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Commit 10521bd9 authored by Robert P. J. Day's avatar Robert P. J. Day Committed by Linus Torvalds
Browse files

generalize asm-generic/ioctl.h to allow overriding values 



In the spirit of a number of other asm-generic header files,
generalize asm-generic/ioctl.h to allow arch-specific ioctl.h headers
to simply override _IOC_SIZEBITS and/or _IOC_DIRBITS before including
this header file, allowing a number of ioctl.h header files to be
shortened considerably.

Signed-off-by: default avatarRobert P. J. Day <rpjday@crashcourse.ca>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 098ef1c0

include/asm-generic/ioctl.h

+27 −6
Original line number Diff line number Diff line
@@ -21,8 +21,19 @@ 
 */

#define _IOC_NRBITS	8

#define _IOC_TYPEBITS	8



/*

 * Let any architecture override either of the following before

 * including this file.

 */



#ifndef _IOC_SIZEBITS

# define _IOC_SIZEBITS	14

#endif



#ifndef _IOC_DIRBITS

# define _IOC_DIRBITS	2

#endif



#define _IOC_NRMASK	((1 << _IOC_NRBITS)-1)

#define _IOC_TYPEMASK	((1 << _IOC_TYPEBITS)-1)
@@ -35,11 +46,21 @@ 
#define _IOC_DIRSHIFT	(_IOC_SIZESHIFT+_IOC_SIZEBITS)



/*

 * Direction bits.

 * Direction bits, which any architecture can choose to override

 * before including this file.

 */



#ifndef _IOC_NONE

# define _IOC_NONE	0U

#endif



#ifndef _IOC_WRITE

# define _IOC_WRITE	1U

#endif



#ifndef _IOC_READ

# define _IOC_READ	2U

#endif



#define _IOC(dir,type,nr,size) \

	(((dir)  << _IOC_DIRSHIFT) | \