LU-9859 libcfs: prepare for switch to container_of_safe()

[fs/lustre-release.git] / libcfs / include / libcfs / linux / linux-misc.h

diff --git a/libcfs/include/libcfs/linux/linux-misc.h b/libcfs/include/libcfs/linux/linux-misc.h
index 1e45e8f..ab1e2ff 100644 (file)
--- a/libcfs/include/libcfs/linux/linux-misc.h
+++ b/libcfs/include/libcfs/linux/linux-misc.h
@@ -85,10 +85,33 @@ static inline void kernel_param_lock(struct module *mod)
 }
 #endif /* ! HAVE_KERNEL_PARAM_LOCK */
 
+int cfs_apply_workqueue_attrs(struct workqueue_struct *wq,
+                             const struct workqueue_attrs *attrs);
+
 #ifndef HAVE_KSTRTOBOOL_FROM_USER
 
 #define kstrtobool strtobool
 
 int kstrtobool_from_user(const char __user *s, size_t count, bool *res);
+#endif /* HAVE_KSTRTOBOOL_FROM_USER */
+
+void cfs_arch_init(void);
+
+#ifndef container_of_safe
+/**
+ * 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.
+ *
+ * Note: Copied from Linux 5.6, with BUILD_BUG_ON_MSG section removed.
+ */
+#define container_of_safe(ptr, type, member) ({                                \
+       void *__mptr = (void *)(ptr);                                   \
+       IS_ERR_OR_NULL(__mptr) ? ERR_CAST(__mptr) :                     \
+               ((type *)(__mptr - offsetof(type, member))); })
 #endif
-#endif
+
+#endif /* __LIBCFS_LINUX_MISC_H__ */