# \[PATCH 3/6\] struct page: add field for vm\_struct

- From: Kees Cook \<hidden\>
- Date: 2018-02-01 21:11:15 
- List: linux-security-module
- Page: https://ratatoskr.run/linux-security-module/2018/02/5199666
- Thread: https://ratatoskr.run/linux-security-module/2018/01/5183216/t.md

```text
On Thu, Feb 1, 2018 at 11:42 PM, Igor Stoppa [ref] wrote:
> On 01/02/18 02:00, Christopher Lameter wrote:
>> Would it not be better to use compound page allocations here?
>> page_head(whatever) gets you the head page where you can store all sorts
>> of information about the chunk of memory.
>
> Can you please point me to this function/macro? I don't seem to be able
> to find it, at least not in 4.15

IIUC, he means PageHead(), which is also hard to grep for, since it is
a constructed name, via Page##uname in include/linux/page-flags.h:

__PAGEFLAG(Head, head, PF_ANY) CLEARPAGEFLAG(Head, head, PF_ANY)

-Kees

-- 
Kees Cook
Pixel Security
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