X-Git-Url: https://jxself.org/git/?a=blobdiff_plain;f=include%2Flinux%2Fcompiler.h;h=e3390d2682395eaeb11be84ecd40bb7e46aafe64;hb=HEAD;hp=fe04cc6f9bfb7181ffc365d99bd634845da62c6a;hpb=e72388a0aa23da8bc8e24a0cbe9d523c5a9ce294;p=carl9170fw.git

diff --git a/include/linux/compiler.h b/include/linux/compiler.h
index fe04cc6..e3390d2 100644
--- a/include/linux/compiler.h
+++ b/include/linux/compiler.h
@@ -17,14 +17,16 @@
 #ifndef __SHARED_COMPILER_H
 #define __SHARED_COMPILER_H
 
-#define __noinline	__attribute__((noinline))
+#define __noreturn	__attribute__((noreturn))
 #define __inline	__attribute__((always_inline))
 #define __hot		__attribute__((hot))
 #define __cold		__attribute__((cold))
-#define __unused	__attribute__((unused))
 #define __force		__attribute__((force))
-#define __section(s)	__attribute__((section("." # s)))
-#define __packed	__attribute__((packed))
+#define __in_section(s)	__attribute__((section("." # s)))
+#define __visible	__attribute__((externally_visible))
+
+#define DIV_ROUND_UP(n, d) (((n) + (d) - 1) / (d))
+
 
 #define BUILD_BUG_ON(condition)	((void)sizeof(char[1 - 2*!!(condition)]))
 #define BUILD_BUG_ON_ZERO(e) (sizeof(char[1 - 2 * !!(e)]) - 1)
@@ -41,6 +43,42 @@
 #define BIT(b)			(1 << (b))
 #define MASK(w)			(BIT(w) - 1)
 
+/**
+ * __struct_group() - Create a mirrored named and anonyomous struct
+ *
+ * @TAG: The tag name for the named sub-struct (usually empty)
+ * @NAME: The identifier name of the mirrored sub-struct
+ * @ATTRS: Any struct attributes (usually empty)
+ * @MEMBERS: The member declarations for the mirrored structs
+ *
+ * Used to create an anonymous union of two structs with identical layout
+ * and size: one anonymous and one named. The former's members can be used
+ * normally without sub-struct naming, and the latter can be used to
+ * reason about the start, end, and size of the group of struct members.
+ * The named struct can also be explicitly tagged for layer reuse, as well
+ * as both having struct attributes appended.
+ */
+#define __struct_group(TAG, NAME, ATTRS, MEMBERS...) \
+	union { \
+		struct { MEMBERS } ATTRS; \
+		struct TAG { MEMBERS } ATTRS NAME; \
+	}
+
+/**
+ * struct_group() - Wrap a set of declarations in a mirrored struct
+ *
+ * @NAME: The identifier name of the mirrored sub-struct
+ * @MEMBERS: The member declarations for the mirrored structs
+ *
+ * Used to create an anonymous union of two structs with identical
+ * layout and size: one anonymous and one named. The former can be
+ * used normally without sub-struct naming, and the latter can be
+ * used to reason about the start, end, and size of the group of
+ * struct members.
+ */
+#define struct_group(NAME, MEMBERS...)  \
+	__struct_group(/* no tag */, NAME, /* no attrs */, MEMBERS)
+
 #undef offsetof
 #ifdef __compiler_offsetof
 # define offsetof(TYPE, MEMBER) __compiler_offsetof(TYPE, MEMBER)
@@ -48,6 +86,23 @@
 # define offsetof(TYPE, MEMBER) ((size_t) &((TYPE *)0)->MEMBER)
 #endif
 
+/**
+ * sizeof_field() - Report the size of a struct field in bytes
+ *
+ * @TYPE: The structure containing the field of interest
+ * @MEMBER: The field to return the size of
+ */
+#define sizeof_field(TYPE, MEMBER) sizeof((((TYPE *)0)->MEMBER))
+
+/**
+ * offsetofend() - Report the offset of a struct field within the struct
+ *
+ * @TYPE: The type of the structure
+ * @MEMBER: The member within the structure to get the end offset of
+ */
+#define offsetofend(TYPE, MEMBER) \
+	(offsetof(TYPE, MEMBER) + sizeof_field(TYPE, MEMBER))
+
 #define likely(x)	__builtin_expect(!!(x), 1)
 #define unlikely(x)	__builtin_expect(!!(x), 0)
 
@@ -76,7 +131,7 @@
 
 #define container_of(ptr, type, member) ({			\
 	const typeof(((type *)0)->member) * __mptr = (ptr);	\
-	(type *)((char *)__mptr - offsetof(type, member)); })
+	(type *)(((unsigned long)__mptr - offsetof(type, member))); })
 
 #define MAX_ERRNO	4095
 
@@ -102,4 +157,93 @@ static inline long IS_ERR_OR_NULL(const void *ptr)
 	return !ptr || IS_ERR_VALUE((unsigned long)ptr);
 }
 
+static inline unsigned int hweight8(unsigned int w)
+{
+        unsigned int res = w - ((w >> 1) & 0x55);
+        res = (res & 0x33) + ((res >> 2) & 0x33);
+        return (res + (res >> 4)) & 0x0F;
+}
+
+static inline unsigned int hweight16(unsigned int w)
+{
+        unsigned int res = w - ((w >> 1) & 0x5555);
+        res = (res & 0x3333) + ((res >> 2) & 0x3333);
+        res = (res + (res >> 4)) & 0x0F0F;
+        return (res + (res >> 8)) & 0x00FF;
+}
+
+/**
+ * DECLARE_FLEX_ARRAY() - Declare a flexible array usable in a union
+ *
+ * @TYPE: The type of each flexible array element
+ * @NAME: The name of the flexible array member
+ *
+ * In order to have a flexible array member in a union or alone in a
+ * struct, it needs to be wrapped in an anonymous struct with at least 1
+ * named member, but that member can be empty.
+ */
+#define DECLARE_FLEX_ARRAY(TYPE, NAME)	\
+	struct { \
+		struct { } __empty_ ## NAME; \
+		TYPE NAME[]; \
+	}
+
+#define __bf_shf(x) (__builtin_ffsll(x) - 1)
+
+#define FIELD_MAX(_mask)                                                \
+        ({                                                              \
+                (typeof(_mask))((_mask) >> __bf_shf(_mask));            \
+        })
+
+#if __has_attribute(__error__)
+# define __compiletime_error(msg)       __attribute__((__error__(msg)))
+#else
+# define __compiletime_error(msg)
+#endif
+
+extern void __compiletime_error("value doesn't fit into mask")
+__field_overflow(void);
+extern void __compiletime_error("bad bitfield mask")
+__bad_mask(void);
+static inline u64 field_multiplier(u32 field)
+{
+	if ((field | (field - 1)) & ((field | (field - 1)) + 1))
+		__bad_mask();
+	return field & -field;
+}
+static inline u64 field_mask(const u32 field)
+{
+	return field / field_multiplier(field);
+}
+#define field_max(field)	((typeof(field))field_mask(field))
+#define ____MAKE_OP(type,base,to,from)					\
+static inline __##type type##_encode_bits(base v, base field)	\
+{									\
+	if (__builtin_constant_p(v) && (v & ~field_mask(field)))	\
+		__field_overflow();					\
+	return to((v & field_mask(field)) * field_multiplier(field));	\
+}									\
+static inline __##type type##_replace_bits(__##type old,	\
+					base val, base field)		\
+{									\
+	return (old & ~to(field)) | type##_encode_bits(val, field);	\
+}									\
+static inline void type##p_replace_bits(__##type *p,		\
+					base val, base field)		\
+{									\
+	*p = (*p & ~to(field)) | type##_encode_bits(val, field);	\
+}									\
+static inline base type##_get_bits(__##type v, base field)	\
+{									\
+	return (from(v) & field)/field_multiplier(field);		\
+}
+#define __MAKE_OP(size)							\
+	____MAKE_OP(le##size,u##size,cpu_to_le##size,le##size##_to_cpu)	\
+	____MAKE_OP(u##size,u##size,,)
+____MAKE_OP(u8,u8,,)
+__MAKE_OP(16)
+__MAKE_OP(32)
+#undef __MAKE_OP
+#undef ____MAKE_OP
+
 #endif /* __SHARED_COMPILER_H */