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signal: turn dequeue_signal_lock() into kernel_dequeue_signal()

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1. Rename dequeue_signal_lock() to kernel_dequeue_signal(). This
   matches another "for kthreads only" kernel_sigaction() helper.

2. Remove the "tsk" and "mask" arguments, they are always current
   and current->blocked. And it is simply wrong if tsk != current.

3. We could also remove the 3rd "siginfo_t *info" arg but it looks
   potentially useful. However we can simplify the callers if we
   change kernel_dequeue_signal() to accept info => NULL.

4. Remove _irqsave, it is never called from atomic context.

Signed-off-by: Oleg Nesterov <[email protected]>
Reviewed-by: Tejun Heo <[email protected]>
Cc: David Woodhouse <[email protected]>
Cc: Felipe Balbi <[email protected]>
Cc: Markus Pargmann <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Oleg Nesterov 2015-11-06 16:32:22 -08:00 • committed by Linus Torvalds
commit be0e6f290f
4 changed files with 12 additions and 21 deletions
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4
drivers/usb/gadget/function/f_mass_storage.c
View file

@ -2345,7 +2345,6 @@ static void fsg_disable(struct usb_function *f)
static void handle_exception(struct fsg_common *common)
{
siginfo_t info;
int i;
struct fsg_buffhd *bh;
enum fsg_state old_state;
@ -2357,8 +2356,7 @@ static void handle_exception(struct fsg_common *common)
* into a high-priority EXIT exception.
*/
for (;;) {
int sig =
dequeue_signal_lock(current, &current->blocked, &info);
int sig = kernel_dequeue_signal(NULL);
if (!sig)
break;
if (sig != SIGUSR1) {