[PATCH] Fix atomicity of TIF update in flush_thread() for x86_64

[linux-2.6-omap-h63xx.git] / arch / x86_64 / kernel / process.c

diff --git a/arch/x86_64/kernel/process.c b/arch/x86_64/kernel/process.c
index cbbc6adc1a92004c902954f10777528f6b964178..d8d5ccc245c8977eaa1c616b9301df058661d386 100644 (file)
--- a/arch/x86_64/kernel/process.c
+++ b/arch/x86_64/kernel/process.c
@@ -382,14 +382,17 @@ void exit_thread(void)
 void flush_thread(void)
 {
        struct task_struct *tsk = current;
-       struct thread_info *t = current_thread_info();
 
-       if (t->flags & _TIF_ABI_PENDING) {
-               t->flags ^= (_TIF_ABI_PENDING | _TIF_IA32);
-               if (t->flags & _TIF_IA32)
+       if (test_tsk_thread_flag(tsk, TIF_ABI_PENDING)) {
+               clear_tsk_thread_flag(tsk, TIF_ABI_PENDING);
+               if (test_tsk_thread_flag(tsk, TIF_IA32)) {
+                       clear_tsk_thread_flag(tsk, TIF_IA32);
+               } else {
+                       set_tsk_thread_flag(tsk, TIF_IA32);
                        current_thread_info()->status |= TS_COMPAT;
+               }
        }
-       t->flags &= ~_TIF_DEBUG;
+       clear_tsk_thread_flag(tsk, TIF_DEBUG);
 
        tsk->thread.debugreg0 = 0;
        tsk->thread.debugreg1 = 0;