[PATCH 1/2] Kprobes: Indicate kretprobe support in Kconfig

From: Ananth N Mavinakayanahalli
Date: Thu Jan 03 2008 - 01:24:49 EST

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From: Ananth N Mavinakayanahalli <ananth@xxxxxxxxxx>

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-rc6-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@xxxxxxxxxx>
Acked-by: Mathieu Desnoyers <mathieu.desnoyers@xxxxxxxxxx>
---
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-rc6/arch/Kconfig
===================================================================
--- linux-2.6.24-rc6.orig/arch/Kconfig
+++ linux-2.6.24-rc6/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-rc6/arch/ia64/Kconfig
===================================================================
--- linux-2.6.24-rc6.orig/arch/ia64/Kconfig
+++ linux-2.6.24-rc6/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-rc6/arch/powerpc/Kconfig
===================================================================
--- linux-2.6.24-rc6.orig/arch/powerpc/Kconfig
+++ linux-2.6.24-rc6/arch/powerpc/Kconfig
@@ -81,6 +81,7 @@ config PPC
default y
select HAVE_OPROFILE
select HAVE_KPROBES
+ select HAVE_KRETPROBES

config EARLY_PRINTK
bool
Index: linux-2.6.24-rc6/arch/x86/Kconfig
===================================================================
--- linux-2.6.24-rc6.orig/arch/x86/Kconfig
+++ linux-2.6.24-rc6/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-rc6/include/asm-ia64/kprobes.h
===================================================================
--- linux-2.6.24-rc6.orig/include/asm-ia64/kprobes.h
+++ linux-2.6.24-rc6/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-rc6/include/asm-powerpc/kprobes.h
===================================================================
--- linux-2.6.24-rc6.orig/include/asm-powerpc/kprobes.h
+++ linux-2.6.24-rc6/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-rc6/include/asm-x86/kprobes.h
===================================================================
--- linux-2.6.24-rc6.orig/include/asm-x86/kprobes.h
+++ linux-2.6.24-rc6/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-rc6/include/linux/kprobes.h
===================================================================
--- linux-2.6.24-rc6.orig/include/linux/kprobes.h
+++ linux-2.6.24-rc6/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-rc6/kernel/kprobes.c
===================================================================
--- linux-2.6.24-rc6.orig/kernel/kprobes.c
+++ linux-2.6.24-rc6/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.
@@ -762,8 +761,7 @@ int __kprobes register_kretprobe(struct
return ret;
}

-#else /* ARCH_SUPPORTS_KRETPROBES */
-
+#else /* CONFIG_KRETPROBES */
int __kprobes register_kretprobe(struct kretprobe *rp)
{
return -ENOSYS;
@@ -774,8 +772,7 @@ 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-rc6/arch/s390/Kconfig
===================================================================
--- linux-2.6.24-rc6.orig/arch/s390/Kconfig
+++ linux-2.6.24-rc6/arch/s390/Kconfig
@@ -53,6 +53,7 @@ config S390
def_bool y
select HAVE_OPROFILE
select HAVE_KPROBES
+ select HAVE_KRETPROBES

source "init/Kconfig"

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Next message: Joe Perches: "Re: [PATCH 1/3] Unionfs: use printk KERN_CONT for debuggingmessages"
Previous message: Shaohua Li: "[RFC] PCIE ASPM support"
Next in thread: Ananth N Mavinakayanahalli: "[PATCH 2/2] Kprobes: Move kprobes examples to samples/"
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