From: Jesse Simpson <jesse.simpson36@gmail.com>
To: "Tobin C. Harding" <me@tobin.cc>
Cc: kernelnewbies@kernelnewbies.org
Subject: Re: Where is PageHead defined in v5.0?
Date: Wed, 27 Mar 2019 19:34:58 -0500 [thread overview]
Message-ID: <20190328003458.GA1733@koro.localdomain> (raw)
In-Reply-To: <20190327222615.GB5006@eros.localdomain>
Hi Tobin,
I took a look on my system, and I wasn't able to find where PageHead is
defined either. I used grep to search for it as well as vim with ctags.
Maybe it's hidden away in some built-in.a or binary file.
I'm looking on version 5.0.0.
Good luck,
Jesse Simpson
On Thu, Mar 28, 2019 at 09:26:15AM +1100, Tobin C. Harding wrote:
> Hi,
>
> I cannot locate the definition of PageHead? It seems to have
> disappeared after v4.0? I can see it defined as a function here:
>
> https://elixir.bootlin.com/linux/v4.0/source/include/linux/page-flags.h#L401
>
> But on the mainline (v5.1-rc2) I get:
>
> $ git grep ' PageHead'
> include/linux/page-flags.h:int PageHeadHuge(struct page *page);
> include/linux/page-flags.h: return PageHead(page);
> include/linux/page-flags.h: return PageHead(page) && test_bit(PG_double_map, &page[1].flags);
> mm/hugetlb.c: return PageHead(page) && PagePrivate(&page[1]);
> mm/hugetlb.c: * PageHeadHuge() only returns true for hugetlbfs head page, but not for
> mm/hugetlb.c:int PageHeadHuge(struct page *page_head)
>
> Clearly it is defined _somewhere_. Anyone any idea what brain
> dysfunction I am having right now?
>
> thanks,
> Tobin.
>
> _______________________________________________
> Kernelnewbies mailing list
> Kernelnewbies@kernelnewbies.org
> https://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
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next prev parent reply other threads:[~2019-03-27 23:37 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-03-27 22:26 Where is PageHead defined in v5.0? Tobin C. Harding
2019-03-28 0:34 ` Jesse Simpson [this message]
2019-03-27 23:49 ` Tobin C. Harding
2019-03-28 0:23 ` Igor Pylypiv
2019-03-28 4:43 ` Tobin C. Harding
2019-03-28 5:50 ` Valdis Klētnieks
2019-03-28 20:49 ` Jesse Simpson
2019-03-28 20:56 ` Tobin C. Harding
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