pr_alert(9)

💜 pr_alert(9) — Kernel API Manual, bestie edition 💜

Okay so we're doing the pr_alert page from the Kernel API Manual and honestly? It's a short one, so let's just get into it ✨

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🌸 NAME 🌸

pr_alert — Print an alert-level message. That's it. That's the whole vibe check. 💅

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🎀 SYNOPSIS 🎀

pr_alert (fmt , ... );

Yes bestie, those spaces are real, keep them exactly like that, no cap 👑

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🦋 ARGUMENTS 🦋

• fmt — the format string, aka the blueprint of whatever you're about to yell into the kernel log 🗣️
• ... — the arguments for the format string, i.e. all the little values that get slotted into your fmt 💖

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✨ DESCRIPTION ✨

So here's the tea ☕ — this macro literally expands to a printk with the KERN_ALERT loglevel. That's the whole flex. It uses pr_fmt to generate the format string, which is how your messages get that cute consistent prefix energy 🎀

Lowkey iconic that a one-liner gets its own manpage, but we respect it 🫶

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🌈 SEE ALSO 🌈

Kernel file ./include/linux/printk.h and its whole friend group:

• printk_cpu_sync_get_irqsave(9)
• printk_cpu_sync_put_irqrestore(9)
• pr_fmt(9)
• printk(9)
• pr_emerg(9)
• pr_crit(9)
• pr_err(9)
• pr_warn(9)
• pr_notice(9)
• pr_info(9)
• pr_cont(9)
• pr_devel(9)
• pr_debug(9)
• print_hex_dump_bytes(9)

Go read them, they're all slaying in their own way 💅✨

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Fr fr though, pr_alert is a macro, so nothing is undefined here — just remember it's expanding to printk with KERN_ALERT and using pr_fmt. That's the entire plot 😭💖

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And that's the page!! Signing off from ./include/linux, dated October 2026 🗓️🧚 stay alert bestie, literally 💜👑