arm64: Fix PTRACE_SYSEMU semantics

[linux-2.6-microblaze.git] / arch / arm64 / kernel / ptrace.c

diff --git a/arch/arm64/kernel/ptrace.c b/arch/arm64/kernel/ptrace.c
index b3d3005..e7b0190 100644 (file)
--- a/arch/arm64/kernel/ptrace.c
+++ b/arch/arm64/kernel/ptrace.c
@@ -1829,10 +1829,11 @@ static void tracehook_report_syscall(struct pt_regs *regs,
 
 int syscall_trace_enter(struct pt_regs *regs)
 {
-       if (test_thread_flag(TIF_SYSCALL_TRACE) ||
-               test_thread_flag(TIF_SYSCALL_EMU)) {
+       unsigned long flags = READ_ONCE(current_thread_info()->flags);
+
+       if (flags & (_TIF_SYSCALL_EMU | _TIF_SYSCALL_TRACE)) {
                tracehook_report_syscall(regs, PTRACE_SYSCALL_ENTER);
-               if (!in_syscall(regs) || test_thread_flag(TIF_SYSCALL_EMU))
+               if (!in_syscall(regs) || (flags & _TIF_SYSCALL_EMU))
                        return -1;
        }