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uprobes: Do not use -EEXIST in install_breakpoint() paths 

-EEXIST from install_breakpoint() no longer makes sense, all
callers should simply treat it as "success". Change the code
to return zero and simplify register_for_each_vma().

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 17:35:08 +02:00
parent 5e5be71ab3
commit 78f7411668
1 changed files with 5 additions and 11 deletions
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16
kernel/events/uprobes.c
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@ -332,7 +332,7 @@ int __weak set_swbp(struct arch_uprobe *auprobe, struct mm_struct *mm, unsigned
*/
result = is_swbp_at_addr(mm, vaddr);
if (result == 1)
return -EEXIST;
return 0;
if (result)
return result;
@ -657,7 +657,7 @@ install_breakpoint(struct uprobe *uprobe, struct mm_struct *mm,
* Hence behave as if probe already existed.
*/
if (!uprobe->consumers)
return -EEXIST;
return 0;
if (!(uprobe->flags & UPROBE_COPY_INSN)) {
ret = copy_insn(uprobe, vma->vm_file);
@ -817,17 +817,11 @@ static int register_for_each_vma(struct uprobe *uprobe, bool is_register)
vaddr_to_offset(vma, info->vaddr) != uprobe->offset)
goto unlock;
if (is_register) {
if (is_register)
err = install_breakpoint(uprobe, mm, vma, info->vaddr);
/*
* We can race against uprobe_mmap(), see the
* comment near uprobe_hash().
*/
if (err == -EEXIST)
err = 0;
} else {
else
remove_breakpoint(uprobe, mm, info->vaddr);
}
unlock:
up_write(&mm->mmap_sem);
free: