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alpha: take SIGPENDING/NOTIFY_RESUME loop into signal.c 

Turn the slow side of work_pending into C function, including all
the looping.  What we get out of that:
	* we do _not_ call get_signal_to_deliver() with IRQs disabled
anymore
	* no need to save/restore volatiles on each pass if there
turns to be more than one (unlikely, but still)
	* all double-restart prevention is in C now.
	* glue gets simpler.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2012-09-05 18:30:34 -04:00
parent 7721d3c208
commit 6972d6f25d
2 changed files with 20 additions and 17 deletions
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10
arch/alpha/kernel/entry.S
View File

@ -390,15 +390,9 @@ $work_notifysig:
bsr $1, do_switch_stack
mov $sp, $17
mov $5, $18
mov $19, $9 /* save old syscall number */
mov $20, $10 /* save old a3 */
and $5, _TIF_SIGPENDING, $2
cmovne $2, 0, $9 /* we don't want double syscall restarts */
jsr $26, do_notify_resume
mov $9, $19
mov $10, $20
jsr $26, do_work_pending
bsr $1, undo_switch_stack
br ret_to_user
br restore_all
.end work_pending
/*

19
arch/alpha/kernel/signal.c
View File

@ -568,15 +568,24 @@ do_signal(struct pt_regs * regs, struct switch_stack * sw,
}
void
do_notify_resume(struct pt_regs *regs, struct switch_stack *sw,
unsigned long thread_info_flags,
do_work_pending(struct pt_regs *regs, struct switch_stack *sw,
unsigned long thread_flags,
unsigned long r0, unsigned long r19)
{
if (thread_info_flags & _TIF_SIGPENDING)
do {
if (thread_flags & _TIF_NEED_RESCHED) {
schedule();
} else {
local_irq_enable();
if (thread_flags & _TIF_SIGPENDING) {
do_signal(regs, sw, r0, r19);
if (thread_info_flags & _TIF_NOTIFY_RESUME) {
r0 = 0;
} else {
clear_thread_flag(TIF_NOTIFY_RESUME);
tracehook_notify_resume(regs);
}
}
local_irq_disable();
thread_flags = current_thread_info()->flags;
} while (thread_flags & _TIF_WORK_MASK);
}