(
                 new.count++;
-                if ((int)old.count < 0)
+                if (old.count < 0)
                         return 0;
         ,
                 return 1;
@@ -166,7 +186,7 @@ int lockref_get_not_dead(struct lockref *lockref)
 
         spin_lock(&lockref->lock);
         retval = 0;
-        if ((int) lockref->count >= 0) {
+        if (lockref->count >= 0) {
                 lockref->count++;
                 retval = 1;
         }
diff --git a/lib/pci_iomap.c b/lib/pci_iomap.c
index 0d83ea8a9605..bcce5f149310 100644
--- a/lib/pci_iomap.c
+++ b/lib/pci_iomap.c
@@ -10,10 +10,11 @@
 
 #ifdef CONFIG_PCI
 /**
- * pci_iomap - create a virtual mapping cookie for a PCI BAR
+ * pci_iomap_range - create a virtual mapping cookie for a PCI BAR
  * @dev: PCI device that owns the BAR
  * @bar: BAR number
- * @maxlen: length of the memory to map
+ * @offset: map memory at the given offset in BAR
+ * @maxlen: max length of the memory to map
  *
  * Using this function you will get a __iomem address to your device BAR.
  * You can access it using ioread*() and iowrite*(). These functions hide
@@ -21,16 +22,21 @@
  * you expect from them in the correct way.
  *
  * @maxlen specifies the maximum length to map. If you want to get access to
- * the complete BAR without checking for its length first, pass %0 here.
+ * the complete BAR from offset to the end, pass %0 here.
  * */
-void __iomem *pci_iomap(struct pci_dev *dev, int bar, unsigned long maxlen)
+void __iomem *pci_iomap_range(struct pci_dev *dev,
+                              int bar,
+                              unsigned long offset,
+                              unsigned long maxlen)
 {
         resource_size_t start = pci_resource_start(dev, bar);
         resource_size_t len = pci_resource_len(dev, bar);
         unsigned long flags = pci_resource_flags(dev, bar);
 
-        if (!len || !start)
+        if (len <= offset || !start)
                 return NULL;
+        len -= offset;
+        start += offset;
         if (maxlen && len > maxlen)
                 len = maxlen;
         if (flags & IORESOURCE_IO)
@@ -43,6 +49,25 @@ void __iomem *pci_iomap(struct pci_dev *dev, int bar, unsigned long maxlen)
         /* What? */
         return NULL;
 }
+EXPORT_SYMBOL(pci_iomap_range);
 
+/**
+ * pci_iomap - create a virtual mapping cookie for a PCI BAR
+ * @dev: PCI device that owns the BAR
+ * @bar: BAR number
+ * @maxlen: length of the memory to map
+ *
+ * Using this function you will get a __iomem address to your device BAR.
+ * You can access it using ioread*() and iowrite*(). These functions hide
+ * the details if this is a MMIO or PIO address space and will just do what
+ * you expect from them in the correct way.
+ *
+ * @maxlen specifies the maximum length to map. If you want to get access to
+ * the complete BAR without checking for its length first, pass %0 here.
+ * */
+void __iomem *pci_iomap(struct pci_dev *dev, int bar, unsigned long maxlen)
+{
+        return pci_iomap_range(dev, bar, 0, maxlen);
+}
 EXPORT_SYMBOL(pci_iomap);
 #endif /* CONFIG_PCI */