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uprobes: Fold uprobe_reset_state() into uprobe_dup_mmap() 

Now that we have uprobe_dup_mmap() we can fold uprobe_reset_state()
into the new hook and remove it. mmput()->uprobe_clear_state() can't
be called before dup_mmap().

Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Acked-by: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
This commit is contained in:
Oleg Nesterov 2012-08-08 17:17:46 +02:00
parent f8ac4ec9c0
commit 61559a8165
3 changed files with 2 additions and 14 deletions
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4
include/linux/uprobes.h
View File

@ -118,7 +118,6 @@ extern void uprobe_notify_resume(struct pt_regs *regs);
extern bool uprobe_deny_signal(void);
extern bool __weak arch_uprobe_skip_sstep(struct arch_uprobe *aup, struct pt_regs *regs);
extern void uprobe_clear_state(struct mm_struct *mm);
extern void uprobe_reset_state(struct mm_struct *mm);
#else /* !CONFIG_UPROBES */
struct uprobes_state {
};
@ -163,8 +162,5 @@ static inline void uprobe_copy_process(struct task_struct *t)
static inline void uprobe_clear_state(struct mm_struct *mm)
{
}
static inline void uprobe_reset_state(struct mm_struct *mm)
{
}
#endif /* !CONFIG_UPROBES */
#endif /* _LINUX_UPROBES_H */

10
kernel/events/uprobes.c
View File

@ -1148,16 +1148,10 @@ void uprobe_clear_state(struct mm_struct *mm)
kfree(area);
}
/*
* uprobe_reset_state - Free the area allocated for slots.
*/
void uprobe_reset_state(struct mm_struct *mm)
{
mm->uprobes_state.xol_area = NULL;
}
void uprobe_dup_mmap(struct mm_struct *oldmm, struct mm_struct *newmm)
{
newmm->uprobes_state.xol_area = NULL;
if (test_bit(MMF_HAS_UPROBES, &oldmm->flags))
set_bit(MMF_HAS_UPROBES, &newmm->flags);
}

2
kernel/fork.c
View File

@ -837,8 +837,6 @@ struct mm_struct *dup_mm(struct task_struct *tsk)
#ifdef CONFIG_TRANSPARENT_HUGEPAGE
mm->pmd_huge_pte = NULL;
#endif
uprobe_reset_state(mm);
if (!mm_init(mm, tsk))
goto fail_nomem;