-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 <o...@redhat.com>
---
kernel/events/uprobes.c | 16 +++++-----------
1 files changed, 5 insertions(+), 11 deletions(-)
diff --git a/kernel/events/uprobes.c b/kernel/events/uprobes.c
index 2e269d1..309309e 100644
--- a/kernel/events/uprobes.c
+++ b/kernel/events/uprobes.c
@@ -334,7 +334,7 @@ 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;
@@ -659,7 +659,7 @@ 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);
@@ -819,17 +819,11 @@ 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:
--
1.5.5.1
--
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