src/sys/compat/linuxkpi/common/include/linux/spinlock.h, branch stable/14

LinuxKPI: add supporting #includes

2026-04-01T04:33:47+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
PR:		279864
Reviewed by:	jhibbits, emaste
Differential Revision: https://reviews.freebsd.org/D55974

(cherry picked from commit 1d18872c2519d7ca726ddc49735180ab1d8916e0)
(cherry picked from commit 29dce45d8c50ea5858dc91a4294e83b8d72a2f80)

linuxkpi: spinlock: Simplify code

2024-06-04T11:22:40+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

(cherry picked from commit ae38a1a1bfdf320089c254e4dbffdf4769d89110)

linuxkpi: Fix spin_lock_init

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

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

(cherry picked from commit cff79fd02636f34010d8b835cc9e55401fa76e74)

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

LinuxKPI: Constantly use _LINUXKPI_ prefix in include guards

2022-01-10T19:49:38+00:00

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

LinuxKPI: Add some typical header pollution

2022-01-10T19:49:37+00:00

To reduce amount of drm-kmod patching

MFC after:	1 week
Reviewed by:	hselasky, manu
Differential Revision:	https://reviews.freebsd.org/D33297

linuxkpi: Add spin_trylock_irqsave() macro

2021-07-15T14:52:42+00:00

This is needed by the drm-kmod 5.6 update.

Reviewed by:		hselasky
MFC after:		3 days
Differential Revision:	https://reviews.freebsd.org/D30706

LinuxKPI: Change flags parameter type of atomic_dec_and_lock_irqsave

2021-07-05T00:19:01+00:00

On Linux atomic_dec_and_lock_irqsave is a wrapper macro which provides
a reference to third parameter rather than parameter value itself to
implementation routine called _atomic_dec_and_lock_irqsave [1].

While here, implement a fast path.

[1] https://github.com/torvalds/linux/blob/master/include/linux/spinlock.h#L476

Reviewed by:	hselasky
Differential revision:	https://reviews.freebsd.org/D30781