linux-kernel - [PATCH][RFC] Make asm-generic/ioctl.h extensible by adding conditionals.

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-ID: <Pine.LNX.4.64.0702240641520.15087@CPE00045a9c397f-CM001225dbafb6>
Date:	Sat, 24 Feb 2007 06:45:20 -0500 (EST)
From:	"Robert P. J. Day" <rpjday@...dspring.com>
To:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: [PATCH][RFC] Make asm-generic/ioctl.h extensible by adding conditionals.


  Add some preprocessor checking to asm-generic/ioctl.h to allow other
ioctl.h headers to simply override what are normally trivial
differences.

Signed-off-by: Robert P. J. Day <rpjday@...dspring.com>

---

  as a followup to my earlier post, is it worth making this change to
allow at least a couple arch-specific ioctl.h files to be massively
simplified?


diff --git a/include/asm-generic/ioctl.h b/include/asm-generic/ioctl.h
index cd02729..e035e6d 100644
--- a/include/asm-generic/ioctl.h
+++ b/include/asm-generic/ioctl.h
@@ -21,8 +21,15 @@
  */
 #define _IOC_NRBITS	8
 #define _IOC_TYPEBITS	8
-#define _IOC_SIZEBITS	14
-#define _IOC_DIRBITS	2
+/*
+ *  Let any architecture override either of the following.
+ */
+#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 +42,17 @@
 #define _IOC_DIRSHIFT	(_IOC_SIZESHIFT+_IOC_SIZEBITS)

 /*
- * Direction bits.
+ * Direction bits, which any architecture can choose to override.
  */
-#define _IOC_NONE	0U
-#define _IOC_WRITE	1U
-#define _IOC_READ	2U
+#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) | \

-- 
========================================================================
Robert P. J. Day
Linux Consulting, Training and Annoying Kernel Pedantry
Waterloo, Ontario, CANADA

http://fsdev.net/wiki/index.php?title=Main_Page
========================================================================
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/