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Message-ID: <20080205051004.GA12223@in.ibm.com>
Date: Tue, 5 Feb 2008 10:40:05 +0530
From: Ananth N Mavinakayanahalli <ananth@...ibm.com>
To: Andrew Morton <akpm@...ux-foundation.org>
Cc: Ingo Molnar <mingo@...e.hu>, lkml <linux-kernel@...r.kernel.org>,
Anil S Keshavamurthy <anil.s.keshavamurthy@...el.com>,
David Miller <davem@...emloft.net>,
Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>,
hskinnemoen@...el.com, Masami Hiramatsu <mhiramat@...hat.com>,
sam@...nborg.org
Subject: [PATCH 1/2] Kprobes: Indicate kretprobe support in Kconfig
From: Ananth N Mavinakayanahalli <ananth@...ibm.com>
This patch adds CONFIG_HAVE_KRETPROBES to the arch/<arch>/Kconfig file
for relevant architectures with kprobes support. This facilitates easy
handling of in-kernel modules (like samples/kprobes/kretprobe_example.c)
that depend on kretprobes being present in the kernel.
Updated to apply on 2.6.24-mm1. Thanks to Sam Ravnborg for helping
make the patch more lean.
Per Mathieu's suggestion, added CONFIG_KRETPROBES and fixed up
dependencies.
Signed-off-by: Ananth N Mavinakayanahalli <ananth@...ibm.com>
Acked-by: Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
---
arch/Kconfig | 7 +++++++
arch/ia64/Kconfig | 1 +
arch/powerpc/Kconfig | 1 +
arch/s390/Kconfig | 1 +
arch/x86/Kconfig | 1 +
include/asm-ia64/kprobes.h | 1 -
include/asm-powerpc/kprobes.h | 1 -
include/asm-x86/kprobes.h | 1 -
include/linux/kprobes.h | 6 +++---
kernel/kprobes.c | 9 +++------
10 files changed, 17 insertions(+), 12 deletions(-)
Index: linux-2.6.24/arch/Kconfig
===================================================================
--- linux-2.6.24.orig/arch/Kconfig
+++ linux-2.6.24/arch/Kconfig
@@ -27,5 +27,12 @@ config KPROBES
for kernel debugging, non-intrusive instrumentation and testing.
If in doubt, say "N".
+config KRETPROBES
+ def_bool y
+ depends on KPROBES && HAVE_KRETPROBES
+
config HAVE_KPROBES
def_bool n
+
+config HAVE_KRETPROBES
+ def_bool n
Index: linux-2.6.24/arch/ia64/Kconfig
===================================================================
--- linux-2.6.24.orig/arch/ia64/Kconfig
+++ linux-2.6.24/arch/ia64/Kconfig
@@ -17,6 +17,7 @@ config IA64
select ARCH_SUPPORTS_MSI
select HAVE_OPROFILE
select HAVE_KPROBES
+ select HAVE_KRETPROBES
default y
help
The Itanium Processor Family is Intel's 64-bit successor to
Index: linux-2.6.24/arch/powerpc/Kconfig
===================================================================
--- linux-2.6.24.orig/arch/powerpc/Kconfig
+++ linux-2.6.24/arch/powerpc/Kconfig
@@ -89,6 +89,7 @@ config PPC
default y
select HAVE_OPROFILE
select HAVE_KPROBES
+ select HAVE_KRETPROBES
config EARLY_PRINTK
bool
Index: linux-2.6.24/arch/x86/Kconfig
===================================================================
--- linux-2.6.24.orig/arch/x86/Kconfig
+++ linux-2.6.24/arch/x86/Kconfig
@@ -20,6 +20,7 @@ config X86
def_bool y
select HAVE_OPROFILE
select HAVE_KPROBES
+ select HAVE_KRETPROBES
config GENERIC_LOCKBREAK
def_bool n
Index: linux-2.6.24/include/asm-ia64/kprobes.h
===================================================================
--- linux-2.6.24.orig/include/asm-ia64/kprobes.h
+++ linux-2.6.24/include/asm-ia64/kprobes.h
@@ -82,7 +82,6 @@ struct kprobe_ctlblk {
struct prev_kprobe prev_kprobe[ARCH_PREV_KPROBE_SZ];
};
-#define ARCH_SUPPORTS_KRETPROBES
#define kretprobe_blacklist_size 0
#define SLOT0_OPCODE_SHIFT (37)
Index: linux-2.6.24/include/asm-powerpc/kprobes.h
===================================================================
--- linux-2.6.24.orig/include/asm-powerpc/kprobes.h
+++ linux-2.6.24/include/asm-powerpc/kprobes.h
@@ -80,7 +80,6 @@ typedef unsigned int kprobe_opcode_t;
#define is_trap(instr) (IS_TW(instr) || IS_TWI(instr))
#endif
-#define ARCH_SUPPORTS_KRETPROBES
#define flush_insn_slot(p) do { } while (0)
#define kretprobe_blacklist_size 0
Index: linux-2.6.24/include/asm-x86/kprobes.h
===================================================================
--- linux-2.6.24.orig/include/asm-x86/kprobes.h
+++ linux-2.6.24/include/asm-x86/kprobes.h
@@ -42,7 +42,6 @@ typedef u8 kprobe_opcode_t;
: (((unsigned long)current_thread_info()) + THREAD_SIZE \
- (unsigned long)(ADDR)))
-#define ARCH_SUPPORTS_KRETPROBES
#define flush_insn_slot(p) do { } while (0)
extern const int kretprobe_blacklist_size;
Index: linux-2.6.24/include/linux/kprobes.h
===================================================================
--- linux-2.6.24.orig/include/linux/kprobes.h
+++ linux-2.6.24/include/linux/kprobes.h
@@ -125,11 +125,11 @@ struct jprobe {
DECLARE_PER_CPU(struct kprobe *, current_kprobe);
DECLARE_PER_CPU(struct kprobe_ctlblk, kprobe_ctlblk);
-#ifdef ARCH_SUPPORTS_KRETPROBES
+#ifdef CONFIG_KRETPROBES
extern void arch_prepare_kretprobe(struct kretprobe_instance *ri,
struct pt_regs *regs);
extern int arch_trampoline_kprobe(struct kprobe *p);
-#else /* ARCH_SUPPORTS_KRETPROBES */
+#else /* CONFIG_KRETPROBES */
static inline void arch_prepare_kretprobe(struct kretprobe *rp,
struct pt_regs *regs)
{
@@ -138,7 +138,7 @@ static inline int arch_trampoline_kprobe
{
return 0;
}
-#endif /* ARCH_SUPPORTS_KRETPROBES */
+#endif /* CONFIG_KRETPROBES */
/*
* Function-return probe -
* Note:
Index: linux-2.6.24/kernel/kprobes.c
===================================================================
--- linux-2.6.24.orig/kernel/kprobes.c
+++ linux-2.6.24/kernel/kprobes.c
@@ -678,8 +678,7 @@ void __kprobes unregister_jprobe(struct
unregister_kprobe(&jp->kp);
}
-#ifdef ARCH_SUPPORTS_KRETPROBES
-
+#ifdef CONFIG_KRETPROBES
/*
* This kprobe pre_handler is registered with every kretprobe. When probe
* hits it will set up the return probe.
@@ -769,8 +768,7 @@ int __kprobes register_kretprobe(struct
return ret;
}
-#else /* ARCH_SUPPORTS_KRETPROBES */
-
+#else /* CONFIG_KRETPROBES */
int __kprobes register_kretprobe(struct kretprobe *rp)
{
return -ENOSYS;
@@ -781,8 +779,7 @@ static int __kprobes pre_handler_kretpro
{
return 0;
}
-
-#endif /* ARCH_SUPPORTS_KRETPROBES */
+#endif /* CONFIG_KRETPROBES */
void __kprobes unregister_kretprobe(struct kretprobe *rp)
{
Index: linux-2.6.24/arch/s390/Kconfig
===================================================================
--- linux-2.6.24.orig/arch/s390/Kconfig
+++ linux-2.6.24/arch/s390/Kconfig
@@ -58,6 +58,7 @@ config S390
def_bool y
select HAVE_OPROFILE
select HAVE_KPROBES
+ select HAVE_KRETPROBES
source "init/Kconfig"
--
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