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Hi all,
Simple question regarding __get_free_pages and (struct page*)->count. Why
does only the first page returned by __get_free_pages have it's count set to
1 and all other pages have their count set to 0?
Example:
#define ORDER 2
unsigned long p, offset=0;
struct page *page;
if(!(p=__get_free_pages(SLAB_KERNEL, ORDER))) {
goto err;
}
while(offset < PAGE_SIZE<<ORDER) {
page=virt_to_page(p+offset);
SC_DEBUG(" offset: %lu, page_count is %d", offset, page_count(page));
offset+=PAGE_SIZE;
}
Resulting output is:
Dec 18 15:36:14 meteor kernel: sc: offset: 0, page_count is 1
Dec 18 15:36:14 meteor kernel: sc: offset: 4096, page_count is 0
Dec 18 15:36:14 meteor kernel: sc: offset: 8192, page_count is 0
Dec 18 15:36:14 meteor kernel: sc: offset: 12288, page_count is 0
Thanks,
Olivier
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Olivier Daigle <odaigle@harfangmicro.com>
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This archive was generated by hypermail 2b29 : Sun Dec 23 2001 - 21:00:18 EST