linux-kernel - [PATCH v6 3.2-rc1 14/28] uprobe: register exception notifier

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Date:	Fri, 11 Nov 2011 00:10:16 +0530
From:	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>
To:	Peter Zijlstra <peterz@...radead.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Oleg Nesterov <oleg@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Linux-mm <linux-mm@...ck.org>, Ingo Molnar <mingo@...e.hu>,
	Andi Kleen <andi@...stfloor.org>,
	Christoph Hellwig <hch@...radead.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Roland McGrath <roland@...k.frob.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	Arnaldo Carvalho de Melo <acme@...radead.org>,
	Anton Arapov <anton@...hat.com>,
	Ananth N Mavinakayanahalli <ananth@...ibm.com>,
	Jim Keniston <jkenisto@...ux.vnet.ibm.com>,
	Stephen Wilson <wilsons@...rt.ca>
Subject: [PATCH v6 3.2-rc1 14/28]   uprobe: register exception notifier


Use the notifier mechanism to register uprobes exception notifier.

Signed-off-by: Ananth N Mavinakayanahalli <ananth@...ibm.com>
Signed-off-by: Srikar Dronamraju <srikar@...ux.vnet.ibm.com>
---
 kernel/uprobes.c |    8 +++++++-
 1 files changed, 7 insertions(+), 1 deletions(-)

diff --git a/kernel/uprobes.c b/kernel/uprobes.c
index 2461b20..c4ccb89 100644
--- a/kernel/uprobes.c
+++ b/kernel/uprobes.c
@@ -30,6 +30,7 @@
 #include <linux/mmu_notifier.h>	/* set_pte_at_notify */
 #include <linux/swap.h>		/* try_to_free_swap */
 #include <linux/ptrace.h>	/* user_enable_single_step */
+#include <linux/kdebug.h>	/* notifier mechanism */
 #include <linux/uprobes.h>
 
 static bulkref_t uprobes_srcu;
@@ -1235,6 +1236,11 @@ int uprobe_post_notifier(struct pt_regs *regs)
 	return 1;
 }
 
+struct notifier_block uprobe_exception_nb = {
+	.notifier_call = uprobe_exception_notify,
+	.priority = INT_MAX - 1,	/* notified after kprobes, kgdb */
+};
+
 static int __init init_uprobes(void)
 {
 	int i;
@@ -1244,7 +1250,7 @@ static int __init init_uprobes(void)
 		mutex_init(&uprobes_mmap_mutex[i]);
 	}
 	init_bulkref(&uprobes_srcu);
-	return 0;
+	return register_die_notifier(&uprobe_exception_nb);
 }
 
 static void __exit exit_uprobes(void)

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