LinuxKPI: Add linux/capability.h header

[wulf]

Summary

Required by drm-kmod.

Obtained from: DragonflyBSD
MFC after: 1 week

[• hselasky]

sys/compat/linuxkpi/common/include/linux/capability.h

35

This line you can remove. Doesn't say anything useful.

[manu]

sys/compat/linuxkpi/common/include/linux/capability.h

46

Currently in drm-kmod for CAP_SYS_NICE we check PRIV_DRIVER too. But I'm not familiar with this subsystem to check if this one is better.

[wulf]

sys/compat/linuxkpi/common/include/linux/capability.h

46

Currently in drm-kmod for CAP_SYS_NICE we check PRIV_DRIVER too. But I'm not familiar with this subsystem to check if this one is better.

Here is comments of CAP_SYS_NICE and PRIV_SCHED_SETPRIORITY collected in code and docs:

Linux capabilities(7): CAP_SYS_NICE Lower the process nice value
FreeBSD sys/priv.h: #define PRIV_SCHED_SETPRIORITY 201 /* Can set lower nice value for proc. */
drm-kmod include/uapi/drm/amdgpu_drm.h: * When used in struct drm_amdgpu_ctx_in, a priority above NORMAL requires CAP_SYS_NICE
drm-kmod i915 code:

if (priority > I915_CONTEXT_DEFAULT_PRIORITY &&
    !capable(CAP_SYS_NICE))
        return -EPERM;

It looks that PRIV_SCHED_SETPRIORITY matches CAP_SYS_NICE better than PRIV_DRIVER

[manu]

sys/compat/linuxkpi/common/include/linux/capability.h

46

Fine by me then.