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idr_replace(9) [centos man page]

IDR_REPLACE(9)						  Basic Kernel Library Functions					    IDR_REPLACE(9)

idr_replace - replace pointer for given id SYNOPSIS
void * idr_replace(struct idr * idp, void * ptr, int id); ARGUMENTS
idp idr handle ptr pointer you want associated with the id id lookup key DESCRIPTION
Replace the pointer registered with an id and return the old value. A -ENOENT return indicates that id was not found. A -EINVAL return indicates that id was not within valid constraints. The caller must serialize with writers. COPYRIGHT
Kernel Hackers Manual 3.10 June 2014 IDR_REPLACE(9)

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DEBUGFS_CREATE_FILE(9)					      The debugfs filesystem					    DEBUGFS_CREATE_FILE(9)

debugfs_create_file - create a file in the debugfs filesystem SYNOPSIS
struct dentry * debugfs_create_file(const char * name, umode_t mode, struct dentry * parent, void * data, const struct file_operations * fops); ARGUMENTS
name a pointer to a string containing the name of the file to create. mode the permission that the file should have. parent a pointer to the parent dentry for this file. This should be a directory dentry if set. If this paramater is NULL, then the file will be created in the root of the debugfs filesystem. data a pointer to something that the caller will want to get to later on. The inode.i_private pointer will point to this value on the open call. fops a pointer to a struct file_operations that should be used for this file. DESCRIPTION
This is the basic "create a file" function for debugfs. It allows for a wide range of flexibility in creating a file, or a directory (if you want to create a directory, the debugfs_create_dir function is recommended to be used instead.) This function will return a pointer to a dentry if it succeeds. This pointer must be passed to the debugfs_remove function when the file is to be removed (no automatic cleanup happens if your module is unloaded, you are responsible here.) If an error occurs, NULL will be returned. If debugfs is not enabled in the kernel, the value -ENODEV will be returned. COPYRIGHT
Kernel Hackers Manual 3.10 June 2014 DEBUGFS_CREATE_FILE(9)
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