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trimming task_work: kill ->data

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get rid of the only user of ->data; this is _not_ the final variant - in the
end we'll have task_work and rcu_head identical and just use cred->rcu,
at which point the separate allocation will be gone completely.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2012-06-26 22:10:04 +04:00
parent 7266702805
commit 41f9d29f09
5 changed files with 17 additions and 12 deletions
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4
include/linux/task_work.h
View File

@ -10,14 +10,12 @@ typedef void (*task_work_func_t)(struct task_work *);
struct task_work {
struct hlist_node hlist;
task_work_func_t func;
void *data;
};
static inline void
init_task_work(struct task_work *twork, task_work_func_t func, void *data)
init_task_work(struct task_work *twork, task_work_func_t func)
{
twork->func = func;
twork->data = data;
}
int task_work_add(struct task_struct *task, struct task_work *twork, bool);

2
kernel/irq/manage.c
View File

@ -830,7 +830,7 @@ static int irq_thread(void *data)
sched_setscheduler(current, SCHED_FIFO, &param);
init_task_work(&on_exit_work, irq_thread_dtor, NULL);
init_task_work(&on_exit_work, irq_thread_dtor);
task_work_add(current, &on_exit_work, false);
while (!irq_wait_for_interrupt(action)) {

4
security/keys/internal.h
View File

@ -148,6 +148,10 @@ extern key_ref_t lookup_user_key(key_serial_t id, unsigned long flags,
#define KEY_LOOKUP_PARTIAL 0x02
#define KEY_LOOKUP_FOR_UNLINK 0x04
struct kludge { /* this will die off very soon */
struct task_work twork;
struct cred *cred;
};
extern long join_session_keyring(const char *name);
extern void key_change_session_keyring(struct task_work *twork);

14
security/keys/keyctl.c
View File

@ -1456,7 +1456,8 @@ long keyctl_session_to_parent(void)
{
struct task_struct *me, *parent;
const struct cred *mycred, *pcred;
struct task_work *newwork, *oldwork;
struct kludge *newwork;
struct task_work *oldwork;
key_ref_t keyring_r;
struct cred *cred;
int ret;
@ -1466,7 +1467,7 @@ long keyctl_session_to_parent(void)
return PTR_ERR(keyring_r);
ret = -ENOMEM;
newwork = kmalloc(sizeof(struct task_work), GFP_KERNEL);
newwork = kmalloc(sizeof(struct kludge), GFP_KERNEL);
if (!newwork)
goto error_keyring;
@ -1478,7 +1479,8 @@ long keyctl_session_to_parent(void)
goto error_newwork;
cred->tgcred->session_keyring = key_ref_to_ptr(keyring_r);
init_task_work(newwork, key_change_session_keyring, cred);
init_task_work(&newwork->twork, key_change_session_keyring);
newwork->cred = cred;
me = current;
rcu_read_lock();
@ -1527,18 +1529,18 @@ long keyctl_session_to_parent(void)
/* the replacement session keyring is applied just prior to userspace
* restarting */
ret = task_work_add(parent, newwork, true);
ret = task_work_add(parent, &newwork->twork, true);
if (!ret)
newwork = NULL;
unlock:
write_unlock_irq(&tasklist_lock);
rcu_read_unlock();
if (oldwork) {
put_cred(oldwork->data);
put_cred(container_of(oldwork, struct kludge, twork)->cred);
kfree(oldwork);
}
if (newwork) {
put_cred(newwork->data);
put_cred(newwork->cred);
kfree(newwork);
}
return ret;

5
security/keys/process_keys.c
View File

@ -837,9 +837,10 @@ error:
void key_change_session_keyring(struct task_work *twork)
{
const struct cred *old = current_cred();
struct cred *new = twork->data;
struct kludge *p = container_of(twork, struct kludge, twork);
struct cred *new = p->cred;
kfree(twork);
kfree(p);
if (unlikely(current->flags & PF_EXITING)) {
put_cred(new);
return;