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x86: disable BTS ptrace extensions for now

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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>
This commit is contained in:
Ingo Molnar 2008-02-26 09:40:27 +01:00
parent 8be8f54bae
commit b4ef95de00
3 changed files with 16 additions and 0 deletions
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2
arch/x86/kernel/process_32.c
View file

@ -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)) {

2
arch/x86/kernel/process_64.c
View file

@ -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
}
/*

12
arch/x86/kernel/ptrace.c
View file

@ -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: