Merge branch 'perf/urgent' into perf/core

[linux-2.6-block.git] / arch / x86 / kernel / process.c

diff --git a/arch/x86/kernel/process.c b/arch/x86/kernel/process.c
index 28ad9f4d8b94aa9743386f3f76f8f2e9634f6b10..eccdb57094e39e5ccd4dfb3b657c7fba273ba348 100644 (file)
--- a/arch/x86/kernel/process.c
+++ b/arch/x86/kernel/process.c
@@ -20,7 +20,6 @@
 #include <asm/idle.h>
 #include <asm/uaccess.h>
 #include <asm/i387.h>
-#include <asm/ds.h>
 #include <asm/debugreg.h>
 
 unsigned long idle_halt;
@@ -50,8 +49,6 @@ void free_thread_xstate(struct task_struct *tsk)
                kmem_cache_free(task_xstate_cachep, tsk->thread.xstate);
                tsk->thread.xstate = NULL;
        }
-
-       WARN(tsk->thread.ds_ctx, "leaking DS context\n");
 }
 
 void free_thread_info(struct thread_info *ti)
@@ -198,11 +195,16 @@ void __switch_to_xtra(struct task_struct *prev_p, struct task_struct *next_p,
        prev = &prev_p->thread;
        next = &next_p->thread;
 
-       if (test_tsk_thread_flag(next_p, TIF_DS_AREA_MSR) ||
-           test_tsk_thread_flag(prev_p, TIF_DS_AREA_MSR))
-               ds_switch_to(prev_p, next_p);
-       else if (next->debugctlmsr != prev->debugctlmsr)
-               update_debugctlmsr(next->debugctlmsr);
+       if (test_tsk_thread_flag(prev_p, TIF_BLOCKSTEP) ^
+           test_tsk_thread_flag(next_p, TIF_BLOCKSTEP)) {
+               unsigned long debugctl = get_debugctlmsr();
+
+               debugctl &= ~DEBUGCTLMSR_BTF;
+               if (test_tsk_thread_flag(next_p, TIF_BLOCKSTEP))
+                       debugctl |= DEBUGCTLMSR_BTF;
+
+               update_debugctlmsr(debugctl);
+       }
 
        if (test_tsk_thread_flag(prev_p, TIF_NOTSC) ^
            test_tsk_thread_flag(next_p, TIF_NOTSC)) {