diff --git a/arch/arm/bits/ioctl.h b/arch/arm/bits/ioctl.h
index 336c71c30272f84bdbfaff1f23c700d811ded351..9d75118e0ef7a51a67fc4b09cb4d49612ab285dd 100644
--- a/arch/arm/bits/ioctl.h
+++ b/arch/arm/bits/ioctl.h
@@ -4,9 +4,9 @@
 #define _IOC_READ  2U
 
 #define _IO(a,b) _IOC(_IOC_NONE,(a),(b),0)
-#define _IOW(a,b,c) _IOC(1,(a),(b),sizeof(c))
-#define _IOR(a,b,c) _IOC(2,(a),(b),sizeof(c))
-#define _IOWR(a,b,c) _IOC(3,(a),(b),sizeof(c))
+#define _IOW(a,b,c) _IOC(_IOC_WRITE,(a),(b),sizeof(c))
+#define _IOR(a,b,c) _IOC(_IOC_READ,(a),(b),sizeof(c))
+#define _IOWR(a,b,c) _IOC(_IOC_READ|_IOC_WRITE,(a),(b),sizeof(c))
 
 #define TCGETS		0x5401
 #define TCSETS		0x5402
diff --git a/arch/i386/bits/ioctl.h b/arch/i386/bits/ioctl.h
index 336c71c30272f84bdbfaff1f23c700d811ded351..9d75118e0ef7a51a67fc4b09cb4d49612ab285dd 100644
--- a/arch/i386/bits/ioctl.h
+++ b/arch/i386/bits/ioctl.h
@@ -4,9 +4,9 @@
 #define _IOC_READ  2U
 
 #define _IO(a,b) _IOC(_IOC_NONE,(a),(b),0)
-#define _IOW(a,b,c) _IOC(1,(a),(b),sizeof(c))
-#define _IOR(a,b,c) _IOC(2,(a),(b),sizeof(c))
-#define _IOWR(a,b,c) _IOC(3,(a),(b),sizeof(c))
+#define _IOW(a,b,c) _IOC(_IOC_WRITE,(a),(b),sizeof(c))
+#define _IOR(a,b,c) _IOC(_IOC_READ,(a),(b),sizeof(c))
+#define _IOWR(a,b,c) _IOC(_IOC_READ|_IOC_WRITE,(a),(b),sizeof(c))
 
 #define TCGETS		0x5401
 #define TCSETS		0x5402
diff --git a/arch/microblaze/bits/ioctl.h b/arch/microblaze/bits/ioctl.h
index 336c71c30272f84bdbfaff1f23c700d811ded351..9d75118e0ef7a51a67fc4b09cb4d49612ab285dd 100644
--- a/arch/microblaze/bits/ioctl.h
+++ b/arch/microblaze/bits/ioctl.h
@@ -4,9 +4,9 @@
 #define _IOC_READ  2U
 
 #define _IO(a,b) _IOC(_IOC_NONE,(a),(b),0)
-#define _IOW(a,b,c) _IOC(1,(a),(b),sizeof(c))
-#define _IOR(a,b,c) _IOC(2,(a),(b),sizeof(c))
-#define _IOWR(a,b,c) _IOC(3,(a),(b),sizeof(c))
+#define _IOW(a,b,c) _IOC(_IOC_WRITE,(a),(b),sizeof(c))
+#define _IOR(a,b,c) _IOC(_IOC_READ,(a),(b),sizeof(c))
+#define _IOWR(a,b,c) _IOC(_IOC_READ|_IOC_WRITE,(a),(b),sizeof(c))
 
 #define TCGETS		0x5401
 #define TCSETS		0x5402
diff --git a/arch/mips/bits/ioctl.h b/arch/mips/bits/ioctl.h
index 5040226c2c4c55968d9d14320f9256469b7b9d55..83fb16785b951f53413b26a0235aa07b1c2eed31 100644
--- a/arch/mips/bits/ioctl.h
+++ b/arch/mips/bits/ioctl.h
@@ -3,10 +3,10 @@
 #define _IOC_READ  2U
 #define _IOC_WRITE 4U
 
-#define _IO(a,b) _IOC(1U,(a),(b),0)
-#define _IOW(a,b,c) _IOC(4U,(a),(b),sizeof(c))
-#define _IOR(a,b,c) _IOC(2U,(a),(b),sizeof(c))
-#define _IOWR(a,b,c) _IOC(6U,(a),(b),sizeof(c))
+#define _IO(a,b) _IOC(_IOC_NONE,(a),(b),0)
+#define _IOW(a,b,c) _IOC(_IOC_WRITE,(a),(b),sizeof(c))
+#define _IOR(a,b,c) _IOC(_IOC_READ,(a),(b),sizeof(c))
+#define _IOWR(a,b,c) _IOC(_IOC_READ|_IOC_WRITE,(a),(b),sizeof(c))
 
 #define TCGETA		0x5401
 #define TCSETA		0x5402
diff --git a/arch/powerpc/bits/ioctl.h b/arch/powerpc/bits/ioctl.h
index 15cd6c72a23ba41882618214a0e673380e7d10e1..0c903dcbdb570b368ac6da97139b442abd064518 100644
--- a/arch/powerpc/bits/ioctl.h
+++ b/arch/powerpc/bits/ioctl.h
@@ -1,31 +1,12 @@
-//#define _IOC(a,b,c,d) ( ((a)<<29) | ((b)<<8) | (c) | ((d)<<16) )
-//
-#define _IOC_SIZEBITS   13
-#define _IOC_DIRBITS    3
-
-#define _IOC_NRBITS     8
-#define _IOC_TYPEBITS   8
-
-#define _IOC_NRSHIFT    0
-#define _IOC_TYPESHIFT  (_IOC_NRSHIFT+_IOC_NRBITS)
-#define _IOC_SIZESHIFT  (_IOC_TYPESHIFT+_IOC_TYPEBITS)
-#define _IOC_DIRSHIFT   (_IOC_SIZESHIFT+_IOC_SIZEBITS)
-
-#define _IOC(dir,type,nr,size) \
-        (((dir)  << _IOC_DIRSHIFT) | \
-          ((type) << _IOC_TYPESHIFT) | \
-          ((nr)   << _IOC_NRSHIFT) | \
-          ((size) << _IOC_SIZESHIFT))
-
-
+#define _IOC(a,b,c,d) ( ((a)<<29) | ((b)<<8) | (c) | ((d)<<16) )
 #define _IOC_NONE  1U
 #define _IOC_WRITE 4U
 #define _IOC_READ  2U
 
 #define _IO(a,b) _IOC(_IOC_NONE,(a),(b),0)
 #define _IOW(a,b,c) _IOC(_IOC_WRITE,(a),(b),sizeof(c))
-#define _IOR(a,b,c) _IOC(_IOC_READ ,(a),(b),sizeof(c))
-#define _IOWR(a,b,c) _IOC(_IOC_READ | _IOC_WRITE,(a),(b),sizeof(c))
+#define _IOR(a,b,c) _IOC(_IOC_READ,(a),(b),sizeof(c))
+#define _IOWR(a,b,c) _IOC(_IOC_READ|_IOC_WRITE,(a),(b),sizeof(c))
 
 #define FIONCLEX	_IO('f', 2)
 #define FIOCLEX		_IO('f', 1)
diff --git a/arch/x86_64/bits/ioctl.h b/arch/x86_64/bits/ioctl.h
index 7f3c038093ecf1c215c12cc13d3b01a2dcb78191..77a945517919b9c3216e6eb2f3f5da69ceee5b48 100644
--- a/arch/x86_64/bits/ioctl.h
+++ b/arch/x86_64/bits/ioctl.h
@@ -4,9 +4,9 @@
 #define _IOC_READ  2U
 
 #define _IO(a,b) _IOC(_IOC_NONE,(a),(b),0)
-#define _IOW(a,b,c) _IOC(1,(a),(b),sizeof(c))
-#define _IOR(a,b,c) _IOC(2,(a),(b),sizeof(c))
-#define _IOWR(a,b,c) _IOC(3,(a),(b),sizeof(c))
+#define _IOW(a,b,c) _IOC(_IOC_WRITE,(a),(b),sizeof(c))
+#define _IOR(a,b,c) _IOC(_IOC_READ,(a),(b),sizeof(c))
+#define _IOWR(a,b,c) _IOC(_IOC_READ|_IOC_WRITE,(a),(b),sizeof(c))
 
 #define TCGETS		0x5401
 #define TCSETS		0x5402