[patch 03/11] Kprobes - do not use kprobes mutex in arch code

From: Mathieu Desnoyers
Date: Mon Aug 20 2007 - 16:33:44 EST


Remove the kprobes mutex from kprobes.h, since it does not belong there. Also
remove all use of this mutex in the architecture specific code, replacing it by
a proper mutex lock/unlock in the architecture agnostic code.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@xxxxxxxxxx>
CC: prasanna@xxxxxxxxxx
CC: ananth@xxxxxxxxxx
CC: anil.s.keshavamurthy@xxxxxxxxx
CC: davem@xxxxxxxxxxxxx
---
arch/i386/kernel/kprobes.c | 2 --
arch/ia64/kernel/kprobes.c | 2 --
arch/powerpc/kernel/kprobes.c | 2 --
arch/s390/kernel/kprobes.c | 2 --
arch/x86_64/kernel/kprobes.c | 2 --
include/linux/kprobes.h | 2 --
kernel/kprobes.c | 2 ++
7 files changed, 2 insertions(+), 12 deletions(-)

Index: linux-2.6-lttng/include/linux/kprobes.h
===================================================================
--- linux-2.6-lttng.orig/include/linux/kprobes.h 2007-08-07 15:28:05.000000000 -0400
+++ linux-2.6-lttng/include/linux/kprobes.h 2007-08-07 15:28:22.000000000 -0400
@@ -35,7 +35,6 @@
#include <linux/percpu.h>
#include <linux/spinlock.h>
#include <linux/rcupdate.h>
-#include <linux/mutex.h>

#ifdef CONFIG_KPROBES
#include <asm/kprobes.h>
@@ -177,7 +176,6 @@ static inline void kretprobe_assert(stru
}

extern spinlock_t kretprobe_lock;
-extern struct mutex kprobe_mutex;
extern int arch_prepare_kprobe(struct kprobe *p);
extern void arch_arm_kprobe(struct kprobe *p);
extern void arch_disarm_kprobe(struct kprobe *p);
Index: linux-2.6-lttng/arch/i386/kernel/kprobes.c
===================================================================
--- linux-2.6-lttng.orig/arch/i386/kernel/kprobes.c 2007-08-07 15:28:05.000000000 -0400
+++ linux-2.6-lttng/arch/i386/kernel/kprobes.c 2007-08-07 15:28:22.000000000 -0400
@@ -180,9 +180,7 @@ void __kprobes arch_disarm_kprobe(struct

void __kprobes arch_remove_kprobe(struct kprobe *p)
{
- mutex_lock(&kprobe_mutex);
free_insn_slot(p->ainsn.insn, (p->ainsn.boostable == 1));
- mutex_unlock(&kprobe_mutex);
}

static void __kprobes save_previous_kprobe(struct kprobe_ctlblk *kcb)
Index: linux-2.6-lttng/kernel/kprobes.c
===================================================================
--- linux-2.6-lttng.orig/kernel/kprobes.c 2007-08-07 15:28:22.000000000 -0400
+++ linux-2.6-lttng/kernel/kprobes.c 2007-08-07 15:28:22.000000000 -0400
@@ -656,7 +656,9 @@ valid_p:
list_del_rcu(&p->list);
kfree(old_p);
}
+ mutex_lock(&kprobe_mutex);
arch_remove_kprobe(p);
+ mutex_unlock(&kprobe_mutex);
} else {
mutex_lock(&kprobe_mutex);
if (p->break_handler)
Index: linux-2.6-lttng/arch/ia64/kernel/kprobes.c
===================================================================
--- linux-2.6-lttng.orig/arch/ia64/kernel/kprobes.c 2007-08-07 15:28:05.000000000 -0400
+++ linux-2.6-lttng/arch/ia64/kernel/kprobes.c 2007-08-07 15:28:22.000000000 -0400
@@ -565,9 +565,7 @@ void __kprobes arch_disarm_kprobe(struct

void __kprobes arch_remove_kprobe(struct kprobe *p)
{
- mutex_lock(&kprobe_mutex);
free_insn_slot(p->ainsn.insn, 0);
- mutex_unlock(&kprobe_mutex);
}
/*
* We are resuming execution after a single step fault, so the pt_regs
Index: linux-2.6-lttng/arch/powerpc/kernel/kprobes.c
===================================================================
--- linux-2.6-lttng.orig/arch/powerpc/kernel/kprobes.c 2007-08-07 15:28:05.000000000 -0400
+++ linux-2.6-lttng/arch/powerpc/kernel/kprobes.c 2007-08-07 15:28:22.000000000 -0400
@@ -86,9 +86,7 @@ void __kprobes arch_disarm_kprobe(struct

void __kprobes arch_remove_kprobe(struct kprobe *p)
{
- mutex_lock(&kprobe_mutex);
free_insn_slot(p->ainsn.insn, 0);
- mutex_unlock(&kprobe_mutex);
}

static void __kprobes prepare_singlestep(struct kprobe *p, struct pt_regs *regs)
Index: linux-2.6-lttng/arch/s390/kernel/kprobes.c
===================================================================
--- linux-2.6-lttng.orig/arch/s390/kernel/kprobes.c 2007-08-07 15:28:05.000000000 -0400
+++ linux-2.6-lttng/arch/s390/kernel/kprobes.c 2007-08-07 15:28:22.000000000 -0400
@@ -218,9 +218,7 @@ void __kprobes arch_disarm_kprobe(struct

void __kprobes arch_remove_kprobe(struct kprobe *p)
{
- mutex_lock(&kprobe_mutex);
free_insn_slot(p->ainsn.insn, 0);
- mutex_unlock(&kprobe_mutex);
}

static void __kprobes prepare_singlestep(struct kprobe *p, struct pt_regs *regs)
Index: linux-2.6-lttng/arch/x86_64/kernel/kprobes.c
===================================================================
--- linux-2.6-lttng.orig/arch/x86_64/kernel/kprobes.c 2007-08-07 15:28:06.000000000 -0400
+++ linux-2.6-lttng/arch/x86_64/kernel/kprobes.c 2007-08-07 15:28:22.000000000 -0400
@@ -219,9 +219,7 @@ void __kprobes arch_disarm_kprobe(struct

void __kprobes arch_remove_kprobe(struct kprobe *p)
{
- mutex_lock(&kprobe_mutex);
free_insn_slot(p->ainsn.insn, 0);
- mutex_unlock(&kprobe_mutex);
}

static void __kprobes save_previous_kprobe(struct kprobe_ctlblk *kcb)

--
Mathieu Desnoyers
Computer Engineering Ph.D. Student, Ecole Polytechnique de Montreal
OpenPGP key fingerprint: 8CD5 52C3 8E3C 4140 715F BA06 3F25 A8FE 3BAE 9A68
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/