tracing/user_events: Rename link fields for clarity

Currently most list_head fields of various structs within user_events
are simply named link. This causes folks to keep additional context in
their head when working with the code, which can be confusing.

Instead of using link, describe what the actual link is, for example:
list_del_rcu(&mm->link);

Changes into:
list_del_rcu(&mm->mms_link);

The reader now is given a hint the link is to the mms global list
instead of having to remember or spot check within the code.

Link: https://lkml.kernel.org/r/20230519230741.669-4-beaub@linux.microsoft.com
Link: https://lore.kernel.org/linux-trace-kernel/CAHk-=wicngggxVpbnrYHjRTwGE0WYscPRM+L2HO2BF8ia1EXgQ@mail.gmail.com/
Suggested-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Beau Belgrave <beaub@linux.microsoft.com>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>

diff --git a/include/linux/user_events.h b/include/linux/user_events.h
index 2847f5a..17d452b 100644 (file)
--- a/include/linux/user_events.h
+++ b/include/linux/user_events.h
@@ -17,7 +17,7 @@
 
 #ifdef CONFIG_USER_EVENTS
 struct user_event_mm {
-       struct list_head        link;
+       struct list_head        mms_link;
        struct list_head        enablers;
        struct mm_struct        *mm;
        struct user_event_mm    *next;

diff --git a/kernel/trace/trace_events_user.c b/kernel/trace/trace_events_user.c
index d34a596..238c7a0 100644 (file)
--- a/kernel/trace/trace_events_user.c
+++ b/kernel/trace/trace_events_user.c
@@ -96,7 +96,7 @@ struct user_event {
  * these to track enablement sites that are tied to an event.
  */
 struct user_event_enabler {
-       struct list_head        link;
+       struct list_head        mm_enablers_link;
        struct user_event       *event;
        unsigned long           addr;
 
@@ -155,7 +155,7 @@ struct user_event_file_info {
 #define VALIDATOR_REL (1 << 1)
 
 struct user_event_validator {
-       struct list_head        link;
+       struct list_head        user_event_link;
        int                     offset;
        int                     flags;
 };
@@ -261,7 +261,7 @@ error:
 
 static void user_event_enabler_destroy(struct user_event_enabler *enabler)
 {
-       list_del_rcu(&enabler->link);
+       list_del_rcu(&enabler->mm_enablers_link);
 
        /* No longer tracking the event via the enabler */
        refcount_dec(&enabler->event->refcnt);
@@ -440,7 +440,7 @@ static bool user_event_enabler_exists(struct user_event_mm *mm,
 {
        struct user_event_enabler *enabler;
 
-       list_for_each_entry(enabler, &mm->enablers, link) {
+       list_for_each_entry(enabler, &mm->enablers, mm_enablers_link) {
                if (enabler->addr == uaddr && ENABLE_BIT(enabler) == bit)
                        return true;
        }
@@ -461,7 +461,7 @@ static void user_event_enabler_update(struct user_event *user)
                next = mm->next;
                mmap_read_lock(mm->mm);
 
-               list_for_each_entry(enabler, &mm->enablers, link) {
+               list_for_each_entry(enabler, &mm->enablers, mm_enablers_link) {
                        if (enabler->event == user) {
                                attempt = 0;
                                user_event_enabler_write(mm, enabler, true, &attempt);
@@ -497,7 +497,7 @@ static bool user_event_enabler_dup(struct user_event_enabler *orig,
        refcount_inc(&enabler->event->refcnt);
 
        /* Enablers not exposed yet, RCU not required */
-       list_add(&enabler->link, &mm->enablers);
+       list_add(&enabler->mm_enablers_link, &mm->enablers);
 
        return true;
 }
@@ -527,13 +527,15 @@ static struct user_event_mm *user_event_mm_get_all(struct user_event *user)
         */
        rcu_read_lock();
 
-       list_for_each_entry_rcu(mm, &user_event_mms, link)
-               list_for_each_entry_rcu(enabler, &mm->enablers, link)
+       list_for_each_entry_rcu(mm, &user_event_mms, mms_link) {
+               list_for_each_entry_rcu(enabler, &mm->enablers, mm_enablers_link) {
                        if (enabler->event == user) {
                                mm->next = found;
                                found = user_event_mm_get(mm);
                                break;
                        }
+               }
+       }
 
        rcu_read_unlock();
 
@@ -572,7 +574,7 @@ static void user_event_mm_attach(struct user_event_mm *user_mm, struct task_stru
        unsigned long flags;
 
        spin_lock_irqsave(&user_event_mms_lock, flags);
-       list_add_rcu(&user_mm->link, &user_event_mms);
+       list_add_rcu(&user_mm->mms_link, &user_event_mms);
        spin_unlock_irqrestore(&user_event_mms_lock, flags);
 
        t->user_event_mm = user_mm;
@@ -601,7 +603,7 @@ static void user_event_mm_destroy(struct user_event_mm *mm)
 {
        struct user_event_enabler *enabler, *next;
 
-       list_for_each_entry_safe(enabler, next, &mm->enablers, link)
+       list_for_each_entry_safe(enabler, next, &mm->enablers, mm_enablers_link)
                user_event_enabler_destroy(enabler);
 
        mmdrop(mm->mm);
@@ -638,7 +640,7 @@ void user_event_mm_remove(struct task_struct *t)
 
        /* Remove the mm from the list, so it can no longer be enabled */
        spin_lock_irqsave(&user_event_mms_lock, flags);
-       list_del_rcu(&mm->link);
+       list_del_rcu(&mm->mms_link);
        spin_unlock_irqrestore(&user_event_mms_lock, flags);
 
        /*
@@ -686,9 +688,10 @@ void user_event_mm_dup(struct task_struct *t, struct user_event_mm *old_mm)
 
        rcu_read_lock();
 
-       list_for_each_entry_rcu(enabler, &old_mm->enablers, link)
+       list_for_each_entry_rcu(enabler, &old_mm->enablers, mm_enablers_link) {
                if (!user_event_enabler_dup(enabler, mm))
                        goto error;
+       }
 
        rcu_read_unlock();
 
@@ -757,7 +760,7 @@ retry:
         */
        if (!*write_result) {
                refcount_inc(&enabler->event->refcnt);
-               list_add_rcu(&enabler->link, &user_mm->enablers);
+               list_add_rcu(&enabler->mm_enablers_link, &user_mm->enablers);
        }
 
        mutex_unlock(&event_mutex);
@@ -913,8 +916,8 @@ static void user_event_destroy_validators(struct user_event *user)
        struct user_event_validator *validator, *next;
        struct list_head *head = &user->validators;
 
-       list_for_each_entry_safe(validator, next, head, link) {
-               list_del(&validator->link);
+       list_for_each_entry_safe(validator, next, head, user_event_link) {
+               list_del(&validator->user_event_link);
                kfree(validator);
        }
 }
@@ -968,7 +971,7 @@ add_validator:
        validator->offset = offset;
 
        /* Want sequential access when validating */
-       list_add_tail(&validator->link, &user->validators);
+       list_add_tail(&validator->user_event_link, &user->validators);
 
 add_field:
        field->type = type;
@@ -1358,7 +1361,7 @@ static int user_event_validate(struct user_event *user, void *data, int len)
        void *pos, *end = data + len;
        u32 loc, offset, size;
 
-       list_for_each_entry(validator, head, link) {
+       list_for_each_entry(validator, head, user_event_link) {
                pos = data + validator->offset;
 
                /* Already done min_size check, no bounds check here */
@@ -2279,7 +2282,7 @@ static long user_events_ioctl_unreg(unsigned long uarg)
         */
        mutex_lock(&event_mutex);
 
-       list_for_each_entry_safe(enabler, next, &mm->enablers, link)
+       list_for_each_entry_safe(enabler, next, &mm->enablers, mm_enablers_link) {
                if (enabler->addr == reg.disable_addr &&
                    ENABLE_BIT(enabler) == reg.disable_bit) {
                        set_bit(ENABLE_VAL_FREEING_BIT, ENABLE_BITOPS(enabler));
@@ -2290,6 +2293,7 @@ static long user_events_ioctl_unreg(unsigned long uarg)
                        /* Removed at least one */
                        ret = 0;
                }
+       }
 
        mutex_unlock(&event_mutex);