pr_devel(9)

💖 pr_devel(9) 💖

bestie, welcome to the Kernel API Manual entry for pr_devel — it's lowkey iconic and very "do I exist or not?" energy ✨

💅 NAME 💅

pr_devel — print a debug-level message conditionally 🎀

✨ SYNOPSIS ✨

okay so here's the call vibe check:

pr_devel (fmt , ... );

🦋 ARGUMENTS 🦋

what you're passing in, bestie 🫶

• fmt — format string
• ... — arguments for the format string

🌸 DESCRIPTION 🌸

okay so here's the actual tea ☕: pr_devel is a macro. If DEBUG is defined, it expands to a printk with the KERN_DEBUG loglevel. Otherwise it does nothing — like, literally nothing, no cap 💀

It uses pr_fmt to generate the format string, so that's the formatting pipeline you're working with 💅

🌈 SEE ALSO 🌈

Kernel file ./include/linux/printk.h and the rest of the squad:

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

that's the whole page, bestie 💖 source spot: ./include/linux, dated October 2026, and the name on the door is pr_devel(9) — periodt ✨🫶