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Linux 5.2

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Merge 5.2 into android-common

Linux 5.2

Signed-off-by: Greg Kroah-Hartman <[email protected]>
This commit is contained in:
Greg Kroah-Hartman 2019-07-08 08:24:40 +02:00
commit a4bbf3df04
81 changed files with 492 additions and 313 deletions
Download patch file Download diff file Expand all files Collapse all files

42
fs/userfaultfd.c
View file

@ -40,6 +40,16 @@ enum userfaultfd_state {
/*
* Start with fault_pending_wqh and fault_wqh so they're more likely
* to be in the same cacheline.
*
* Locking order:
* fd_wqh.lock
* fault_pending_wqh.lock
* fault_wqh.lock
* event_wqh.lock
*
* To avoid deadlocks, IRQs must be disabled when taking any of the above locks,
* since fd_wqh.lock is taken by aio_poll() while it's holding a lock that's
* also taken in IRQ context.
*/
struct userfaultfd_ctx {
/* waitqueue head for the pending (i.e. not read) userfaults */
@ -458,7 +468,7 @@ vm_fault_t handle_userfault(struct vm_fault *vmf, unsigned long reason)
blocking_state = return_to_userland ? TASK_INTERRUPTIBLE :
TASK_KILLABLE;
spin_lock(&ctx->fault_pending_wqh.lock);
spin_lock_irq(&ctx->fault_pending_wqh.lock);
/*
* After the __add_wait_queue the uwq is visible to userland
* through poll/read().
@ -470,7 +480,7 @@ vm_fault_t handle_userfault(struct vm_fault *vmf, unsigned long reason)
* __add_wait_queue.
*/
set_current_state(blocking_state);
spin_unlock(&ctx->fault_pending_wqh.lock);
spin_unlock_irq(&ctx->fault_pending_wqh.lock);
if (!is_vm_hugetlb_page(vmf->vma))
must_wait = userfaultfd_must_wait(ctx, vmf->address, vmf->flags,
@ -552,13 +562,13 @@ vm_fault_t handle_userfault(struct vm_fault *vmf, unsigned long reason)
* kernel stack can be released after the list_del_init.
*/
if (!list_empty_careful(&uwq.wq.entry)) {
spin_lock(&ctx->fault_pending_wqh.lock);
spin_lock_irq(&ctx->fault_pending_wqh.lock);
/*
* No need of list_del_init(), the uwq on the stack
* will be freed shortly anyway.
*/
list_del(&uwq.wq.entry);
spin_unlock(&ctx->fault_pending_wqh.lock);
spin_unlock_irq(&ctx->fault_pending_wqh.lock);
}
/*
@ -583,7 +593,7 @@ static void userfaultfd_event_wait_completion(struct userfaultfd_ctx *ctx,
init_waitqueue_entry(&ewq->wq, current);
release_new_ctx = NULL;
spin_lock(&ctx->event_wqh.lock);
spin_lock_irq(&ctx->event_wqh.lock);
/*
* After the __add_wait_queue the uwq is visible to userland
* through poll/read().
@ -613,15 +623,15 @@ static void userfaultfd_event_wait_completion(struct userfaultfd_ctx *ctx,
break;
}
spin_unlock(&ctx->event_wqh.lock);
spin_unlock_irq(&ctx->event_wqh.lock);
wake_up_poll(&ctx->fd_wqh, EPOLLIN);
schedule();
spin_lock(&ctx->event_wqh.lock);
spin_lock_irq(&ctx->event_wqh.lock);
}
__set_current_state(TASK_RUNNING);
spin_unlock(&ctx->event_wqh.lock);
spin_unlock_irq(&ctx->event_wqh.lock);
if (release_new_ctx) {
struct vm_area_struct *vma;
@ -919,10 +929,10 @@ wakeup:
* the last page faults that may have been already waiting on
* the fault_*wqh.
*/
spin_lock(&ctx->fault_pending_wqh.lock);
spin_lock_irq(&ctx->fault_pending_wqh.lock);
__wake_up_locked_key(&ctx->fault_pending_wqh, TASK_NORMAL, &range);
__wake_up(&ctx->fault_wqh, TASK_NORMAL, 1, &range);
spin_unlock(&ctx->fault_pending_wqh.lock);
spin_unlock_irq(&ctx->fault_pending_wqh.lock);
/* Flush pending events that may still wait on event_wqh */
wake_up_all(&ctx->event_wqh);
@ -1135,7 +1145,7 @@ static ssize_t userfaultfd_ctx_read(struct userfaultfd_ctx *ctx, int no_wait,
if (!ret && msg->event == UFFD_EVENT_FORK) {
ret = resolve_userfault_fork(ctx, fork_nctx, msg);
spin_lock(&ctx->event_wqh.lock);
spin_lock_irq(&ctx->event_wqh.lock);
if (!list_empty(&fork_event)) {
/*
* The fork thread didn't abort, so we can
@ -1181,7 +1191,7 @@ static ssize_t userfaultfd_ctx_read(struct userfaultfd_ctx *ctx, int no_wait,
if (ret)
userfaultfd_ctx_put(fork_nctx);
}
spin_unlock(&ctx->event_wqh.lock);
spin_unlock_irq(&ctx->event_wqh.lock);
}
return ret;
@ -1220,14 +1230,14 @@ static ssize_t userfaultfd_read(struct file *file, char __user *buf,
static void __wake_userfault(struct userfaultfd_ctx *ctx,
struct userfaultfd_wake_range *range)
{
spin_lock(&ctx->fault_pending_wqh.lock);
spin_lock_irq(&ctx->fault_pending_wqh.lock);
/* wake all in the range and autoremove */
if (waitqueue_active(&ctx->fault_pending_wqh))
__wake_up_locked_key(&ctx->fault_pending_wqh, TASK_NORMAL,
range);
if (waitqueue_active(&ctx->fault_wqh))
__wake_up(&ctx->fault_wqh, TASK_NORMAL, 1, range);
spin_unlock(&ctx->fault_pending_wqh.lock);
spin_unlock_irq(&ctx->fault_pending_wqh.lock);
}
static __always_inline void wake_userfault(struct userfaultfd_ctx *ctx,
@ -1884,7 +1894,7 @@ static void userfaultfd_show_fdinfo(struct seq_file *m, struct file *f)
wait_queue_entry_t *wq;
unsigned long pending = 0, total = 0;
spin_lock(&ctx->fault_pending_wqh.lock);
spin_lock_irq(&ctx->fault_pending_wqh.lock);
list_for_each_entry(wq, &ctx->fault_pending_wqh.head, entry) {
pending++;
total++;
@ -1892,7 +1902,7 @@ static void userfaultfd_show_fdinfo(struct seq_file *m, struct file *f)
list_for_each_entry(wq, &ctx->fault_wqh.head, entry) {
total++;
}
spin_unlock(&ctx->fault_pending_wqh.lock);
spin_unlock_irq(&ctx->fault_pending_wqh.lock);
/*
* If more protocols will be added, there will be all shown