do_exception(regs, error_code & 0xff, 0);
}
-#ifndef CONFIG_ARCH_S390X
-
-typedef struct _pseudo_wait_t {
- struct _pseudo_wait_t *next;
- wait_queue_head_t queue;
- unsigned long address;
- int resolved;
-} pseudo_wait_t;
-
-static pseudo_wait_t *pseudo_lock_queue = NULL;
-static spinlock_t pseudo_wait_spinlock; /* spinlock to protect lock queue */
-
-/*
- * This routine handles 'pagex' pseudo page faults.
- */
-asmlinkage void
-do_pseudo_page_fault(struct pt_regs *regs, unsigned long error_code)
-{
- pseudo_wait_t wait_struct;
- pseudo_wait_t *ptr, *last, *next;
- unsigned long address;
-
- /*
- * get the failing address
- * more specific the segment and page table portion of
- * the address
- */
- address = S390_lowcore.trans_exc_code & 0xfffff000;
-
- if (address & 0x80000000) {
- /* high bit set -> a page has been swapped in by VM */
- address &= 0x7fffffff;
- spin_lock(&pseudo_wait_spinlock);
- last = NULL;
- ptr = pseudo_lock_queue;
- while (ptr != NULL) {
- next = ptr->next;
- if (address == ptr->address) {
- /*
- * This is one of the processes waiting
- * for the page. Unchain from the queue.
- * There can be more than one process
- * waiting for the same page. VM presents
- * an initial and a completion interrupt for
- * every process that tries to access a
- * page swapped out by VM.
- */
- if (last == NULL)
- pseudo_lock_queue = next;
- else
- last->next = next;
- /* now wake up the process */
- ptr->resolved = 1;
- wake_up(&ptr->queue);
- } else
- last = ptr;
- ptr = next;
- }
- spin_unlock(&pseudo_wait_spinlock);
- } else {
- /* Pseudo page faults in kernel mode is a bad idea */
- if (!(regs->psw.mask & PSW_MASK_PSTATE)) {
- /*
- * VM presents pseudo page faults if the interrupted
- * state was not disabled for interrupts. So we can
- * get pseudo page fault interrupts while running
- * in kernel mode. We simply access the page here
- * while we are running disabled. VM will then swap
- * in the page synchronously.
- */
- if (check_user_space(regs, error_code) == 0)
- /* dereference a virtual kernel address */
- __asm__ __volatile__ (
- " ic 0,0(%0)"
- : : "a" (address) : "0");
- else
- /* dereference a virtual user address */
- __asm__ __volatile__ (
- " la 2,0(%0)\n"
- " sacf 512\n"
- " ic 2,0(2)\n"
- "0:sacf 0\n"
- ".section __ex_table,\"a\"\n"
- " .align 4\n"
- " .long 0b,0b\n"
- ".previous"
- : : "a" (address) : "2" );
-
- return;
- }
- /* initialize and add element to pseudo_lock_queue */
- init_waitqueue_head (&wait_struct.queue);
- wait_struct.address = address;
- wait_struct.resolved = 0;
- spin_lock(&pseudo_wait_spinlock);
- wait_struct.next = pseudo_lock_queue;
- pseudo_lock_queue = &wait_struct;
- spin_unlock(&pseudo_wait_spinlock);
- /*
- * The instruction that caused the program check will
- * be repeated. Don't signal single step via SIGTRAP.
- */
- clear_tsk_thread_flag(current, TIF_SINGLE_STEP);
- /* go to sleep */
- wait_event(wait_struct.queue, wait_struct.resolved);
- }
-}
-#endif /* CONFIG_ARCH_S390X */
-
#ifdef CONFIG_PFAULT
/*
* 'pfault' pseudo page faults routines.
" .quad 0b,1b\n"
#endif /* CONFIG_ARCH_S390X */
".previous"
- : "=d" (rc) : "a" (&refbk) : "cc" );
+ : "=d" (rc) : "a" (&refbk), "m" (refbk) : "cc" );
__ctl_set_bit(0, 9);
return rc;
}
" .quad 0b,0b\n"
#endif /* CONFIG_ARCH_S390X */
".previous"
- : : "a" (&refbk) : "cc" );
+ : : "a" (&refbk), "m" (refbk) : "cc" );
}
asmlinkage void
* interrupt. pfault_wait is valid. Set pfault_wait
* back to zero and wake up the process. This can
* safely be done because the task is still sleeping
- * and can't procude new pfaults. */
+ * and can't produce new pfaults. */
tsk->thread.pfault_wait = 0;
wake_up_process(tsk);
+ put_task_struct(tsk);
}
} else {
/* signal bit not set -> a real page is missing. */
+ get_task_struct(tsk);
set_task_state(tsk, TASK_UNINTERRUPTIBLE);
if (xchg(&tsk->thread.pfault_wait, 1) != 0) {
/* Completion interrupt was faster than the initial
* mode and can't produce new pfaults. */
tsk->thread.pfault_wait = 0;
set_task_state(tsk, TASK_RUNNING);
+ put_task_struct(tsk);
} else
set_tsk_need_resched(tsk);
}
projects / linux-2.6-omap-h63xx.git / blobdiff