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Synchronize access to a vm page's valid field using the containing

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vm object's lock.
This commit is contained in:
Alan Cox 2003-10-04 19:13:27 +00:00
parent 829340b175
commit 49c06616ae
1 changed files with 4 additions and 4 deletions
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8
sys/vm/vm_kern.c
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@ -196,21 +196,21 @@ kmem_alloc(map, size)
* We're intentionally not activating the pages we allocate to prevent a
* race with page-out. vm_map_pageable will wire the pages.
*/
VM_OBJECT_LOCK(kernel_object);
for (i = 0; i < size; i += PAGE_SIZE) {
vm_page_t mem;
VM_OBJECT_LOCK(kernel_object);
mem = vm_page_grab(kernel_object, OFF_TO_IDX(offset + i),
VM_ALLOC_ZERO | VM_ALLOC_RETRY);
VM_OBJECT_UNLOCK(kernel_object);
if ((mem->flags & PG_ZERO) == 0)
pmap_zero_page(mem);
vm_page_lock_queues();
mem->valid = VM_PAGE_BITS_ALL;
vm_page_lock_queues();
vm_page_flag_clear(mem, PG_ZERO);
vm_page_wakeup(mem);
vm_page_unlock_queues();
}
VM_OBJECT_UNLOCK(kernel_object);
/*
* And finally, mark the data as non-pageable.
@ -406,9 +406,9 @@ retry:
}
if (flags & M_ZERO && (m->flags & PG_ZERO) == 0)
pmap_zero_page(m);
m->valid = VM_PAGE_BITS_ALL;
vm_page_lock_queues();
vm_page_flag_clear(m, PG_ZERO);
m->valid = VM_PAGE_BITS_ALL;
vm_page_unmanage(m);
vm_page_unlock_queues();
}