Merge branch 'linus' into x86/pebs

[pandora-kernel.git] / arch / x86 / kernel / process_64.c

diff --git a/arch/x86/kernel/process_64.c b/arch/x86/kernel/process_64.c
index 3fb62a7..91ffce4 100644 (file)
--- a/arch/x86/kernel/process_64.c
+++ b/arch/x86/kernel/process_64.c
@@ -239,6 +239,14 @@ void exit_thread(void)
                t->io_bitmap_max = 0;
                put_cpu();
        }
+#ifdef CONFIG_X86_DS
+       /* Free any DS contexts that have not been properly released. */
+       if (unlikely(t->ds_ctx)) {
+               /* we clear debugctl to make sure DS is not used. */
+               update_debugctlmsr(0);
+               ds_free(t->ds_ctx);
+       }
+#endif /* CONFIG_X86_DS */
 }
 
 void flush_thread(void)
@@ -472,13 +480,27 @@ static inline void __switch_to_xtra(struct task_struct *prev_p,
        next = &next_p->thread;
 
        debugctl = prev->debugctlmsr;
-       if (next->ds_area_msr != prev->ds_area_msr) {
-               /* we clear debugctl to make sure DS
-                * is not in use when we change it */
-               debugctl = 0;
-               update_debugctlmsr(0);
-               wrmsrl(MSR_IA32_DS_AREA, next->ds_area_msr);
+
+#ifdef CONFIG_X86_DS
+       {
+               unsigned long ds_prev = 0, ds_next = 0;
+
+               if (prev->ds_ctx)
+                       ds_prev = (unsigned long)prev->ds_ctx->ds;
+               if (next->ds_ctx)
+                       ds_next = (unsigned long)next->ds_ctx->ds;
+
+               if (ds_next != ds_prev) {
+                       /*
+                        * We clear debugctl to make sure DS
+                        * is not in use when we change it:
+                        */
+                       debugctl = 0;
+                       update_debugctlmsr(0);
+                       wrmsrl(MSR_IA32_DS_AREA, ds_next);
+               }
        }
+#endif /* CONFIG_X86_DS */
 
        if (next->debugctlmsr != debugctl)
                update_debugctlmsr(next->debugctlmsr);
@@ -516,13 +538,13 @@ static inline void __switch_to_xtra(struct task_struct *prev_p,
                memset(tss->io_bitmap, 0xff, prev->io_bitmap_max);
        }
 
-#ifdef X86_BTS
+#ifdef CONFIG_X86_PTRACE_BTS
        if (test_tsk_thread_flag(prev_p, TIF_BTS_TRACE_TS))
                ptrace_bts_take_timestamp(prev_p, BTS_TASK_DEPARTS);
 
        if (test_tsk_thread_flag(next_p, TIF_BTS_TRACE_TS))
                ptrace_bts_take_timestamp(next_p, BTS_TASK_ARRIVES);
-#endif
+#endif /* CONFIG_X86_PTRACE_BTS */
 }
 
 /*