[PATCH 02/12] lockdep: i386: connect the sysexit hook

[Peter Zijlstra <a.p.zijlstra@chello.nl>]

Run the lockdep_sys_exit hook after all other C code on the syscall
return path.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
---
 arch/i386/kernel/entry.S    |    3 +++
 include/asm-i386/irqflags.h |   13 +++++++++++++
 2 files changed, 16 insertions(+)

Index: linux-2.6/arch/i386/kernel/entry.S
===================================================================
--- linux-2.6.orig/arch/i386/kernel/entry.S
+++ linux-2.6/arch/i386/kernel/entry.S
@@ -338,6 +338,7 @@ sysenter_past_esp:
 	jae syscall_badsys
 	call *sys_call_table(,%eax,4)
 	movl %eax,PT_EAX(%esp)
+	LOCKDEP_SYS_EXIT
 	DISABLE_INTERRUPTS(CLBR_ANY)
 	TRACE_IRQS_OFF
 	movl TI_flags(%ebp), %ecx
@@ -376,6 +377,7 @@ ENTRY(system_call)
 syscall_call:
 	call *sys_call_table(,%eax,4)
 	movl %eax,PT_EAX(%esp)		# store the return value
+	LOCKDEP_SYS_EXIT
 syscall_exit:
 	DISABLE_INTERRUPTS(CLBR_ANY)	# make sure we don't miss an interrupt
 					# setting need_resched or sigpending
@@ -532,6 +534,7 @@ syscall_exit_work:
 	movl %esp, %eax
 	movl $1, %edx
 	call do_syscall_trace
+	LOCKDEP_SYS_EXIT
 	jmp resume_userspace
 END(syscall_exit_work)
 	CFI_ENDPROC
Index: linux-2.6/include/asm-i386/irqflags.h
===================================================================
--- linux-2.6.orig/include/asm-i386/irqflags.h
+++ linux-2.6/include/asm-i386/irqflags.h
@@ -160,4 +160,17 @@ static inline int raw_irqs_disabled(void
 # define TRACE_IRQS_OFF
 #endif
 
+#ifdef CONFIG_DEBUG_LOCK_ALLOC
+# define LOCKDEP_SYS_EXIT			\
+	pushl %eax;				\
+	pushl %ecx;				\
+	pushl %edx;				\
+	call lockdep_sys_exit;			\
+	popl %edx;				\
+	popl %ecx;				\
+	popl %eax;
+#else
+# define LOCKDEP_SYS_EXIT
+#endif
+
 #endif

--

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