Index: linux-2.6.21-rc5/include/asm-powerpc/thread_info.h
===================================================================
--- linux-2.6.21-rc5.orig/include/asm-powerpc/thread_info.h
+++ linux-2.6.21-rc5/include/asm-powerpc/thread_info.h
@@ -35,6 +35,9 @@ struct thread_info {
 	int		cpu;			/* cpu we're on */
 	int		preempt_count;		/* 0 => preemptable,
 						   <0 => BUG */
+#ifdef CONFIG_THREAD_PERF_STAT_SYSC
+	unsigned long	sysc_cnt;		/* Syscall counter */
+#endif /* CONFIG_THREAD_PERF_STAT_SYSC */
 	struct restart_block restart_block;
 	unsigned long	local_flags;		/* private flags for thread */
 
Index: linux-2.6.21-rc5/arch/powerpc/kernel/asm-offsets.c
===================================================================
--- linux-2.6.21-rc5.orig/arch/powerpc/kernel/asm-offsets.c
+++ linux-2.6.21-rc5/arch/powerpc/kernel/asm-offsets.c
@@ -94,6 +94,10 @@ int main(void)
 	DEFINE(TI_LOCAL_FLAGS, offsetof(struct thread_info, local_flags));
 	DEFINE(TI_PREEMPT, offsetof(struct thread_info, preempt_count));
 	DEFINE(TI_TASK, offsetof(struct thread_info, task));
+#ifdef CONFIG_THREAD_PERF_STAT_SYSC
+        DEFINE(TI_SYSC_CNT, offsetof(struct thread_info, sysc_cnt)); 
+#endif /* CONFIG_THREAD_PERF_STAT_SYSC */
+		
 #ifdef CONFIG_PPC32
 	DEFINE(TI_EXECDOMAIN, offsetof(struct thread_info, exec_domain));
 	DEFINE(TI_CPU, offsetof(struct thread_info, cpu));
Index: linux-2.6.21-rc5/arch/powerpc/kernel/entry_32.S
===================================================================
--- linux-2.6.21-rc5.orig/arch/powerpc/kernel/entry_32.S
+++ linux-2.6.21-rc5/arch/powerpc/kernel/entry_32.S
@@ -223,6 +223,11 @@ ret_from_syscall:
 #endif
 	mr	r6,r3
 	rlwinm	r12,r1,0,0,(31-THREAD_SHIFT)	/* current_thread_info() */
+#ifdef CONFIG_THREAD_PERF_STAT_SYSC
+	lwz r9,TI_SYSC_CNT(r12)
+	addi r9,r9,1
+	stw r9,TI_SYSC_CNT(r12)
+#endif /* CONFIG_THREAD_PERF_STAT_SYSC */
 	/* disable interrupts so current_thread_info()->flags can't change */
 	LOAD_MSR_KERNEL(r10,MSR_KERNEL)	/* doesn't include MSR_EE */
 	SYNC
Index: linux-2.6.21-rc5/lib/Kconfig.debug
===================================================================
--- linux-2.6.21-rc5.orig/lib/Kconfig.debug
+++ linux-2.6.21-rc5/lib/Kconfig.debug
@@ -458,6 +458,6 @@ config THREAD_PERF_STAT
 
 config THREAD_PERF_STAT_SYSC
        bool "Enable syscall counter"
-       depends on THREAD_PERF_STAT && X86
+       depends on THREAD_PERF_STAT && (X86 || PPC32)
        help
          This option adds a syscall counter to /proc/PID/status.