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Subject[PATCH 03/12] lockdep: x86_64: connect the sysexit hook
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/x86_64/kernel/entry.S | 3 +++
arch/x86_64/lib/thunk.S | 4 ++++
include/asm-x86_64/irqflags.h | 9 +++++++++
3 files changed, 16 insertions(+)
Index: linux-2.6/arch/x86_64/kernel/entry.S
===================================================================
--- linux-2.6.orig/arch/x86_64/kernel/entry.S
+++ linux-2.6/arch/x86_64/kernel/entry.S
@@ -164,6 +164,7 @@ ENTRY(ret_from_fork)
testl $(_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT),threadinfo_flags(%rcx)
jnz rff_trace
rff_action:
+ LOCKDEP_SYS_EXIT
RESTORE_REST
testl $3,CS-ARGOFFSET(%rsp) # from kernel_thread?
je int_ret_from_sys_call
@@ -326,6 +327,7 @@ tracesys:
*/
.globl int_ret_from_sys_call
int_ret_from_sys_call:
+ LOCKDEP_SYS_EXIT_REST
cli
TRACE_IRQS_OFF
testl $3,CS-ARGOFFSET(%rsp)
@@ -382,6 +384,7 @@ int_signal:
call do_notify_resume
1: movl $_TIF_NEED_RESCHED,%edi
int_restore_rest:
+ LOCKDEP_SYS_EXIT
RESTORE_REST
cli
TRACE_IRQS_OFF
Index: linux-2.6/arch/x86_64/lib/thunk.S
===================================================================
--- linux-2.6.orig/arch/x86_64/lib/thunk.S
+++ linux-2.6/arch/x86_64/lib/thunk.S
@@ -50,6 +50,10 @@
thunk trace_hardirqs_on_thunk,trace_hardirqs_on
thunk trace_hardirqs_off_thunk,trace_hardirqs_off
#endif
+
+#ifdef CONFIG_DEBUG_LOCK_ALLOC
+ thunk lockdep_sys_exit_thunk,lockdep_sys_exit
+#endif

/* SAVE_ARGS below is used only for the .cfi directives it contains. */
CFI_STARTPROC
Index: linux-2.6/include/asm-x86_64/irqflags.h
===================================================================
--- linux-2.6.orig/include/asm-x86_64/irqflags.h
+++ linux-2.6/include/asm-x86_64/irqflags.h
@@ -137,6 +137,15 @@ static inline void halt(void)
# define TRACE_IRQS_ON
# define TRACE_IRQS_OFF
# endif
+# ifdef CONFIG_DEBUG_LOCK_ALLOC
+# define LOCKDEP_SYS_EXIT call lockdep_sys_exit_thunk
+# define LOCKDEP_SYS_EXIT_REST SAVE_REST; \
+ LOCKDEP_SYS_EXIT; \
+ RESTORE_REST;
+# else
+# define LOCKDEP_SYS_EXIT
+# define LOCKDEP_SYS_EXIT_REST
+# endif
#endif

#endif
--

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