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From: "Tobin C. Harding" <me@tobin.cc>
To: kernelnewbies@kernelnewbies.org
Subject: Where is PageHead defined in v5.0?
Date: Thu, 28 Mar 2019 09:26:15 +1100	[thread overview]
Message-ID: <20190327222615.GB5006@eros.localdomain> (raw)

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.

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             reply	other threads:[~2019-03-27 22:27 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-03-27 22:26 Tobin C. Harding [this message]
2019-03-28  0:34 ` Where is PageHead defined in v5.0? Jesse Simpson
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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