From 9edddaa200df18e08fe0cf21036e8ae467b1363c Mon Sep 17 00:00:00 2001
From: Ananth N Mavinakayanahalli <ananth@in.ibm.com>
Date: Tue, 4 Mar 2008 14:28:37 -0800
Subject: [PATCH] Kprobes: indicate kretprobe support in Kconfig
Add 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.
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@in.ibm.com>
Acked-by: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
Acked-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---
arch/Kconfig | 7 +++++++
arch/arm/Kconfig | 1 +
arch/ia64/Kconfig | 1 +
arch/powerpc/Kconfig | 1 +
arch/s390/Kconfig | 1 +
arch/sparc64/Kconfig | 1 +
arch/x86/Kconfig | 1 +
include/asm-arm/kprobes.h | 1 -
include/asm-ia64/kprobes.h | 1 -
include/asm-powerpc/kprobes.h | 1 -
include/asm-s390/kprobes.h | 1 -
include/asm-sparc64/kprobes.h | 2 --
include/asm-x86/kprobes.h | 1 -
include/linux/kprobes.h | 6 +++---
kernel/kprobes.c | 9 +++------
15 files changed, 19 insertions(+), 16 deletions(-)
diff --git a/arch/Kconfig b/arch/Kconfig
index 3d72dc3fc8f5..694c9af520bb 100644
--- a/arch/Kconfig
+++ b/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
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 16b82e1272b0..955fc53c1c01 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -12,6 +12,7 @@ config ARM
select SYS_SUPPORTS_APM_EMULATION
select HAVE_OPROFILE
select HAVE_KPROBES if (!XIP_KERNEL)
+ select HAVE_KRETPROBES if (HAVE_KPROBES)
help
The ARM series is a line of low-power-consumption RISC chip designs
licensed by ARM Ltd and targeted at embedded applications and
diff --git a/arch/ia64/Kconfig b/arch/ia64/Kconfig
index dff9edfc7465..56762d3c2a6a 100644
--- a/arch/ia64/Kconfig
+++ b/arch/ia64/Kconfig
@@ -18,6 +18,7 @@ config IA64
select HAVE_IDE
select HAVE_OPROFILE
select HAVE_KPROBES
+ select HAVE_KRETPROBES
default y
help
The Itanium Processor Family is Intel's 64-bit successor to
diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index 5b8d8382b762..1189d8d6170d 100644
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -90,6 +90,7 @@ config PPC
select HAVE_IDE
select HAVE_OPROFILE
select HAVE_KPROBES
+ select HAVE_KRETPROBES
config EARLY_PRINTK
bool
diff --git a/arch/s390/Kconfig b/arch/s390/Kconfig
index b21444b681b6..9892827b6176 100644
--- a/arch/s390/Kconfig
+++ b/arch/s390/Kconfig
@@ -61,6 +61,7 @@ config S390
def_bool y
select HAVE_OPROFILE
select HAVE_KPROBES
+ select HAVE_KRETPROBES
source "init/Kconfig"
diff --git a/arch/sparc64/Kconfig b/arch/sparc64/Kconfig
index 3af378ddb6ae..463d1be32c98 100644
--- a/arch/sparc64/Kconfig
+++ b/arch/sparc64/Kconfig
@@ -10,6 +10,7 @@ config SPARC
default y
select HAVE_OPROFILE
select HAVE_KPROBES
+ select HAVE_KRETPROBES
config SPARC64
bool
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 53800b80a204..f41c9538ca30 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -21,6 +21,7 @@ config X86
select HAVE_IDE
select HAVE_OPROFILE
select HAVE_KPROBES
+ select HAVE_KRETPROBES
select HAVE_KVM if ((X86_32 && !X86_VOYAGER && !X86_VISWS && !X86_NUMAQ) || X86_64)
diff --git a/include/asm-arm/kprobes.h b/include/asm-arm/kprobes.h
index 4e7bd32288ae..c042194d3ab5 100644
--- a/include/asm-arm/kprobes.h
+++ b/include/asm-arm/kprobes.h
@@ -20,7 +20,6 @@
#include <linux/ptrace.h>
#include <linux/percpu.h>
-#define ARCH_SUPPORTS_KRETPROBES
#define __ARCH_WANT_KPROBES_INSN_SLOT
#define MAX_INSN_SIZE 2
#define MAX_STACK_SIZE 64 /* 32 would probably be OK */
diff --git a/include/asm-ia64/kprobes.h b/include/asm-ia64/kprobes.h
index a93ce9ef07ff..adbaba14eb0a 100644
--- a/include/asm-ia64/kprobes.h
+++ b/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)
diff --git a/include/asm-powerpc/kprobes.h b/include/asm-powerpc/kprobes.h
index afabad230dbb..d0e7701fa1f6 100644
--- a/include/asm-powerpc/kprobes.h
+++ b/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
diff --git a/include/asm-s390/kprobes.h b/include/asm-s390/kprobes.h
index 948db3d0d05c..330f68caffe4 100644
--- a/include/asm-s390/kprobes.h
+++ b/include/asm-s390/kprobes.h
@@ -46,7 +46,6 @@ typedef u16 kprobe_opcode_t;
? (MAX_STACK_SIZE) \
: (((unsigned long)current_thread_info()) + THREAD_SIZE - (ADDR)))
-#define ARCH_SUPPORTS_KRETPROBES
#define kretprobe_blacklist_size 0
#define KPROBE_SWAP_INST 0x10
diff --git a/include/asm-sparc64/kprobes.h b/include/asm-sparc64/kprobes.h
index 7237dd87663e..5879d71afdaa 100644
--- a/include/asm-sparc64/kprobes.h
+++ b/include/asm-sparc64/kprobes.h
@@ -14,8 +14,6 @@ typedef u32 kprobe_opcode_t;
#define arch_remove_kprobe(p) do {} while (0)
-#define ARCH_SUPPORTS_KRETPROBES
-
#define flush_insn_slot(p) \
do { flushi(&(p)->ainsn.insn[0]); \
flushi(&(p)->ainsn.insn[1]); \
diff --git a/include/asm-x86/kprobes.h b/include/asm-x86/kprobes.h
index 143476a3cb52..61ad7b5d142e 100644
--- a/include/asm-x86/kprobes.h
+++ b/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;
diff --git a/include/linux/kprobes.h b/include/linux/kprobes.h
index 4a6ce82ba039..0f28486f6360 100644
--- a/include/linux/kprobes.h
+++ b/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(struct kprobe *p)
{
return 0;
}
-#endif /* ARCH_SUPPORTS_KRETPROBES */
+#endif /* CONFIG_KRETPROBES */
/*
* Function-return probe -
* Note:
diff --git a/kernel/kprobes.c b/kernel/kprobes.c
index 7a86e6432338..e6a61dcbc578 100644
--- a/kernel/kprobes.c
+++ b/kernel/kprobes.c
@@ -678,8 +678,7 @@ void __kprobes unregister_jprobe(struct jprobe *jp)
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 kretprobe *rp)
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_kretprobe(struct kprobe *p,
{
return 0;
}
-
-#endif /* ARCH_SUPPORTS_KRETPROBES */
+#endif /* CONFIG_KRETPROBES */
void __kprobes unregister_kretprobe(struct kretprobe *rp)
{