vm_lowmem: Fix signature mismatches in vm_lowmem callbacks

This is required for kernel CFI.

Reviewed by: rrs, jhb, glebius
Differential Revision: https://reviews.freebsd.org/D49111

linuxkpi: Add `shrinker_alloc()` and `shrinker_free()`

They are used by the DRM drivers in Linux 6.7.

Bump `FreeBSD_version` because external drivers that use `struct
shrinker` will have to be reco

linuxkpi: Add `shrinker_alloc()` and `shrinker_free()`

They are used by the DRM drivers in Linux 6.7.

Bump `FreeBSD_version` because external drivers that use `struct
shrinker` will have to be recompiled.

Reviewed by: bz
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D48747

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sys: Automated cleanup of cdefs and other formatting

Apply the following automated changes to try to eliminate
no-longer-needed sys/cdefs.h includes as well as now-empty
blank lines in a row.

Remov

sys: Automated cleanup of cdefs and other formatting

Apply the following automated changes to try to eliminate
no-longer-needed sys/cdefs.h includes as well as now-empty
blank lines in a row.

Remove /^#if.*\n#endif.*\n#include\s+<sys/cdefs.h>.*\n/
Remove /\n+#include\s+<sys/cdefs.h>.*\n+#if.*\n#endif.*\n+/
Remove /\n+#if.*\n#endif.*\n+/
Remove /^#if.*\n#endif.*\n/
Remove /\n+#include\s+<sys/cdefs.h>\n#include\s+<sys/types.h>/
Remove /\n+#include\s+<sys/cdefs.h>\n#include\s+<sys/param.h>/
Remove /\n+#include\s+<sys/cdefs.h>\n#include\s+<sys/capsicum.h>/

Sponsored by: Netflix

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sys: Remove $FreeBSD$: one-line .c pattern

Remove /^[\s*]*__FBSDID\("\$FreeBSD\$"\);?\s*\n/

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

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

linuxkpi: Add `synchronize_shrinkers()`

It takes the lock and release it immediately to make sure no shrinkers
are running in parallel.

Reviewed by: manu
Approved by: manu
Differential Revision: ht

linuxkpi: Add `synchronize_shrinkers()`

It takes the lock and release it immediately to make sure no shrinkers
are running in parallel.

Reviewed by: manu
Approved by: manu
Differential Revision: https://reviews.freebsd.org/D38565

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LinuxKPI: Convert lkpi-shrinker lock to sx.

This fixes "might_sleep() with the following non-sleepable locks held:
exclusive sleep mutex lkpi-shrinker" warnings.

MFC after: 1 week
Reviewed by: hsel

LinuxKPI: Convert lkpi-shrinker lock to sx.

This fixes "might_sleep() with the following non-sleepable locks held:
exclusive sleep mutex lkpi-shrinker" warnings.

MFC after: 1 week
Reviewed by: hselasky, manu
Differential Revision: https://reviews.freebsd.org/D35047

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LinuxKPI: allocate current before taking shrinkers lock

This fixes following warnings when shrinkers are invoked first time:

uma_zalloc_debug: zone "lkpicurr" with the following non-sleepable
locks

LinuxKPI: allocate current before taking shrinkers lock

This fixes following warnings when shrinkers are invoked first time:

uma_zalloc_debug: zone "lkpicurr" with the following non-sleepable
locks held: exclusive sleep mutex lkpi-shrinker (lkpi-shrinker)

uma_zalloc_debug: zone "lkpimm" with the following non-sleepable locks
held: exclusive sleep mutex lkpi-shrinker (lkpi-shrinker)

Reviewed by: hselasky, manu
MFC after: 2 weeks
Differential revision: https://reviews.freebsd.org/D32066

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linuxkpi: Fix the shrinker scan target

Use the number of items scanned to control the duration of the shrink
loop. Otherwise, if a consumer like TTM is not able to free the number
of items requeste

linuxkpi: Fix the shrinker scan target

Use the number of items scanned to control the duration of the shrink
loop. Otherwise, if a consumer like TTM is not able to free the number
of items requested for some reason, the shrinker keeps looping forever.

Reviewed by: manu
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D28224

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linuxkpi: Add shrinker support

A driver can register a shrinker that will be called when the kernel
wants to free some memory.
Add support for that in linuxkpi and call the registered shrinkers
when

linuxkpi: Add shrinker support

A driver can register a shrinker that will be called when the kernel
wants to free some memory.
Add support for that in linuxkpi and call the registered shrinkers
when the lowmem event is triggered.

Reviewed by: bz
Differential Revision: https://reviews.freebsd.org/D27728

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