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Many struct file_operations in the kernel can be "const". Marking them const moves these to the .rodata section, which avoids false sharing with potential dirty data. In addition it'll catch accidental writes at compile time to these shared resources. Signed-off-by: Arjan van de Ven <arjan@linux.intel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
62 lines
1.6 KiB
C
62 lines
1.6 KiB
C
/*
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* (C) Copyright IBM Corp. 2004 All Rights Reserved.
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* tape_class.h
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*
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* Tape class device support
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*
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* Author: Stefan Bader <shbader@de.ibm.com>
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* Based on simple class device code by Greg K-H
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*/
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#ifndef __TAPE_CLASS_H__
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#define __TAPE_CLASS_H__
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/fs.h>
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#include <linux/major.h>
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#include <linux/kobject.h>
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#include <linux/kobj_map.h>
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#include <linux/cdev.h>
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#include <linux/device.h>
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#include <linux/kdev_t.h>
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#define TAPECLASS_NAME_LEN 32
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struct tape_class_device {
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struct cdev * char_device;
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struct class_device * class_device;
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char device_name[TAPECLASS_NAME_LEN];
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char mode_name[TAPECLASS_NAME_LEN];
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};
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/*
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* Register a tape device and return a pointer to the tape class device
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* created by the call.
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*
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* device
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* The pointer to the struct device of the physical (base) device.
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* dev
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* The intended major/minor number. The major number may be 0 to
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* get a dynamic major number.
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* fops
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* The pointer to the drivers file operations for the tape device.
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* device_name
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* Pointer to the logical device name (will also be used as kobject name
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* of the cdev). This can also be called the name of the tape class
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* device.
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* mode_name
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* Points to the name of the tape mode. This creates a link with that
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* name from the physical device to the logical device (class).
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*/
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struct tape_class_device *register_tape_dev(
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struct device * device,
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dev_t dev,
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const struct file_operations *fops,
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char * device_name,
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char * node_name
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);
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void unregister_tape_dev(struct tape_class_device *tcd);
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#endif /* __TAPE_CLASS_H__ */
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