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author | Markus Metzger <markus.t.metzger@intel.com> | 2008-12-19 15:10:24 +0100 |
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committer | Ingo Molnar <mingo@elte.hu> | 2008-12-20 09:15:46 +0100 |
commit | bf53de907dfdaac178c92d774aae7370d7b97d20 (patch) | |
tree | 738a07a8b4b22f7bb8ec2029c9ea9c635db6c62a /arch/x86/kernel/ds.c | |
parent | 30cd324e9787ccc9a5ede59742d5409857550692 (diff) | |
download | op-kernel-dev-bf53de907dfdaac178c92d774aae7370d7b97d20.zip op-kernel-dev-bf53de907dfdaac178c92d774aae7370d7b97d20.tar.gz |
x86, bts: add fork and exit handling
Impact: introduce new ptrace facility
Add arch_ptrace_untrace() function that is called when the tracer
detaches (either voluntarily or when the tracing task dies);
ptrace_disable() is only called on a voluntary detach.
Add ptrace_fork() and arch_ptrace_fork(). They are called when a
traced task is forked.
Clear DS and BTS related fields on fork.
Release DS resources and reclaim memory in ptrace_untrace(). This
releases resources already when the tracing task dies. We used to do
that when the traced task dies.
Signed-off-by: Markus Metzger <markus.t.metzger@intel.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'arch/x86/kernel/ds.c')
-rw-r--r-- | arch/x86/kernel/ds.c | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/arch/x86/kernel/ds.c b/arch/x86/kernel/ds.c index 98d271e..da91701 100644 --- a/arch/x86/kernel/ds.c +++ b/arch/x86/kernel/ds.c @@ -1017,3 +1017,14 @@ void ds_switch_to(struct task_struct *prev, struct task_struct *next) update_debugctlmsr(next->thread.debugctlmsr); } + +void ds_copy_thread(struct task_struct *tsk, struct task_struct *father) +{ + clear_tsk_thread_flag(tsk, TIF_DS_AREA_MSR); + tsk->thread.ds_ctx = NULL; +} + +void ds_exit_thread(struct task_struct *tsk) +{ + WARN_ON(tsk->thread.ds_ctx); +} |