[PATCH] kprobes: prevent possible race conditions i386 changes

This patch contains the i386 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, 5 deletions

diff --git a/arch/i386/kernel/entry.S b/arch/i386/kernel/entry.S
index abb909793efc..3aad03839660 100644
--- a/arch/i386/kernel/entry.S
+++ b/arch/i386/kernel/entry.S
@@ -507,7 +507,7 @@ label:						\
         pushl $__KERNEL_CS;                     \
         pushl $sysenter_past_esp
 
-ENTRY(debug)
+KPROBE_ENTRY(debug)
         cmpl $sysenter_entry,(%esp)
         jne debug_stack_correct
         FIX_STACK(12, debug_stack_correct, debug_esp_fix_insn)
@@ -518,7 +518,7 @@ debug_stack_correct:
         movl %esp,%eax                  # pt_regs pointer
         call do_debug
         jmp ret_from_exception
-
+        .previous .text
 /*
  * NMI is doubly nasty. It can happen _while_ we're handling
  * a debug fault, and the debug fault hasn't yet been able to
@@ -591,13 +591,14 @@ nmi_16bit_stack:
         .long 1b,iret_exc
 .previous
 
-ENTRY(int3)
+KPROBE_ENTRY(int3)
         pushl $-1                       # mark this as an int
         SAVE_ALL
         xorl %edx,%edx          # zero error code
         movl %esp,%eax          # pt_regs pointer
         call do_int3
         jmp ret_from_exception
+        .previous .text
 
 ENTRY(overflow)
         pushl $0
@@ -631,17 +632,19 @@ ENTRY(stack_segment)
         pushl $do_stack_segment
         jmp error_code
 
-ENTRY(general_protection)
+KPROBE_ENTRY(general_protection)
         pushl $do_general_protection
         jmp error_code
+        .previous .text
 
 ENTRY(alignment_check)
         pushl $do_alignment_check
         jmp error_code
 
-ENTRY(page_fault)
+KPROBE_ENTRY(page_fault)
         pushl $do_page_fault
         jmp error_code
+        .previous .text
 
 #ifdef CONFIG_X86_MCE
 ENTRY(machine_check)