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ptrace: cleanup ptrace_init_task()->ptrace_link() path

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No functional changes.

ptrace_init_task() looks confusing, as if we always auto-attach when "bool
ptrace" argument is true, while in fact we attach only if current is
traced.

Make the code more explicit and kill now unused ptrace_link().

Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Acked-by: Roland McGrath <roland@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Oleg Nesterov 2009-12-15 16:47:15 -08:00 committed by Linus Torvalds
parent aa20d489ce
commit c6a47cc2cc
1 changed files with 3 additions and 8 deletions
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11
include/linux/ptrace.h
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@ -105,12 +105,7 @@ static inline int ptrace_reparented(struct task_struct *child)
{
return child->real_parent != child->parent;
}
static inline void ptrace_link(struct task_struct *child,
struct task_struct *new_parent)
{
if (unlikely(child->ptrace))
__ptrace_link(child, new_parent);
}
static inline void ptrace_unlink(struct task_struct *child)
{
if (unlikely(child->ptrace))
@ -169,9 +164,9 @@ static inline void ptrace_init_task(struct task_struct *child, bool ptrace)
INIT_LIST_HEAD(&child->ptraced);
child->parent = child->real_parent;
child->ptrace = 0;
if (unlikely(ptrace)) {
if (unlikely(ptrace) && (current->ptrace & PT_PTRACED)) {
child->ptrace = current->ptrace;
ptrace_link(child, current->parent);
__ptrace_link(child, current->parent);
}
}