ARGS_SEP_COMMA(9)

💅 ARGS_SEP_COMMA(9) — like, the comma one, from the Kernel API Manual ✨

okay bestie, sit down, because today we're talking about ARGS_SEP_COMMA, and honestly? it's giving tiny-but-powerful. 🎀

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🌸 NAME 🌸

ARGS_SEP_COMMA — the actual definition of a comma character, no cap. it's literally just a comma and it's carrying the whole preprocessor on its back. 🔥

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🦋 SYNOPSIS 🦋

ARGS_SEP_COMMA

that's it. that's the whole synopsis. iconic behaviour, honestly. 👑

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✨ DESCRIPTION ✨

so here's the vibe check: this definition is the move when some intermediate macro is out here expecting a fixed number of arguments, but you — main character that you are — want to pass more arguments than that. and those extra arguments can only be properly evaluated by the next level macro. iykyk. 💫

basically it's the comma you slip in so the arg-counting girlies stay fed and the expansion happens at the right depth. slay. 🫶

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💖 EXAMPLE 💖

here's the moment. look at this:

#define foo(f)  f(X) f(Y) f(Z) f(Q)
#define bar DROP_FIRST_ARG(foo(ARGS_SEP_COMMA __stringify))
#define buz CALL_ARGS(COUNT_ARGS, DROP_FIRST_ARG(foo(ARGS_SEP_COMMA)))

with the definitions above, bar expands to "X", "Y", "Z", "Q" and buz expands to 4.

not me getting emotional over a macro expanding correctly 😭 it's literally perfect.

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🎀 SEE ALSO 🎀

• the kernel file ./drivers/gpu/drm/xe/xe_args.h — go read it, bestie, it's the whole friend group 💜
• CALL_ARGS(9)
• DROP_FIRST_ARG(9)
• FIRST_ARG(9)
• LAST_ARG(9)
• PICK_ARG(9)
• IF_ARGS(9)

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and that's the whole page, periodt 💅✨ this lil masterpiece lives in ./drivers/gpu/drm/xe, dated October 2026 — mwah, go forth and comma responsibly, bestie 🍓🧚