+/**
+ * __set_bit - Set a bit in memory
+ * @nr: the bit to set
+ * @addr: the address to start counting from
+ *
+ * Unlike set_bit(), this function is non-atomic and may be reordered.
+ * If it's called on the same region of memory simultaneously, the effect
+ * may be that only one operation succeeds.
+ */
+static inline void __set_bit(int nr, volatile unsigned long *addr)
+{
+ unsigned long mask = BITOP_MASK(nr);
+ unsigned long *p = ((unsigned long *)addr) + BITOP_WORD(nr);
+
+ *p |= mask;
+}
+
+static inline void __clear_bit(int nr, volatile unsigned long *addr)
+{
+ unsigned long mask = BITOP_MASK(nr);
+ unsigned long *p = ((unsigned long *)addr) + BITOP_WORD(nr);
+
+ *p &= ~mask;
+}
+
+/**
+ * test_bit - Determine whether a bit is set
+ * @nr: bit number to test
+ * @addr: Address to start counting from
+ */
+static inline int test_bit(int nr, const volatile unsigned long *addr)
+{
+ return 1UL & (addr[BITOP_WORD(nr)] >> (nr & (BITS_PER_LONG-1)));
+}
+
+/*
+ * error pointer
+ */
+#define MAX_ERRNO 4095
+#define IS_ERR_VALUE(x) ((x) >= (unsigned long)-MAX_ERRNO)
+
+static inline void *ERR_PTR(long error)
+{
+ return (void *) error;
+}
+
+static inline long PTR_ERR(const void *ptr)
+{
+ return (long) ptr;
+}
+
+static inline int IS_ERR(const void *ptr)
+{
+ return IS_ERR_VALUE((unsigned long)ptr);
+}
+
+static inline int IS_ERR_OR_NULL(const void *ptr)
+{
+ return !ptr || IS_ERR(ptr);
+}
+
+/*
+ * This looks more complex than it should be. But we need to
+ * get the type for the ~ right in round_down (it needs to be
+ * as wide as the result!), and we want to evaluate the macro
+ * arguments just once each.
+ */
+#define __round_mask(x, y) ((__typeof__(x))((y)-1))
+#define round_up(x, y) ((((x)-1) | __round_mask(x, y))+1)
+#define round_down(x, y) ((x) & ~__round_mask(x, y))
+
+/*
+ * printk
+ */
+#define printk(fmt, args...) fprintf(stderr, fmt, ##args)
+#define KERN_CRIT ""
+#define KERN_ERR ""
+
+/*
+ * kmalloc/kfree
+ */
+#define kmalloc(x, y) malloc(x)
+#define kzalloc(x, y) calloc(1, x)
+#define kstrdup(x, y) strdup(x)
+#define kfree(x) free(x)
+#define vmalloc(x) malloc(x)
+#define vfree(x) free(x)
+
+#ifndef BTRFS_DISABLE_BACKTRACE
+static inline void assert_trace(const char *assertion, const char *filename,
+ const char *func, unsigned line, long val)
+{
+ if (val)
+ return;
+ fprintf(stderr,
+ "%s:%d: %s: Assertion `%s` failed, value %ld\n",
+ filename, line, func, assertion, val);
+#ifndef BTRFS_DISABLE_BACKTRACE
+ print_trace();
+#endif
+ abort();
+ exit(1);
+}
+#define ASSERT(c) assert_trace(#c, __FILE__, __func__, __LINE__, (long)(c))
+#else
+#define ASSERT(c) assert(c)
+#endif
+
+#define BUG_ON(c) bugon_trace(#c, __FILE__, __func__, __LINE__, (long)(c))
+#define BUG() BUG_ON(1)
+#define WARN_ON(c) warning_trace(#c, __FILE__, __func__, __LINE__, (long)(c))
+
+#define container_of(ptr, type, member) ({ \
+ const typeof( ((type *)0)->member ) *__mptr = (ptr); \
+ (type *)( (char *)__mptr - offsetof(type,member) );})
+#ifndef __bitwise
+#ifdef __CHECKER__