x86/entry: Remove the unused LOCKDEP_SYSEXIT cruft

No users left since two years due to commit 21d375b ("x86/entry/64:
Remove the SYSCALL64 fast path")

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Alexandre Chartre <alexandre.chartre@oracle.com>
Acked-by: Peter Zijlstra <peterz@infradead.org>
Link: https://lkml.kernel.org/r/20200505134059.061301403@linutronix.de

arch/x86/entry/thunk_64.S

@@ -42,10 +42,6 @@ SYM_FUNC_END(\name)
 	THUNK trace_hardirqs_off_thunk,trace_hardirqs_off_caller,1
 #endif
 
-#ifdef CONFIG_DEBUG_LOCK_ALLOC
-	THUNK lockdep_sys_exit_thunk,lockdep_sys_exit
-#endif
-
 #ifdef CONFIG_PREEMPTION
 	THUNK preempt_schedule_thunk, preempt_schedule
 	THUNK preempt_schedule_notrace_thunk, preempt_schedule_notrace
@@ -54,7 +50,6 @@ SYM_FUNC_END(\name)
 #endif
 
 #if defined(CONFIG_TRACE_IRQFLAGS) \
- || defined(CONFIG_DEBUG_LOCK_ALLOC) \
  || defined(CONFIG_PREEMPTION)
 SYM_CODE_START_LOCAL_NOALIGN(.L_restore)
 	popq %r11

arch/x86/include/asm/irqflags.h

@@ -180,30 +180,6 @@ static inline int arch_irqs_disabled(void)
 #  define TRACE_IRQS_ON
 #  define TRACE_IRQS_OFF
 #endif
-#ifdef CONFIG_DEBUG_LOCK_ALLOC
-#  ifdef CONFIG_X86_64
-#    define LOCKDEP_SYS_EXIT		call lockdep_sys_exit_thunk
-#    define LOCKDEP_SYS_EXIT_IRQ \
-	TRACE_IRQS_ON; \
-	sti; \
-	call lockdep_sys_exit_thunk; \
-	cli; \
-	TRACE_IRQS_OFF;
-#  else
-#    define LOCKDEP_SYS_EXIT \
-	pushl %eax;				\
-	pushl %ecx;				\
-	pushl %edx;				\
-	call lockdep_sys_exit;			\
-	popl %edx;				\
-	popl %ecx;				\
-	popl %eax;
-#    define LOCKDEP_SYS_EXIT_IRQ
-#  endif
-#else
-#  define LOCKDEP_SYS_EXIT
-#  define LOCKDEP_SYS_EXIT_IRQ
-#endif
 #endif /* __ASSEMBLY__ */
 
 #endif