[PATCH v4 09/12] powerpc/tracing: fix compat syscall handling

[Marcin Nowakowski]

Adapt the code to make use of new syscall handling interface

Signed-off-by: Marcin Nowakowski <marcin.nowakowski@xxxxxxxxxx>
Cc: Steven Rostedt <rostedt@xxxxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxxxxx>
Cc: Benjamin Herrenschmidt <benh@xxxxxxxxxxxxxxxxxxx>
Cc: Paul Mackerras <paulus@xxxxxxxxx>
Cc: Michael Ellerman <mpe@xxxxxxxxxxxxxx>
Cc: linuxppc-dev@xxxxxxxxxxxxxxxx
---
 arch/powerpc/include/asm/ftrace.h | 13 +++++++++++++
 arch/powerpc/kernel/ftrace.c      |  4 ++++
 2 files changed, 17 insertions(+)

diff --git a/arch/powerpc/include/asm/ftrace.h b/arch/powerpc/include/asm/ftrace.h
index f266051..c6c660d 100644
--- a/arch/powerpc/include/asm/ftrace.h
+++ b/arch/powerpc/include/asm/ftrace.h
@@ -72,4 +72,17 @@ struct dyn_arch_ftrace {
 #define ARCH_SYM_NAME_SKIP_CHARS 1
 #endif
 
+#if defined(CONFIG_FTRACE_SYSCALLS) && !defined(__ASSEMBLY__)
+#if defined(CONFIG_COMPAT)
+#include <linux/compat.h>
+#include <asm/compat.h>
+
+#define ARCH_COMPAT_SYSCALL_NUMBERS_OVERLAP 1
+static inline bool arch_trace_is_compat_syscall(struct pt_regs *regs)
+{
+	return in_compat_syscall();
+}
+#endif /* CONFIG_COMPAT */
+#endif /* CONFIG_FTRACE_SYSCALLS && !__ASSEMBLY__ */
+
 #endif /* _ASM_POWERPC_FTRACE */
diff --git a/arch/powerpc/kernel/ftrace.c b/arch/powerpc/kernel/ftrace.c
index 5bfb35f..12c00f7 100644
--- a/arch/powerpc/kernel/ftrace.c
+++ b/arch/powerpc/kernel/ftrace.c
@@ -606,6 +606,10 @@ unsigned long prepare_ftrace_return(unsigned long parent, unsigned long ip)
 #if defined(CONFIG_FTRACE_SYSCALLS) && defined(CONFIG_PPC64)
 unsigned long __init arch_syscall_addr(int nr, bool compat)
 {
+#ifdef CONFIG_COMPAT
+	if (compat)
+		return sys_call_table[nr*2+1];
+#endif
 	return sys_call_table[nr*2];
 }
 #endif /* CONFIG_FTRACE_SYSCALLS && CONFIG_PPC64 */
-- 
2.7.4