[PATCH] kprobes: enable funcions only for required arch

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>

2 files changed, 4 insertions, 0 deletions

diff --git a/include/asm-powerpc/kprobes.h b/include/asm-powerpc/kprobes.h
index 0654f79b06df..7c98e547c6d8 100644
--- a/include/asm-powerpc/kprobes.h
+++ b/include/asm-powerpc/kprobes.h
@@ -30,6 +30,8 @@
 #include <linux/ptrace.h>
 #include <linux/percpu.h>
 
+#define  __ARCH_WANT_KPROBES_INSN_SLOT
+
 struct pt_regs;
 
 typedef unsigned int kprobe_opcode_t;
diff --git a/include/asm-x86_64/kprobes.h b/include/asm-x86_64/kprobes.h
index 4dd7a7e148d4..9e2532adf42c 100644
--- a/include/asm-x86_64/kprobes.h
+++ b/include/asm-x86_64/kprobes.h
@@ -27,6 +27,8 @@
 #include <linux/ptrace.h>
 #include <linux/percpu.h>
 
+#define  __ARCH_WANT_KPROBES_INSN_SLOT
+
 struct pt_regs;
 
 typedef u8 kprobe_opcode_t;