src/sys/compat/linuxkpi/common/include/linux/spinlock.h, branch main

LinuxKPI: add supporting #includes

2026-03-21T21:16:43+00:00

Compiling drm-kmod on !X86 does not include asm/smp.h which includes
preempt.h on FreeBSD.  In order to compile drm-kmod on other
architectures add the secondary #includes for preempt.h to
spinlock.h and hardirq.h (which now also gets included from highmem.h)
to connect the #include chain.

Sponsored by:	The FreeBSD Foundation
MFC after:	3 days
PR:		279864
Reviewed by:	jhibbits, emaste
Differential Revision: https://reviews.freebsd.org/D55974

LinuxKPI: add scoped_guard(), spinlock guard support

2026-02-09T21:49:45+00:00

The "cleanup.h" implementation got a bit more complicated.

For one we now use a macro to concatenate a prefix, the name, and a
suffix for variable and function declarations.  This was triggered
by the fact that the "guard_" prefix we used was confusing.  We now
use a generic "cleanup_" which is only encoded in the single place
rather than all over the file.

As already indicated by the comment the DEFINE_LOCK_GUARD_0()
macro got split up and a _1 version which also takes a type got
implemented and is used for a spinlock variant used by rtw89(4)
via the new scoped_guard() bits.

Sponsored by:	The FreeBSD Foundation
MFC after:	3 days
Differential Revision:	https://reviews.freebsd.org/D54808

linuxkpi: Define `raw_spinlock_t` in

2026-01-07T21:38:36+00:00

For now, it is synonymous to `spinlock_t`. The DRM generic code uses the
`struct raw_spinlock` and not `raw_spinlock_t`, that's why the
definition is a struct embedding a `struct mtx`, compared to
`spinlock_t` which is a simpler typedef.

The DRM generic code started to use it in Linux 6.10.

Reviewed by:	bz, christos
Sponsored by:	The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D54489

linuxkpi: Add `local_irq_{save,restore}()`

2025-04-07T17:36:12+00:00

These are no-ops.

The i915 DRM driver started to use it in Linux 6.8.

Reviewed by:	bz
Sponsored by:   The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D49380

linuxkpi: Fix spin_lock_init

2024-05-17T05:58:59+00:00

Some linux code re-init some spinlock so add MTX_NEW to mtx_init.

Reported by:	David Wolfskill 
Fixes:		ae38a1a1bfdf ("linuxkpi: spinlock: Simplify code")

linuxkpi: spinlock: Simplify code

2024-05-16T07:39:36+00:00

Just use a typedef for spinlock_t, no need to create a useless
structure.

Reviewed by:		bz, emaste
Sponsored by:		Beckhoff Automation GmbH & Co. KG
Differential Revision:	https://reviews.freebsd.org/D45205

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

2023-08-16T17:54:11+00:00

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

LinuxKPI: Appease -Wunused-but-set-variable warnings from GCC.

2023-03-31T17:56:33+00:00

- Mark assert dummy variables as __unused.

- Use a dummy (void) cast of the flags argument passed to
  spin_unlock_irqrestore so it gets treated as used.

Reviewed by:	manu, hselasky
Differential Revision:	https://reviews.freebsd.org/D39349

Revert "LinuxKPI: Allow spin_lock_irqsave to be called within a critical section"

2022-01-26T22:27:01+00:00

This change results in deadlocks on UP systems

This reverts commit 7dea0c9e6eba4dc127cd67667c81fa2c250f1024.

Requested by:	kib, hselasky

LinuxKPI: Allow spin_lock_irqsave to be called within a critical section

2022-01-18T20:14:12+00:00

with spinning on spin_trylock. dma-buf part of drm-kmod depends on this
property and absence of it support results in "mi_switch: switch in a
critical section" assertions [1][2].

[1] https://github.com/freebsd/drm-kmod/issues/116
[2] https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=261166

MFC after:	1 week
Reviewed by:	manu
Differential Revision:	https://reviews.freebsd.org/D33887