x86: disable BTS ptrace extensions for now

revert the BTS ptrace extension for now.

based on general objections from Roland McGrath:

    http://lkml.org/lkml/2008/2/21/323

we'll let the BTS functionality cook some more and re-enable
it in v2.6.26. We'll leave the dead code around to help the
development of this code.

(X86_BTS is not defined at the moment)

Signed-off-by: Ingo Molnar <mingo@elte.hu>

diff --git a/arch/x86/kernel/process_32.c b/arch/x86/kernel/process_32.c
index a7d50a5..be3c7a2 100644 (file)
--- a/arch/x86/kernel/process_32.c
+++ b/arch/x86/kernel/process_32.c
@@ -603,11 +603,13 @@ __switch_to_xtra(struct task_struct *prev_p, struct task_struct *next_p,
        }
 #endif
 
+#ifdef X86_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
 
 
        if (!test_tsk_thread_flag(next_p, TIF_IO_BITMAP)) {

diff --git a/arch/x86/kernel/process_64.c b/arch/x86/kernel/process_64.c
index 43f2877..3baf9b9 100644 (file)
--- a/arch/x86/kernel/process_64.c
+++ b/arch/x86/kernel/process_64.c
@@ -604,11 +604,13 @@ static inline void __switch_to_xtra(struct task_struct *prev_p,
                memset(tss->io_bitmap, 0xff, prev->io_bitmap_max);
        }
 
+#ifdef X86_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
 }
 
 /*

diff --git a/arch/x86/kernel/ptrace.c b/arch/x86/kernel/ptrace.c
index d862e39..f41fdc9 100644 (file)
--- a/arch/x86/kernel/ptrace.c
+++ b/arch/x86/kernel/ptrace.c
@@ -544,6 +544,8 @@ static int ptrace_set_debugreg(struct task_struct *child,
        return 0;
 }
 
+#ifdef X86_BTS
+
 static int ptrace_bts_get_size(struct task_struct *child)
 {
        if (!child->thread.ds_area_msr)
@@ -826,6 +828,7 @@ void ptrace_bts_take_timestamp(struct task_struct *tsk,
 
        ptrace_bts_write_record(tsk, &rec);
 }
+#endif /* X86_BTS */
 
 /*
  * Called by kernel/ptrace.c when detaching..
@@ -839,7 +842,9 @@ void ptrace_disable(struct task_struct *child)
        clear_tsk_thread_flag(child, TIF_SYSCALL_EMU);
 #endif
        if (child->thread.ds_area_msr) {
+#ifdef X86_BTS
                ptrace_bts_realloc(child, 0, 0);
+#endif
                child->thread.debugctlmsr &= ~ds_debugctl_mask();
                if (!child->thread.debugctlmsr)
                        clear_tsk_thread_flag(child, TIF_DEBUGCTLMSR);
@@ -961,6 +966,10 @@ long arch_ptrace(struct task_struct *child, long request, long addr, long data)
                break;
 #endif
 
+       /*
+        * These bits need more cooking - not enabled yet:
+        */
+#ifdef X86_BTS
        case PTRACE_BTS_CONFIG:
                ret = ptrace_bts_config
                        (child, data, (struct ptrace_bts_config __user *)addr);
@@ -988,6 +997,7 @@ long arch_ptrace(struct task_struct *child, long request, long addr, long data)
                ret = ptrace_bts_drain
                        (child, data, (struct bts_struct __user *) addr);
                break;
+#endif
 
        default:
                ret = ptrace_request(child, request, addr, data);
@@ -1226,12 +1236,14 @@ asmlinkage long sys32_ptrace(long request, u32 pid, u32 addr, u32 data)
        case PTRACE_SETOPTIONS:
        case PTRACE_SET_THREAD_AREA:
        case PTRACE_GET_THREAD_AREA:
+#ifdef X86_BTS
        case PTRACE_BTS_CONFIG:
        case PTRACE_BTS_STATUS:
        case PTRACE_BTS_SIZE:
        case PTRACE_BTS_GET:
        case PTRACE_BTS_CLEAR:
        case PTRACE_BTS_DRAIN:
+#endif
                return sys_ptrace(request, pid, addr, data);
 
        default: