linuxkpi: Add `folio` and `folio_batch` APIs

They are used by the i915 DRM driver in Linux 6.6 (although this change
was only backported with Linux 6.7 DRM drivers).

`struct folio` simply wraps `st

linuxkpi: Add `folio` and `folio_batch` APIs

They are used by the i915 DRM driver in Linux 6.6 (although this change
was only backported with Linux 6.7 DRM drivers).

`struct folio` simply wraps `struct page` for now.

`struct folio_batch` is the same as `struct pagevec` but it works with
`struct folio` instead of `struct page` directly.

Reviewed by: bz, kib, markj
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D48743

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sys: Remove $FreeBSD$: two-line .h pattern

Remove /^\s*\*\n \*\s+\$FreeBSD\$$\n/

linuxkpi: swap.h: Fix include

Add needed includes so we can use it.

Reviewed by: bz
Fixes: c3f4f28c63da ("linuxkpi: Add some basic swap functions")
Sponsored by: Beckhoff Automation GmbH & Co. KG
D

linuxkpi: swap.h: Fix include

Add needed includes so we can use it.

Reviewed by: bz
Fixes: c3f4f28c63da ("linuxkpi: Add some basic swap functions")
Sponsored by: Beckhoff Automation GmbH & Co. KG
Differential Revision: https://reviews.freebsd.org/D36109

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LinuxKPI: Constantly use _LINUXKPI_ prefix in include guards

MFC after: 1 week
Reviewed by: bz, emaste, hselasky, manu
Differential Revision: https://reviews.freebsd.org/D33562

Merge ^/head r340427 through r340868.

linuxkpi: Use pageproc instead of vmproc

According to markj@:
pageproc contains the page daemon and laundry threads, which are
responsible for managing the LRU page queues and writing back dirty
pag

linuxkpi: Use pageproc instead of vmproc

According to markj@:
pageproc contains the page daemon and laundry threads, which are
responsible for managing the LRU page queues and writing back dirty
pages. vmproc's main task is to swap out kernel stacks when the system
is under memory pressure, and swap them back in when necessary. It's a
somewhat legacy component of the system and isn't required. You can
build a kernel without it by specifying "options NO_SWAPPING" (which is
a somewhat misleading name), in which vm_swapout_dummy.c is compiled
instead of vm_swapout.c.

Based on this, we want pageproc to emulate kswapd, not vmproc.

Reviewed by: markj
Differential Revision: https://reviews.freebsd.org/D18061

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linuxkpi: Remove duplicated text

Somehow this got botched while moving from git -> svn

linuxkpi: Add some basic swap functions

These are used by kms-drm to determine various heuristics relate
memory conditions.

The number of free swap pages is just a variable, and it can be
much chea

linuxkpi: Add some basic swap functions

These are used by kms-drm to determine various heuristics relate
memory conditions.

The number of free swap pages is just a variable, and it can be
much cheaper by either adding a new getter, or simply extern'ing
swap_total. However, this patch opts to use the more expensive,
existing interface - since this isn't an operation in a high per
path.

This allows us to remove some more gpl linuxkpi and do the follo
kms-drm:
git rm linuxkpi/gplv2/include/linux/swap.h

Reviewed by: mmacy, Johannes Lundberg <johalun0@gmail.com>
Approved by: emaste (mentor)
Differential Revision: https://reviews.freebsd.org/D18052

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