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Message-ID: <20071211143913.GA19222@Krystal>
Date: Tue, 11 Dec 2007 09:39:13 -0500
From: Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
To: Ananth N Mavinakayanahalli <ananth@...ibm.com>
Cc: akpm@...ux-foundation.org, lkml <linux-kernel@...r.kernel.org>,
Anil S Keshavamurthy <anil.s.keshavamurthy@...el.com>,
davem@...emloft.net, hskinnemoen@...el.com, sam@...nborg.org
Subject: Re: [PATCH 1/2 V2] Kprobes: Indicate kretprobe support in
arch/<arch>/Kconfig
* Ananth N Mavinakayanahalli (ananth@...ibm.com) wrote:
> 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.
>
> This patch depends on Mathieu Desnoyers' "Instrumentation menu removal"
> patchset (http://marc.info/?l=linux-kernel&m=119496432229633&w=2)
>
> Updated to apply on 2.6.24-rc4-mm1. Thanks to Sam Ravnborg for helping
> make the patch more lean.
>
> V2: Per Mathieu's suggestion, added CONFIG_KRETPROBES and fixed up
> dependencies.
>
> Signed-off-by: Ananth N Mavinakayanahalli <ananth@...ibm.com>
You can add my Acked-by if it helps.
Acked-by: Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
Mathieu
> ---
> 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_32.h | 1 -
> include/asm-x86/kprobes_64.h | 1 -
> include/linux/kprobes.h | 6 +++---
> kernel/kprobes.c | 8 +++-----
> 11 files changed, 17 insertions(+), 12 deletions(-)
>
> Index: linux-2.6.24-rc4/arch/Kconfig
> ===================================================================
> --- linux-2.6.24-rc4.orig/arch/Kconfig
> +++ linux-2.6.24-rc4/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-rc4/arch/ia64/Kconfig
> ===================================================================
> --- linux-2.6.24-rc4.orig/arch/ia64/Kconfig
> +++ linux-2.6.24-rc4/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-rc4/arch/powerpc/Kconfig
> ===================================================================
> --- linux-2.6.24-rc4.orig/arch/powerpc/Kconfig
> +++ linux-2.6.24-rc4/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-rc4/arch/s390/Kconfig
> ===================================================================
> --- linux-2.6.24-rc4.orig/arch/s390/Kconfig
> +++ linux-2.6.24-rc4/arch/s390/Kconfig
> @@ -53,6 +53,7 @@ config S390
> def_bool y
> select HAVE_OPROFILE
> select HAVE_KPROBES
> + select HAVE_KRETPROBES
>
> source "init/Kconfig"
>
> Index: linux-2.6.24-rc4/arch/x86/Kconfig
> ===================================================================
> --- linux-2.6.24-rc4.orig/arch/x86/Kconfig
> +++ linux-2.6.24-rc4/arch/x86/Kconfig
> @@ -20,6 +20,7 @@ config X86
> def_bool y
> select HAVE_OPROFILE
> select HAVE_KPROBES
> + select HAVE_KRETPROBES
>
> config GENERIC_TIME
> def_bool y
> Index: linux-2.6.24-rc4/include/asm-ia64/kprobes.h
> ===================================================================
> --- linux-2.6.24-rc4.orig/include/asm-ia64/kprobes.h
> +++ linux-2.6.24-rc4/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-rc4/include/asm-powerpc/kprobes.h
> ===================================================================
> --- linux-2.6.24-rc4.orig/include/asm-powerpc/kprobes.h
> +++ linux-2.6.24-rc4/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-rc4/include/asm-x86/kprobes_32.h
> ===================================================================
> --- linux-2.6.24-rc4.orig/include/asm-x86/kprobes_32.h
> +++ linux-2.6.24-rc4/include/asm-x86/kprobes_32.h
> @@ -42,7 +42,6 @@ typedef u8 kprobe_opcode_t;
> ? (MAX_STACK_SIZE) \
> : (((unsigned long)current_thread_info()) + THREAD_SIZE - (ADDR)))
>
> -#define ARCH_SUPPORTS_KRETPROBES
> #define flush_insn_slot(p) do { } while (0)
>
> extern const int kretprobe_blacklist_size;
> Index: linux-2.6.24-rc4/include/asm-x86/kprobes_64.h
> ===================================================================
> --- linux-2.6.24-rc4.orig/include/asm-x86/kprobes_64.h
> +++ linux-2.6.24-rc4/include/asm-x86/kprobes_64.h
> @@ -41,7 +41,6 @@ typedef u8 kprobe_opcode_t;
> ? (MAX_STACK_SIZE) \
> : (((unsigned long)current_thread_info()) + THREAD_SIZE - (ADDR)))
>
> -#define ARCH_SUPPORTS_KRETPROBES
> extern const int kretprobe_blacklist_size;
>
> void kretprobe_trampoline(void);
> Index: linux-2.6.24-rc4/include/linux/kprobes.h
> ===================================================================
> --- linux-2.6.24-rc4.orig/include/linux/kprobes.h
> +++ linux-2.6.24-rc4/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-rc4/kernel/kprobes.c
> ===================================================================
> --- linux-2.6.24-rc4.orig/kernel/kprobes.c
> +++ linux-2.6.24-rc4/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.
> @@ -762,7 +761,7 @@ int __kprobes register_kretprobe(struct
> return ret;
> }
>
> -#else /* ARCH_SUPPORTS_KRETPROBES */
> +#else /* CONFIG_KRETPROBES */
>
> int __kprobes register_kretprobe(struct kretprobe *rp)
> {
> @@ -774,8 +773,7 @@ static int __kprobes pre_handler_kretpro
> {
> return 0;
> }
> -
> -#endif /* ARCH_SUPPORTS_KRETPROBES */
> +#endif /* CONFIG_KRETPROBES */
>
> void __kprobes unregister_kretprobe(struct kretprobe *rp)
> {
--
Mathieu Desnoyers
Computer Engineering Ph.D. Student, Ecole Polytechnique de Montreal
OpenPGP key fingerprint: 8CD5 52C3 8E3C 4140 715F BA06 3F25 A8FE 3BAE 9A68
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