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use atomic operations for manipulating page.count

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NAKAMURA Gou
2014-05-07 18:16:13 +09:00
parent 604d1da50f
commit 29c7d40005
3 changed files with 20 additions and 10 deletions
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5
kernel/mem.c
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@ -343,7 +343,7 @@ int page_unmap(struct page *page)
return 1;
}
if (--page->count > 0) {
if (ihk_atomic_sub_return(1, &page->count) > 0) {
/* other mapping exist */
dkprintf("page_unmap(%p %x %d): 0\n",
page, page->mode, page->count);
@ -363,6 +363,9 @@ static void page_init(void)
size_t allocsize;
size_t allocpages;
if (sizeof(ihk_atomic_t) != sizeof(uint32_t)) {
panic("sizeof(ihk_atomic_t) is not 32 bit");
}
npages = (pa_end - pa_start) >> PAGE_SHIFT;
allocsize = sizeof(struct page) * npages;
allocpages = (allocsize + PAGE_SIZE - 1) >> PAGE_SHIFT;