Merge tag 'f2fs-for-4.18' of git://git.kernel.org/pub/scm/linux/kernel/git/jaegeuk...

[sfrench/cifs-2.6.git] / include / linux / kernel.h

diff --git a/include/linux/kernel.h b/include/linux/kernel.h
index 7aed926245311e228cc653a6a8bb926b1add961d..d231232385349146faf64c42cd05a73bddd0fcca 100644 (file)
--- a/include/linux/kernel.h
+++ b/include/linux/kernel.h
@@ -29,6 +29,7 @@
 #define LLONG_MIN      (-LLONG_MAX - 1)
 #define ULLONG_MAX     (~0ULL)
 #define SIZE_MAX       (~(size_t)0)
+#define PHYS_ADDR_MAX  (~(phys_addr_t)0)
 
 #define U8_MAX         ((u8)~0U)
 #define S8_MAX         ((s8)(U8_MAX>>1))
@@ -965,6 +966,22 @@ static inline void ftrace_dump(enum ftrace_dump_mode oops_dump_mode) { }
                         "pointer type mismatch in container_of()");    \
        ((type *)(__mptr - offsetof(type, member))); })
 
+/**
+ * container_of_safe - cast a member of a structure out to the containing structure
+ * @ptr:       the pointer to the member.
+ * @type:      the type of the container struct this is embedded in.
+ * @member:    the name of the member within the struct.
+ *
+ * If IS_ERR_OR_NULL(ptr), ptr is returned unchanged.
+ */
+#define container_of_safe(ptr, type, member) ({                                \
+       void *__mptr = (void *)(ptr);                                   \
+       BUILD_BUG_ON_MSG(!__same_type(*(ptr), ((type *)0)->member) &&   \
+                        !__same_type(*(ptr), void),                    \
+                        "pointer type mismatch in container_of()");    \
+       IS_ERR_OR_NULL(__mptr) ? ERR_CAST(__mptr) :                     \
+               ((type *)(__mptr - offsetof(type, member))); })
+
 /* Rebuild everything on CONFIG_FTRACE_MCOUNT_RECORD */
 #ifdef CONFIG_FTRACE_MCOUNT_RECORD
 # define REBUILD_DUE_TO_FTRACE_MCOUNT_RECORD