__wait_for(9)

💅 NAME 💅

__wait_for — magic wait macro ✨

Okay so this page is straight out of the Kernel API Manual, and we’re talking about __wait_for(9), bestie. The name is literally “magic wait macro” and honestly? Iconic.

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🦋 SYNOPSIS 🦋

__wait_for (OP , COND , US , Wmin , Wmax );

Yes, all those capitals are real. Slay.

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🎀 ARGUMENTS 🎀

The manual is being mysterious with these, no cap. Every single one is listed as -- undescribed --, so I’m not gonna invent lore that isn’t there:

• OP — -- undescribed -- 😭
• COND — -- undescribed -- 🫶
• US — -- undescribed -- 💀
• Wmin — -- undescribed -- 🙈
• Wmax — -- undescribed -- 🌸

That’s it. That’s the whole argument section. The mystery is the moment.

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✨ DESCRIPTION ✨

So __wait_for is a macro designed to help you avoid open coding check/wait/timeout patterns. Basically it’s here so you don’t have to hand-roll the same little wait-loop situation over and over, iykyk.

Now the important caveat, and please don’t skip this part:

It’s important that we check the condition again after having timed out. Why? Because the timeout could be due to preemption or similar, and we’ve never had a chance to check the condition before the timeout. So yeah — re-check the condition after timeout. That’s the vibe check that actually matters. 🔥

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🌈 SEE ALSO 🌈

• Kernel file ./drivers/gpu/drm/vc4/vc4_drv.h
• struct vc4_texture_sample_info(9)
• struct vc4_validated_shader_info(9)

Go read those if you want the full lore, bestie. 📚✨

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And that’s the page, mwah 💋 — source/version path ./drivers/gpu/drm/vc4, dated October 2026, and it’s all about __wait_for(9). Periodt. 👑