This reverts commit 83a90bb1345767f0cb96d242fd8b9db44b2b0e17.
The method that only allowing the topmost patch on the stack to be
enabled or disabled is unreasonable. Such as the following case:
- do live patch1
- disable patch1
- do live patch2 //error
Now, we will never be able to do new live patch unless disabing the
patch1 although there is no dependencies.
Signed-off-by: Li Bin <huawei.libin@xxxxxxxxxx>
---
kernel/livepatch/core.c | 10 ----------
1 files changed, 0 insertions(+), 10 deletions(-)
diff --git a/kernel/livepatch/core.c b/kernel/livepatch/core.c
index bc05d39..7861ed2 100644
--- a/kernel/livepatch/core.c
+++ b/kernel/livepatch/core.c
@@ -468,11 +468,6 @@ static int __klp_disable_patch(struct klp_patch *patch)
struct klp_object *obj;
int ret;
- /* enforce stacking: only the last enabled patch can be disabled */
- if (!list_is_last(&patch->list, &klp_patches) &&
- list_next_entry(patch, list)->state == KLP_ENABLED)
- return -EBUSY;
-
pr_notice("disabling patch '%s'\n", patch->mod->name);
for (obj = patch->objs; obj->funcs; obj++) {
@@ -529,11 +524,6 @@ static int __klp_enable_patch(struct klp_patch *patch)
if (WARN_ON(patch->state != KLP_DISABLED))
return -EINVAL;
- /* enforce stacking: only the first disabled patch can be enabled */
- if (patch->list.prev != &klp_patches &&
- list_prev_entry(patch, list)->state == KLP_DISABLED)
- return -EBUSY;
-
pr_notice_once("tainting kernel with TAINT_LIVEPATCH\n");
add_taint(TAINT_LIVEPATCH, LOCKDEP_STILL_OK);
--
1.7.1
--
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