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tasklets API update for v5.9-rc1

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- Prepare for tasklet API modernization (Romain Perier, Allen Pais, Kees Cook)
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Merge tag 'tasklets-v5.9-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux

Pull tasklets API update from Kees Cook:
 "These are the infrastructure updates needed to support converting the
  tasklet API to something more modern (and hopefully for removal
  further down the road).

  There is a 300-patch series waiting in the wings to get set out to
  subsystem maintainers, but these changes need to be present in the
  kernel first. Since this has some treewide changes, I carried this
  series for -next instead of paining Thomas with it in -tip, but it's
  got his Ack.

  This is similar to the timer_struct modernization from a while back,
  but not nearly as messy (I hope). :)

   - Prepare for tasklet API modernization (Romain Perier, Allen Pais,
     Kees Cook)"

* tag 'tasklets-v5.9-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux:
  tasklet: Introduce new initialization API
  treewide: Replace DECLARE_TASKLET() with DECLARE_TASKLET_OLD()
  usb: gadget: udc: Avoid tasklet passing a global
This commit is contained in:
Linus Torvalds 2020-08-04 13:40:35 -07:00
commit 427714f258
17 changed files with 70 additions and 25 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/input/keyboard/omap-keypad.c
View File

@ -46,7 +46,7 @@ struct omap_kp {
unsigned short keymap[];
};
static DECLARE_TASKLET_DISABLED(kp_tasklet, omap_kp_tasklet, 0);
static DECLARE_TASKLET_DISABLED_OLD(kp_tasklet, omap_kp_tasklet);
static unsigned int *row_gpios;
static unsigned int *col_gpios;

2
drivers/input/serio/hil_mlc.c
View File

@ -77,7 +77,7 @@ static struct timer_list hil_mlcs_kicker;
static int hil_mlcs_probe;
static void hil_mlcs_process(unsigned long unused);
static DECLARE_TASKLET_DISABLED(hil_mlcs_tasklet, hil_mlcs_process, 0);
static DECLARE_TASKLET_DISABLED_OLD(hil_mlcs_tasklet, hil_mlcs_process);
/* #define HIL_MLC_DEBUG */

4
drivers/net/wan/farsync.c
View File

@ -569,8 +569,8 @@ static void do_bottom_half_rx(struct fst_card_info *card);
static void fst_process_tx_work_q(unsigned long work_q);
static void fst_process_int_work_q(unsigned long work_q);
static DECLARE_TASKLET(fst_tx_task, fst_process_tx_work_q, 0);
static DECLARE_TASKLET(fst_int_task, fst_process_int_work_q, 0);
static DECLARE_TASKLET_OLD(fst_tx_task, fst_process_tx_work_q);
static DECLARE_TASKLET_OLD(fst_int_task, fst_process_int_work_q);
static struct fst_card_info *fst_card_array[FST_MAX_CARDS];
static spinlock_t fst_work_q_lock;

2
drivers/s390/crypto/ap_bus.c
View File

@ -92,7 +92,7 @@ static DECLARE_WORK(ap_scan_work, ap_scan_bus);
* Tasklet & timer for AP request polling and interrupts
*/
static void ap_tasklet_fn(unsigned long);
static DECLARE_TASKLET(ap_tasklet, ap_tasklet_fn, 0);
static DECLARE_TASKLET_OLD(ap_tasklet, ap_tasklet_fn);
static DECLARE_WAIT_QUEUE_HEAD(ap_poll_wait);
static struct task_struct *ap_poll_kthread;
static DEFINE_MUTEX(ap_poll_thread_mutex);

2
drivers/staging/most/dim2/dim2.c
View File

@ -46,7 +46,7 @@ MODULE_PARM_DESC(fcnt, "Num of frames per sub-buffer for sync channels as a powe
static DEFINE_SPINLOCK(dim_lock);
static void dim2_tasklet_fn(unsigned long data);
static DECLARE_TASKLET(dim2_tasklet, dim2_tasklet_fn, 0);
static DECLARE_TASKLET_OLD(dim2_tasklet, dim2_tasklet_fn);
/**
* struct hdm_channel - private structure to keep channel specific data

2
drivers/staging/octeon/ethernet-tx.c
View File

@ -41,7 +41,7 @@
#endif
static void cvm_oct_tx_do_cleanup(unsigned long arg);
static DECLARE_TASKLET(cvm_oct_tx_cleanup_tasklet, cvm_oct_tx_do_cleanup, 0);
static DECLARE_TASKLET_OLD(cvm_oct_tx_cleanup_tasklet, cvm_oct_tx_do_cleanup);
/* Maximum number of SKBs to try to free per xmit packet. */
#define MAX_SKB_TO_FREE (MAX_OUT_QUEUE_DEPTH * 2)

2
drivers/tty/vt/keyboard.c
View File

@ -1236,7 +1236,7 @@ static void kbd_bh(unsigned long dummy)
}
}
DECLARE_TASKLET_DISABLED(keyboard_tasklet, kbd_bh, 0);
DECLARE_TASKLET_DISABLED_OLD(keyboard_tasklet, kbd_bh);
#if defined(CONFIG_X86) || defined(CONFIG_IA64) || defined(CONFIG_ALPHA) ||\
defined(CONFIG_MIPS) || defined(CONFIG_PPC) || defined(CONFIG_SPARC) ||\

6
drivers/usb/gadget/udc/snps_udc_core.c
View File

@ -96,9 +96,7 @@ static int stop_pollstall_timer;
static DECLARE_COMPLETION(on_pollstall_exit);
/* tasklet for usb disconnect */
static DECLARE_TASKLET(disconnect_tasklet, udc_tasklet_disconnect,
(unsigned long) &udc);
static DECLARE_TASKLET_OLD(disconnect_tasklet, udc_tasklet_disconnect);
/* endpoint names used for print */
static const char ep0_string[] = "ep0in";
@ -1661,7 +1659,7 @@ static void usb_disconnect(struct udc *dev)
/* Tasklet for disconnect to be outside of interrupt context */
static void udc_tasklet_disconnect(unsigned long par)
{
struct udc *dev = (struct udc *)(*((struct udc **) par));
struct udc *dev = udc;
u32 tmp;
DBG(dev, "Tasklet disconnect\n");

2
drivers/usb/host/fhci-sched.c
View File

@ -677,7 +677,7 @@ static void process_done_list(unsigned long data)
enable_irq(fhci_to_hcd(fhci)->irq);
}
DECLARE_TASKLET(fhci_tasklet, process_done_list, 0);
DECLARE_TASKLET_OLD(fhci_tasklet, process_done_list);
/* transfer complted callback */
u32 fhci_transfer_confirm_callback(struct fhci_hcd *fhci)

41
include/linux/interrupt.h
View File

@ -585,6 +585,9 @@ static inline struct task_struct *this_cpu_ksoftirqd(void)
/* Tasklets --- multithreaded analogue of BHs.
This API is deprecated. Please consider using threaded IRQs instead:
https://lore.kernel.org/lkml/20200716081538.2sivhkj4hcyrusem@linutronix.de
Main feature differing them of generic softirqs: tasklet
is running only on one CPU simultaneously.
@ -608,16 +611,42 @@ struct tasklet_struct
struct tasklet_struct *next;
unsigned long state;
atomic_t count;
void (*func)(unsigned long);
bool use_callback;
union {
void (*func)(unsigned long data);
void (*callback)(struct tasklet_struct *t);
};
unsigned long data;
};
#define DECLARE_TASKLET(name, func, data) \
struct tasklet_struct name = { NULL, 0, ATOMIC_INIT(0), func, data }
#define DECLARE_TASKLET(name, _callback) \
struct tasklet_struct name = { \
.count = ATOMIC_INIT(0), \
.callback = _callback, \
.use_callback = true, \
}
#define DECLARE_TASKLET_DISABLED(name, func, data) \
struct tasklet_struct name = { NULL, 0, ATOMIC_INIT(1), func, data }
#define DECLARE_TASKLET_DISABLED(name, _callback) \
struct tasklet_struct name = { \
.count = ATOMIC_INIT(1), \
.callback = _callback, \
.use_callback = true, \
}
#define from_tasklet(var, callback_tasklet, tasklet_fieldname) \
container_of(callback_tasklet, typeof(*var), tasklet_fieldname)
#define DECLARE_TASKLET_OLD(name, _func) \
struct tasklet_struct name = { \
.count = ATOMIC_INIT(0), \
.func = _func, \
}
#define DECLARE_TASKLET_DISABLED_OLD(name, _func) \
struct tasklet_struct name = { \
.count = ATOMIC_INIT(1), \
.func = _func, \
}
enum
{
@ -686,6 +715,8 @@ extern void tasklet_kill(struct tasklet_struct *t);
extern void tasklet_kill_immediate(struct tasklet_struct *t, unsigned int cpu);
extern void tasklet_init(struct tasklet_struct *t,
void (*func)(unsigned long), unsigned long data);
extern void tasklet_setup(struct tasklet_struct *t,
void (*callback)(struct tasklet_struct *));
/*
* Autoprobing for irqs:

2
kernel/backtracetest.c
View File

@ -29,7 +29,7 @@ static void backtrace_test_irq_callback(unsigned long data)
complete(&backtrace_work);
}
static DECLARE_TASKLET(backtrace_tasklet, &backtrace_test_irq_callback, 0);
static DECLARE_TASKLET_OLD(backtrace_tasklet, &backtrace_test_irq_callback);
static void backtrace_test_irq(void)
{

2
kernel/debug/debug_core.c
View File

@ -1068,7 +1068,7 @@ static void kgdb_tasklet_bpt(unsigned long ing)
atomic_set(&kgdb_break_tasklet_var, 0);
}
static DECLARE_TASKLET(kgdb_tasklet_breakpoint, kgdb_tasklet_bpt, 0);
static DECLARE_TASKLET_OLD(kgdb_tasklet_breakpoint, kgdb_tasklet_bpt);
void kgdb_schedule_breakpoint(void)
{

2
kernel/irq/resend.c
View File

@ -45,7 +45,7 @@ static void resend_irqs(unsigned long arg)
}
/* Tasklet to handle resend: */
static DECLARE_TASKLET(resend_tasklet, resend_irqs, 0);
static DECLARE_TASKLET_OLD(resend_tasklet, resend_irqs);
static int irq_sw_resend(struct irq_desc *desc)
{

18
kernel/softirq.c
View File

@ -553,7 +553,10 @@ static void tasklet_action_common(struct softirq_action *a,
if (!test_and_clear_bit(TASKLET_STATE_SCHED,
&t->state))
BUG();
t->func(t->data);
if (t->use_callback)
t->callback(t);
else
t->func(t->data);
tasklet_unlock(t);
continue;
}
@ -579,6 +582,18 @@ static __latent_entropy void tasklet_hi_action(struct softirq_action *a)
tasklet_action_common(a, this_cpu_ptr(&tasklet_hi_vec), HI_SOFTIRQ);
}
void tasklet_setup(struct tasklet_struct *t,
void (*callback)(struct tasklet_struct *))
{
t->next = NULL;
t->state = 0;
atomic_set(&t->count, 0);
t->callback = callback;
t->use_callback = true;
t->data = 0;
}
EXPORT_SYMBOL(tasklet_setup);
void tasklet_init(struct tasklet_struct *t,
void (*func)(unsigned long), unsigned long data)
{
@ -586,6 +601,7 @@ void tasklet_init(struct tasklet_struct *t,
t->state = 0;
atomic_set(&t->count, 0);
t->func = func;
t->use_callback = false;
t->data = data;
}
EXPORT_SYMBOL(tasklet_init);

2
net/atm/pppoatm.c
View File

@ -393,7 +393,7 @@ static int pppoatm_assign_vcc(struct atm_vcc *atmvcc, void __user *arg)
* Each PPPoATM instance has its own tasklet - this is just a
* prototypical one used to initialize them
*/
static const DECLARE_TASKLET(tasklet_proto, pppoatm_wakeup_sender, 0);
static const DECLARE_TASKLET_OLD(tasklet_proto, pppoatm_wakeup_sender);
if (copy_from_user(&be, arg, sizeof be))
return -EFAULT;
if (be.encaps != PPPOATM_ENCAPS_AUTODETECT &&

2
net/iucv/iucv.c
View File

@ -105,7 +105,7 @@ static LIST_HEAD(iucv_task_queue);
* The tasklet for fast delivery of iucv interrupts.
*/
static void iucv_tasklet_fn(unsigned long);
static DECLARE_TASKLET(iucv_tasklet, iucv_tasklet_fn,0);
static DECLARE_TASKLET_OLD(iucv_tasklet, iucv_tasklet_fn);
/*
* Queue of interrupt buffers for delivery via a work queue

2
sound/drivers/pcsp/pcsp_lib.c
View File

@ -36,7 +36,7 @@ static void pcsp_call_pcm_elapsed(unsigned long priv)
}
}
static DECLARE_TASKLET(pcsp_pcm_tasklet, pcsp_call_pcm_elapsed, 0);
static DECLARE_TASKLET_OLD(pcsp_pcm_tasklet, pcsp_call_pcm_elapsed);
/* write the port and returns the next expire time in ns;
* called at the trigger-start and in hrtimer callback