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Message-Id: <20240507021714.29689-2-zhangwarden@gmail.com>
Date: Tue, 7 May 2024 10:17:14 +0800
From: zhangwarden@...il.com
To: jpoimboe@...nel.org,
mbenes@...e.cz,
jikos@...nel.org,
pmladek@...e.com,
joe.lawrence@...hat.com
Cc: live-patching@...r.kernel.org,
linux-kernel@...r.kernel.org,
Wardenjohn <zhangwarden@...il.com>
Subject: [PATCH 1/1] livepatch: Rename KLP_* to KLP_TRANSITION_*
From: Wardenjohn <zhangwarden@...il.com>
The original macros of KLP_* is about the state of the transition.
Rename macros of KLP_* to KLP_TRANSITION_* to fix the confusing
description of klp transition state.
Signed-off-by: Wardenjohn <zhangwarden@...il.com>
---
include/linux/livepatch.h | 6 ++--
init/init_task.c | 2 +-
kernel/livepatch/core.c | 5 ++--
kernel/livepatch/patch.c | 4 +--
kernel/livepatch/transition.c | 54 +++++++++++++++++------------------
5 files changed, 36 insertions(+), 35 deletions(-)
diff --git a/include/linux/livepatch.h b/include/linux/livepatch.h
index 9b9b38e89563..25db447367a3 100644
--- a/include/linux/livepatch.h
+++ b/include/linux/livepatch.h
@@ -18,9 +18,9 @@
#if IS_ENABLED(CONFIG_LIVEPATCH)
/* task patch states */
-#define KLP_UNDEFINED -1
-#define KLP_UNPATCHED 0
-#define KLP_PATCHED 1
+#define KLP_TRANSITION_IDLE -1 /* idle, no transition in progress */
+#define KLP_TRANSITION_UNPATCHED 0 /* transitioning to unpatched state */
+#define KLP_TRANSITION_PATCHED 1 /* transitioning to patched state */
/**
* struct klp_func - function structure for live patching
diff --git a/init/init_task.c b/init/init_task.c
index 2558b719e053..eeb110c65fe2 100644
--- a/init/init_task.c
+++ b/init/init_task.c
@@ -199,7 +199,7 @@ struct task_struct init_task __aligned(L1_CACHE_BYTES) = {
.trace_recursion = 0,
#endif
#ifdef CONFIG_LIVEPATCH
- .patch_state = KLP_UNDEFINED,
+ .patch_state = KLP_TRANSITION_IDLE,
#endif
#ifdef CONFIG_SECURITY
.security = NULL,
diff --git a/kernel/livepatch/core.c b/kernel/livepatch/core.c
index ecbc9b6aba3a..39b767b22cd7 100644
--- a/kernel/livepatch/core.c
+++ b/kernel/livepatch/core.c
@@ -40,6 +40,7 @@ DEFINE_MUTEX(klp_mutex);
/*
* Actively used patches: enabled or in transition. Note that replaced
* or disabled patches are not listed even though the related kernel
+a
* module still can be loaded.
*/
LIST_HEAD(klp_patches);
@@ -973,7 +974,7 @@ static int __klp_disable_patch(struct klp_patch *patch)
if (klp_transition_patch)
return -EBUSY;
- klp_init_transition(patch, KLP_UNPATCHED);
+ klp_init_transition(patch, KLP_TRANSITION_UNPATCHED);
klp_for_each_object(patch, obj)
if (obj->patched)
@@ -1008,7 +1009,7 @@ static int __klp_enable_patch(struct klp_patch *patch)
pr_notice("enabling patch '%s'\n", patch->mod->name);
- klp_init_transition(patch, KLP_PATCHED);
+ klp_init_transition(patch, KLP_TRANSITION_PATCHED);
/*
* Enforce the order of the func->transition writes in
diff --git a/kernel/livepatch/patch.c b/kernel/livepatch/patch.c
index 4152c71507e2..90408500e5a3 100644
--- a/kernel/livepatch/patch.c
+++ b/kernel/livepatch/patch.c
@@ -95,9 +95,9 @@ static void notrace klp_ftrace_handler(unsigned long ip,
patch_state = current->patch_state;
- WARN_ON_ONCE(patch_state == KLP_UNDEFINED);
+ WARN_ON_ONCE(patch_state == KLP_TRANSITION_IDLE);
- if (patch_state == KLP_UNPATCHED) {
+ if (patch_state == KLP_TRANSITION_UNPATCHED) {
/*
* Use the previously patched version of the function.
* If no previous patches exist, continue with the
diff --git a/kernel/livepatch/transition.c b/kernel/livepatch/transition.c
index e54c3d60a904..ba069459c101 100644
--- a/kernel/livepatch/transition.c
+++ b/kernel/livepatch/transition.c
@@ -23,7 +23,7 @@ static DEFINE_PER_CPU(unsigned long[MAX_STACK_ENTRIES], klp_stack_entries);
struct klp_patch *klp_transition_patch;
-static int klp_target_state = KLP_UNDEFINED;
+static int klp_target_state = KLP_TRANSITION_IDLE;
static unsigned int klp_signals_cnt;
@@ -96,16 +96,16 @@ static void klp_complete_transition(void)
pr_debug("'%s': completing %s transition\n",
klp_transition_patch->mod->name,
- klp_target_state == KLP_PATCHED ? "patching" : "unpatching");
+ klp_target_state == KLP_TRANSITION_PATCHED ? "patching" : "unpatching");
- if (klp_transition_patch->replace && klp_target_state == KLP_PATCHED) {
+ if (klp_transition_patch->replace && klp_target_state == KLP_TRANSITION_PATCHED) {
klp_unpatch_replaced_patches(klp_transition_patch);
klp_discard_nops(klp_transition_patch);
}
- if (klp_target_state == KLP_UNPATCHED) {
+ if (klp_target_state == KLP_TRANSITION_UNPATCHED) {
/*
- * All tasks have transitioned to KLP_UNPATCHED so we can now
+ * All tasks have transitioned to KLP_TRANSITION_UNPATCHED so we can now
* remove the new functions from the func_stack.
*/
klp_unpatch_objects(klp_transition_patch);
@@ -123,36 +123,36 @@ static void klp_complete_transition(void)
klp_for_each_func(obj, func)
func->transition = false;
- /* Prevent klp_ftrace_handler() from seeing KLP_UNDEFINED state */
- if (klp_target_state == KLP_PATCHED)
+ /* Prevent klp_ftrace_handler() from seeing KLP_TRANSITION_IDLE state */
+ if (klp_target_state == KLP_TRANSITION_PATCHED)
klp_synchronize_transition();
read_lock(&tasklist_lock);
for_each_process_thread(g, task) {
WARN_ON_ONCE(test_tsk_thread_flag(task, TIF_PATCH_PENDING));
- task->patch_state = KLP_UNDEFINED;
+ task->patch_state = KLP_TRANSITION_IDLE;
}
read_unlock(&tasklist_lock);
for_each_possible_cpu(cpu) {
task = idle_task(cpu);
WARN_ON_ONCE(test_tsk_thread_flag(task, TIF_PATCH_PENDING));
- task->patch_state = KLP_UNDEFINED;
+ task->patch_state = KLP_TRANSITION_IDLE;
}
klp_for_each_object(klp_transition_patch, obj) {
if (!klp_is_object_loaded(obj))
continue;
- if (klp_target_state == KLP_PATCHED)
+ if (klp_target_state == KLP_TRANSITION_PATCHED)
klp_post_patch_callback(obj);
- else if (klp_target_state == KLP_UNPATCHED)
+ else if (klp_target_state == KLP_TRANSITION_UNPATCHED)
klp_post_unpatch_callback(obj);
}
pr_notice("'%s': %s complete\n", klp_transition_patch->mod->name,
- klp_target_state == KLP_PATCHED ? "patching" : "unpatching");
+ klp_target_state == KLP_TRANSITION_PATCHED ? "patching" : "unpatching");
- klp_target_state = KLP_UNDEFINED;
+ klp_target_state = KLP_TRANSITION_IDLE;
klp_transition_patch = NULL;
}
@@ -164,13 +164,13 @@ static void klp_complete_transition(void)
*/
void klp_cancel_transition(void)
{
- if (WARN_ON_ONCE(klp_target_state != KLP_PATCHED))
+ if (WARN_ON_ONCE(klp_target_state != KLP_TRANSITION_PATCHED))
return;
pr_debug("'%s': canceling patching transition, going to unpatch\n",
klp_transition_patch->mod->name);
- klp_target_state = KLP_UNPATCHED;
+ klp_target_state = KLP_TRANSITION_UNPATCHED;
klp_complete_transition();
}
@@ -218,7 +218,7 @@ static int klp_check_stack_func(struct klp_func *func, unsigned long *entries,
struct klp_ops *ops;
int i;
- if (klp_target_state == KLP_UNPATCHED) {
+ if (klp_target_state == KLP_TRANSITION_UNPATCHED) {
/*
* Check for the to-be-unpatched function
* (the func itself).
@@ -455,7 +455,7 @@ void klp_try_complete_transition(void)
struct klp_patch *patch;
bool complete = true;
- WARN_ON_ONCE(klp_target_state == KLP_UNDEFINED);
+ WARN_ON_ONCE(klp_target_state == KLP_TRANSITION_IDLE);
/*
* Try to switch the tasks to the target patch state by walking their
@@ -532,11 +532,11 @@ void klp_start_transition(void)
struct task_struct *g, *task;
unsigned int cpu;
- WARN_ON_ONCE(klp_target_state == KLP_UNDEFINED);
+ WARN_ON_ONCE(klp_target_state == KLP_TRANSITION_IDLE);
pr_notice("'%s': starting %s transition\n",
klp_transition_patch->mod->name,
- klp_target_state == KLP_PATCHED ? "patching" : "unpatching");
+ klp_target_state == KLP_TRANSITION_PATCHED ? "patching" : "unpatching");
/*
* Mark all normal tasks as needing a patch state update. They'll
@@ -578,7 +578,7 @@ void klp_init_transition(struct klp_patch *patch, int state)
struct klp_func *func;
int initial_state = !state;
- WARN_ON_ONCE(klp_target_state != KLP_UNDEFINED);
+ WARN_ON_ONCE(klp_target_state != KLP_TRANSITION_IDLE);
klp_transition_patch = patch;
@@ -589,7 +589,7 @@ void klp_init_transition(struct klp_patch *patch, int state)
klp_target_state = state;
pr_debug("'%s': initializing %s transition\n", patch->mod->name,
- klp_target_state == KLP_PATCHED ? "patching" : "unpatching");
+ klp_target_state == KLP_TRANSITION_PATCHED ? "patching" : "unpatching");
/*
* Initialize all tasks to the initial patch state to prepare them for
@@ -597,7 +597,7 @@ void klp_init_transition(struct klp_patch *patch, int state)
*/
read_lock(&tasklist_lock);
for_each_process_thread(g, task) {
- WARN_ON_ONCE(task->patch_state != KLP_UNDEFINED);
+ WARN_ON_ONCE(task->patch_state != KLP_TRANSITION_IDLE);
task->patch_state = initial_state;
}
read_unlock(&tasklist_lock);
@@ -607,19 +607,19 @@ void klp_init_transition(struct klp_patch *patch, int state)
*/
for_each_possible_cpu(cpu) {
task = idle_task(cpu);
- WARN_ON_ONCE(task->patch_state != KLP_UNDEFINED);
+ WARN_ON_ONCE(task->patch_state != KLP_TRANSITION_IDLE);
task->patch_state = initial_state;
}
/*
* Enforce the order of the task->patch_state initializations and the
* func->transition updates to ensure that klp_ftrace_handler() doesn't
- * see a func in transition with a task->patch_state of KLP_UNDEFINED.
+ * see a func in transition with a task->patch_state of KLP_TRANSITION_IDLE.
*
* Also enforce the order of the klp_target_state write and future
* TIF_PATCH_PENDING writes to ensure klp_update_patch_state() and
* __klp_sched_try_switch() don't set a task->patch_state to
- * KLP_UNDEFINED.
+ * KLP_TRANSITION_IDLE.
*/
smp_wmb();
@@ -652,7 +652,7 @@ void klp_reverse_transition(void)
pr_debug("'%s': reversing transition from %s\n",
klp_transition_patch->mod->name,
- klp_target_state == KLP_PATCHED ? "patching to unpatching" :
+ klp_target_state == KLP_TRANSITION_PATCHED ? "patching to unpatching" :
"unpatching to patching");
/*
@@ -741,7 +741,7 @@ void klp_force_transition(void)
klp_update_patch_state(idle_task(cpu));
/* Set forced flag for patches being removed. */
- if (klp_target_state == KLP_UNPATCHED)
+ if (klp_target_state == KLP_TRANSITION_UNPATCHED)
klp_transition_patch->forced = true;
else if (klp_transition_patch->replace) {
klp_for_each_patch(patch) {
--
2.37.3
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