#include #include void __init_swait_queue_head(struct swait_queue_head *q, const char *name, struct lock_class_key *key) { raw_spin_lock_init(&q->lock); lockdep_set_class_and_name(&q->lock, key, name); INIT_LIST_HEAD(&q->task_list); } EXPORT_SYMBOL(__init_swait_queue_head); /* * The thing about the wake_up_state() return value; I think we can ignore it. * * If for some reason it would return 0, that means the previously waiting * task is already running, so it will observe condition true (or has already). */ void swake_up_locked(struct swait_queue_head *q) { struct swait_queue *curr; if (list_empty(&q->task_list)) return; curr = list_first_entry(&q->task_list, typeof(*curr), task_list); wake_up_process(curr->task); list_del_init(&curr->task_list); } EXPORT_SYMBOL(swake_up_locked); void swake_up(struct swait_queue_head *q) { unsigned long flags; if (!swait_active(q)) return; raw_spin_lock_irqsave(&q->lock, flags); swake_up_locked(q); raw_spin_unlock_irqrestore(&q->lock, flags); } EXPORT_SYMBOL(swake_up); /* * Does not allow usage from IRQ disabled, since we must be able to * release IRQs to guarantee bounded hold time. */ void swake_up_all(struct swait_queue_head *q) { struct swait_queue *curr; LIST_HEAD(tmp); if (!swait_active(q)) return; raw_spin_lock_irq(&q->lock); list_splice_init(&q->task_list, &tmp); while (!list_empty(&tmp)) { curr = list_first_entry(&tmp, typeof(*curr), task_list); wake_up_state(curr->task, TASK_NORMAL); list_del_init(&curr->task_list); if (list_empty(&tmp)) break; raw_spin_unlock_irq(&q->lock); raw_spin_lock_irq(&q->lock); } raw_spin_unlock_irq(&q->lock); } EXPORT_SYMBOL(swake_up_all); void __prepare_to_swait(struct swait_queue_head *q, struct swait_queue *wait) { wait->task = current; if (list_empty(&wait->task_list)) list_add(&wait->task_list, &q->task_list); } void prepare_to_swait(struct swait_queue_head *q, struct swait_queue *wait, int state) { unsigned long flags; raw_spin_lock_irqsave(&q->lock, flags); __prepare_to_swait(q, wait); set_current_state(state); raw_spin_unlock_irqrestore(&q->lock, flags); } EXPORT_SYMBOL(prepare_to_swait); long prepare_to_swait_event(struct swait_queue_head *q, struct swait_queue *wait, int state) { if (signal_pending_state(state, current)) return -ERESTARTSYS; prepare_to_swait(q, wait, state); return 0; } EXPORT_SYMBOL(prepare_to_swait_event); void __finish_swait(struct swait_queue_head *q, struct swait_queue *wait) { __set_current_state(TASK_RUNNING); if (!list_empty(&wait->task_list)) list_del_init(&wait->task_list); } void finish_swait(struct swait_queue_head *q, struct swait_queue *wait) { unsigned long flags; __set_current_state(TASK_RUNNING); if (!list_empty_careful(&wait->task_list)) { raw_spin_lock_irqsave(&q->lock, flags); list_del_init(&wait->task_list); raw_spin_unlock_irqrestore(&q->lock, flags); } } EXPORT_SYMBOL(finish_swait); nclude/crypto?id=d7df2443cd5f67fc6ee7c05a88e4996e8177f91b'>crypto/scatterwalk.h
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authorBenjamin Herrenschmidt <benh@kernel.crashing.org>2017-02-03 17:10:28 +1100
committerMichael Ellerman <mpe@ellerman.id.au>2017-02-08 23:36:29 +1100
commitd7df2443cd5f67fc6ee7c05a88e4996e8177f91b (patch)
tree098a7c0ca4fceb8a65cb1f693c9d71990388933d /include/crypto/scatterwalk.h
parenta0615a16f7d0ceb5804d295203c302d496d8ee91 (diff)
powerpc/mm: Fix spurrious segfaults on radix with autonuma
When autonuma (Automatic NUMA balancing) marks a PTE inaccessible it clears all the protection bits but leave the PTE valid. With the Radix MMU, an attempt at executing from such a PTE will take a fault with bit 35 of SRR1 set "SRR1_ISI_N_OR_G". It is thus incorrect to treat all such faults as errors. We should pass them to handle_mm_fault() for autonuma to deal with. The case of pages that are really not executable is handled by the existing test for VM_EXEC further down. That leaves us with catching the kernel attempts at executing user pages. We can catch that earlier, even before we do find_vma. It is never valid on powerpc for the kernel to take an exec fault to begin with. So fold that test with the existing test for the kernel faulting on kernel addresses to bail out early. Fixes: 1d18ad026844 ("powerpc/mm: Detect instruction fetch denied and report") Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Reviewed-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Acked-by: Balbir Singh <bsingharora@gmail.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'include/crypto/scatterwalk.h')