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-rw-r--r--arch/x86/kernel/process.c18
1 files changed, 10 insertions, 8 deletions
diff --git a/arch/x86/kernel/process.c b/arch/x86/kernel/process.c
index 28ad9f4d8b94..eccdb57094e3 100644
--- a/arch/x86/kernel/process.c
+++ b/arch/x86/kernel/process.c
@@ -20,7 +20,6 @@
20#include <asm/idle.h> 20#include <asm/idle.h>
21#include <asm/uaccess.h> 21#include <asm/uaccess.h>
22#include <asm/i387.h> 22#include <asm/i387.h>
23#include <asm/ds.h>
24#include <asm/debugreg.h> 23#include <asm/debugreg.h>
25 24
26unsigned long idle_halt; 25unsigned long idle_halt;
@@ -50,8 +49,6 @@ void free_thread_xstate(struct task_struct *tsk)
50 kmem_cache_free(task_xstate_cachep, tsk->thread.xstate); 49 kmem_cache_free(task_xstate_cachep, tsk->thread.xstate);
51 tsk->thread.xstate = NULL; 50 tsk->thread.xstate = NULL;
52 } 51 }
53
54 WARN(tsk->thread.ds_ctx, "leaking DS context\n");
55} 52}
56 53
57void free_thread_info(struct thread_info *ti) 54void 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,
198 prev = &prev_p->thread; 195 prev = &prev_p->thread;
199 next = &next_p->thread; 196 next = &next_p->thread;
200 197
201 if (test_tsk_thread_flag(next_p, TIF_DS_AREA_MSR) || 198 if (test_tsk_thread_flag(prev_p, TIF_BLOCKSTEP) ^
202 test_tsk_thread_flag(prev_p, TIF_DS_AREA_MSR)) 199 test_tsk_thread_flag(next_p, TIF_BLOCKSTEP)) {
203 ds_switch_to(prev_p, next_p); 200 unsigned long debugctl = get_debugctlmsr();
204 else if (next->debugctlmsr != prev->debugctlmsr) 201
205 update_debugctlmsr(next->debugctlmsr); 202 debugctl &= ~DEBUGCTLMSR_BTF;
203 if (test_tsk_thread_flag(next_p, TIF_BLOCKSTEP))
204 debugctl |= DEBUGCTLMSR_BTF;
205
206 update_debugctlmsr(debugctl);
207 }
206 208
207 if (test_tsk_thread_flag(prev_p, TIF_NOTSC) ^ 209 if (test_tsk_thread_flag(prev_p, TIF_NOTSC) ^
208 test_tsk_thread_flag(next_p, TIF_NOTSC)) { 210 test_tsk_thread_flag(next_p, TIF_NOTSC)) {