[PATCH] kprobes: prevent possible race conditions x86_64 changes

This patch contains the x86_64 architecture specific changes to prevent the
possible race conditions.

Signed-off-by: Prasanna S Panchamukhi <prasanna@in.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 8 insertions, 4 deletions

diff --git a/arch/x86_64/kernel/entry.S b/arch/x86_64/kernel/entry.S
index 096d470e280f..be51dbe1f75e 100644
--- a/arch/x86_64/kernel/entry.S
+++ b/arch/x86_64/kernel/entry.S
@@ -784,8 +784,9 @@ ENTRY(execve)
         ret
         CFI_ENDPROC
 
-ENTRY(page_fault)
+KPROBE_ENTRY(page_fault)
         errorentry do_page_fault
+        .previous .text
 
 ENTRY(coprocessor_error)
         zeroentry do_coprocessor_error
@@ -797,13 +798,14 @@ ENTRY(device_not_available)
         zeroentry math_state_restore
 
         /* runs on exception stack */
-ENTRY(debug)
+KPROBE_ENTRY(debug)
         CFI_STARTPROC
         pushq $0
         CFI_ADJUST_CFA_OFFSET 8         
         paranoidentry do_debug
         jmp paranoid_exit
         CFI_ENDPROC
+        .previous .text
 
         /* runs on exception stack */   
 ENTRY(nmi)
@@ -854,8 +856,9 @@ paranoid_schedule:
         jmp paranoid_userspace
         CFI_ENDPROC
 
-ENTRY(int3)
+KPROBE_ENTRY(int3)
         zeroentry do_int3       
+        .previous .text
 
 ENTRY(overflow)
         zeroentry do_overflow
@@ -892,8 +895,9 @@ ENTRY(stack_segment)
         jmp paranoid_exit
         CFI_ENDPROC
 
-ENTRY(general_protection)
+KPROBE_ENTRY(general_protection)
         errorentry do_general_protection
+        .previous .text
 
 ENTRY(alignment_check)
         errorentry do_alignment_check