drm_kunit_he..._create_crtc(9)

💅 drm_kunit_he..._create_crtc(9)

okay so bestie, welcome to the Kernel API Manual — yes, the actual kernel docs, but make it a group chat 🫶. We're talking about drm_kunit_he..._create_crtc (the header truncates it, it's really drm_kunit_helper_create_crtc, iykyk). Buckle up, this one's a little mock-CRTC-making icon ✨.

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✨ NAME ✨

drm_kunit_helper_create_crtc — literally creates a mock CRTC for a KUnit test 🎀

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🌸 SYNOPSIS 🌸

struct drm_crtc * drm_kunit_helper_create_crtc (struct kunit *test ,
       struct drm_device *drm , struct drm_plane *primary , struct drm_plane
       *cursor , const struct drm_crtc_funcs *funcs , const struct
       drm_crtc_helper_funcs *helper_funcs );

that's the whole signature, no cap. six arguments, all of them matter, we do not skip 💅

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🦋 ARGUMENTS 🦋

• test — the test context object. your KUnit bestie holding the whole thing together 💖
• drm — the device to alloc the plane for.
• primary — primary plane for the CRTC. main character energy, fr.
• cursor — cursor plane for the CRTC. Optional, so she can sit this one out 🙈
• funcs — callbacks for the new plane. Optional too 👑
• helper_funcs — helpers callbacks for the new plane. also Optional, she's chill like that 🌈

ngl there's a lot of "optional" energy up in here, but the ones that aren't optional? they're really not optional, so don't play with it 💀

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⭐ DESCRIPTION ⭐

This allocates and initializes a mock struct drm_crtc — like, a whole pretend CRTC — meant to be part of a mock device for a KUnit test 🧚

Resources will be cleaned up automatically. yes bestie, automatic, you don't have to lift a finger, obsessed 😭

funcs will default to the default helpers implementations. helper_funcs will default to an empty implementation. so if you're like "idk what to pass" — you can literally just not, and the defaults carry you 🫶

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👑 RETURN 👑

A pointer to the new CRTC, or an ERR_PTR otherwise. so like, check it before you go dereferencing, bestie, that's the vibe check 🔥

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💜 SEE ALSO 💜

• Kernel file ./drivers/gpu/drm/tests/drm_kunit_helpers.c
• drm_kunit_helper_alloc_device(9)
• drm_kunit_helper_free_device(9)
• drm_kunit_helper_atomic_state_alloc(9)
• drm_kunit_helper_create_primary_plane(9)
• drm_kunit_helper_enable_crtc_connector(9)
• drm_kunit_add_mode_destroy_action(9)
• drm_kunit_display_mode_from_cea_vic(9)

the whole squad, all accounted for, no one left behind 💖✨

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and that's the page!! source lives in ./drivers/gpu/drm/tests, dated October 2026, and we're all reading it through the drm_kunit_he..._create_crtc(9) lens 🎀 slay, go write your tests, periodt 💅