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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linuxkpi: Move `release_pages()` to linux_page.c

We want to avoid putting code managing memory in inline functions in the
future.

Reviewed by: markj
Sponsored by: The FreeBSD Foundation
Differentia

linuxkpi: Move `release_pages()` to linux_page.c

We want to avoid putting code managing memory in inline functions in the
future.

Reviewed by: markj
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D49810

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linuxkpi: Move `invalidate_mapping_pages()` to <linux/pagemap.h>

[Why]
This is consistent with Linux.

[How]
The definition is moved from <linux/shmem_fs.h> to <linux/pagemap.h> and
the latter is in

linuxkpi: Move `invalidate_mapping_pages()` to <linux/pagemap.h>

[Why]
This is consistent with Linux.

[How]
The definition is moved from <linux/shmem_fs.h> to <linux/pagemap.h> and
the latter is included from the former. This is how it is done on Linux.

Prototypes are also expanded with argument names. I got a build failure
in the DRM 5.18 drivers because the compiler considered that the
`pgoff_t` argument was there twice.

Reviewed by: manu
Approved by: manu
Differential Revision: https://reviews.freebsd.org/D43018

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

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

linuxkpi: Include <linux/vmalloc.h> from <linux/pagemap.h>

I'm not sure this is correct, but it gives access to the definition of
`PAGE_KERNEL` in `ttm_tt.c` in the DRM drivers.

Reviewed by: manu
A

linuxkpi: Include <linux/vmalloc.h> from <linux/pagemap.h>

I'm not sure this is correct, but it gives access to the definition of
`PAGE_KERNEL` in `ttm_tt.c` in the DRM drivers.

Reviewed by: manu
Approved by: manu
Differential Revision: https://reviews.freebsd.org/D38154

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linuxkpi: Include highmem.h in pagemap.h

Linux does the same.

Reviewed by: bz, emaste, hselasky
Sponsored by: Beckhoff Automation GmbH & Co. KG
Differential Revision: https://reviews.freebsd.org/D3

linuxkpi: Include highmem.h in pagemap.h

Linux does the same.

Reviewed by: bz, emaste, hselasky
Sponsored by: Beckhoff Automation GmbH & Co. KG
Differential Revision: https://reviews.freebsd.org/D36023

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linuxkpi: Add mapping_clear_unevictable stub

Reviewed by: hselasky
Obtained from: drm-kmod
Sponsored by: Beckhoff Automation GmbH & Co. KG
Differential Revision: https://reviews.freebsd.org/D35939

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

linuxkpi: Add pagemap.h

Add release_pages needed by drm which simply calls put_page for
all the pages provided

Reviewed by: bz
Sponsored by: The FreeBSD Foundation
Differential Revision: https://re

linuxkpi: Add pagemap.h

Add release_pages needed by drm which simply calls put_page for
all the pages provided

Reviewed by: bz
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D26680

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