[patch 1/2] x86, ptrace: add version and last remaining size to status command

[Markus Metzger <markus.t.metzger@intel.com>]

Return the API version and the size of a bts_struct in the PTRACE_BTS_STATUS command. This might be handy in case other archs want to use and extend the interface. It allows users to program against one version and continue to work for newer versions (they have to discard everything they don't understand, of course).

Signed-off-by: Markus Metzger <markus.t.metzger@intel.com>
---

Index: linux-2.6-x86/arch/x86/kernel/ptrace.c
===================================================================
--- linux-2.6-x86.orig/arch/x86/kernel/ptrace.c	2008-01-07 12:42:39.%N +0100
+++ linux-2.6-x86/arch/x86/kernel/ptrace.c	2008-01-07 13:09:07.%N +0100
@@ -787,6 +787,9 @@
 			cfg.flags |= PTRACE_BTS_O_SCHED;
 	}
 
+	cfg.bts_size = sizeof(struct bts_struct);
+	cfg.version  = PTRACE_BTS_VERSION;
+
 	if (copy_to_user(ucfg, &cfg, sizeof(cfg)))
 		return -EFAULT;
 
Index: linux-2.6-x86/include/asm-x86/ptrace-abi.h
===================================================================
--- linux-2.6-x86.orig/include/asm-x86/ptrace-abi.h	2008-01-07 12:42:39.%N +0100
+++ linux-2.6-x86/include/asm-x86/ptrace-abi.h	2008-01-07 13:08:39.%N +0100
@@ -91,6 +91,10 @@
 	unsigned int flags;
 	/* buffer overflow signal */
 	unsigned int signal;
+	/* actual size of bts_struct in bytes */
+	unsigned short bts_size;
+	/* interface version */
+	unsigned short version;
 };
 #endif
 
Index: linux-2.6-x86/include/asm-x86/ptrace.h
===================================================================
--- linux-2.6-x86.orig/include/asm-x86/ptrace.h	2008-01-07 12:42:39.%N +0100
+++ linux-2.6-x86/include/asm-x86/ptrace.h	2008-01-07 13:08:39.%N +0100
@@ -9,6 +9,8 @@
 
 #ifdef __KERNEL__
 
+#define PTRACE_BTS_VERSION 1
+
 /* the DS BTS struct is used for ptrace as well */
 #include <asm/ds.h>
 
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