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[PATCH] kprobes: enable funcions only for required arch

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Kernel/kprobes.c defines get_insn_slot() and free_insn_slot() which are
currently required _only_ for x86_64 and powerpc (which has no-exec support).

FYI, get{free}_insn_slot() functions manages the memory page which is mapped
as executable, required for instruction emulation.

This patch moves those two functions under __ARCH_WANT_KPROBES_INSN_SLOT and
defines __ARCH_WANT_KPROBES_INSN_SLOT in arch specific kprobes.h file.

Signed-off-by: Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Anil S Keshavamurthy 2006-01-09 20:52:41 -08:00 • committed by Linus Torvalds
parent d1c0b8f835
commit 2d14e39da8
3 changed files with 6 additions and 0 deletions
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2
include/asm-powerpc/kprobes.h
View file

@ -30,6 +30,8 @@
#include <linux/ptrace.h> #include <linux/ptrace.h>
#include <linux/percpu.h> #include <linux/percpu.h>
#define __ARCH_WANT_KPROBES_INSN_SLOT
struct pt_regs; struct pt_regs;
typedef unsigned int kprobe_opcode_t; typedef unsigned int kprobe_opcode_t;

2
include/asm-x86_64/kprobes.h
View file

@ -27,6 +27,8 @@
#include <linux/ptrace.h> #include <linux/ptrace.h>
#include <linux/percpu.h> #include <linux/percpu.h>
#define __ARCH_WANT_KPROBES_INSN_SLOT
struct pt_regs; struct pt_regs;
typedef u8 kprobe_opcode_t; typedef u8 kprobe_opcode_t;

2
kernel/kprobes.c
View file

@ -52,6 +52,7 @@ static DEFINE_SPINLOCK(kprobe_lock); /* Protects kprobe_table */
DEFINE_SPINLOCK(kretprobe_lock); /* Protects kretprobe_inst_table */ DEFINE_SPINLOCK(kretprobe_lock); /* Protects kretprobe_inst_table */
static DEFINE_PER_CPU(struct kprobe *, kprobe_instance) = NULL; static DEFINE_PER_CPU(struct kprobe *, kprobe_instance) = NULL;
#ifdef __ARCH_WANT_KPROBES_INSN_SLOT
/* /*
* kprobe->ainsn.insn points to the copy of the instruction to be * kprobe->ainsn.insn points to the copy of the instruction to be
* single-stepped. x86_64, POWER4 and above have no-exec support and * single-stepped. x86_64, POWER4 and above have no-exec support and
@ -151,6 +152,7 @@ void __kprobes free_insn_slot(kprobe_opcode_t *slot)
} }
} }
} }
#endif
/* We have preemption disabled.. so it is safe to use __ versions */ /* We have preemption disabled.. so it is safe to use __ versions */
static inline void set_kprobe_instance(struct kprobe *kp) static inline void set_kprobe_instance(struct kprobe *kp)