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keep page.count valid through its life cycle

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NAKAMURA Gou
2014-05-07 18:34:15 +09:00
parent 29c7d40005
commit ce7af5839d
4 changed files with 16 additions and 6 deletions
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12
kernel/mem.c
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@@ -97,7 +97,7 @@ void free_pages(void *va, int npages)
}
if (pendings->next != NULL) {
page->mode = PM_PENDING_FREE;
page->count = npages;
page->offset = npages;
list_add_tail(&page->list, pendings);
return;
}
@@ -131,7 +131,7 @@ void finish_free_pages_pending(void)
}
page->mode = PM_NONE;
list_del(&page->list);
ihk_pagealloc_free(pa_allocator, page_to_phys(page), page->count);
ihk_pagealloc_free(pa_allocator, page_to_phys(page), page->offset);
}
pendings->next = pendings->prev = NULL;
@@ -339,10 +339,6 @@ uintptr_t page_to_phys(struct page *page)
int page_unmap(struct page *page)
{
dkprintf("page_unmap(%p %x %d)\n", page, page->mode, page->count);
if (page->mode != PM_MAPPED) {
return 1;
}
if (ihk_atomic_sub_return(1, &page->count) > 0) {
/* other mapping exist */
dkprintf("page_unmap(%p %x %d): 0\n",
@@ -351,6 +347,10 @@ int page_unmap(struct page *page)
}
/* no mapping exist */
if (page->mode != PM_MAPPED) {
return 1;
}
list_del(&page->list);
page->mode = PM_NONE;
dkprintf("page_unmap(%p %x %d): 1\n", page, page->mode, page->count);