scsw_is_valid_key(9)

💖 scsw_is_valid_key(9) — Kernel API Manual 💖

okay bestie, pull up a seat 🫶 this page is from the Kernel API Manual and it is so niche in the best way. it checks a key field. that’s the whole assignment. iconic behavior, honestly ✨

🌸 NAME 🌸

scsw_is_valid_key — check key field validity 💅

✨ SYNOPSIS ✨

int scsw_is_valid_key (union scsw *scsw );

🎀 ARGUMENTS 🎀

• scsw — pointer to scsw 🫶

🦋 DESCRIPTION 🦋

okay so here’s the vibe check: scsw_is_valid_key returns non-zero if the key field of the specified scsw is valid 😌✨. and yes, it does this regardless of whether it is a transport mode or command mode scsw — both modes get the same love 💅.

if the field does not contain a valid value, it returns zero. no cap. that’s the whole function 🫶.

👑 SEE ALSO 👑

the whole scsw cinematic universe is linked here — starting with the kernel file at ./arch/s390/include/asm/scsw.h 📁✨

• Kernel file: ./arch/s390/include/asm/scsw.h
• structs: struct cmd_scsw(9), struct tm_scsw(9), struct eadm_scsw(9), union scsw(9)
• scsw basics: scsw_is_tm(9), scsw_key(9), scsw_eswf(9), scsw_cc(9), scsw_ectl(9), scsw_pno(9), scsw_fctl(9), scsw_actl(9), scsw_stctl(9), scsw_dstat(9), scsw_cstat(9)
• command mode validators: scsw_cmd_is_valid_key(9), scsw_cmd_is_valid_sctl(9), scsw_cmd_is_valid_eswf(9), scsw_cmd_is_valid_cc(9), scsw_cmd_is_valid_fmt(9), scsw_cmd_is_valid_pfch(9), scsw_cmd_is_valid_isic(9), scsw_cmd_is_valid_alcc(9), scsw_cmd_is_valid_ssi(9), scsw_cmd_is_valid_zcc(9), scsw_cmd_is_valid_ectl(9), scsw_cmd_is_valid_pno(9), scsw_cmd_is_valid_fctl(9), scsw_cmd_is_valid_actl(9), scsw_cmd_is_valid_stctl(9), scsw_cmd_is_valid_dstat(9), scsw_cmd_is_valid_cstat(9)
• transport mode validators: scsw_tm_is_valid_key(9), scsw_tm_is_valid_eswf(9), scsw_tm_is_valid_cc(9), scsw_tm_is_valid_fmt(9), scsw_tm_is_valid_x(9), scsw_tm_is_valid_q(9), scsw_tm_is_valid_ectl(9), scsw_tm_is_valid_pno(9), scsw_tm_is_valid_fctl(9), scsw_tm_is_valid_actl(9), scsw_tm_is_valid_stctl(9), scsw_tm_is_valid_dstat(9), scsw_tm_is_valid_cstat(9), scsw_tm_is_valid_fcxs(9), scsw_tm_is_valid_schxs(9)
• generic validators: scsw_is_valid_actl(9), scsw_is_valid_cc(9), scsw_is_valid_cstat(9), scsw_is_valid_dstat(9), scsw_is_valid_ectl(9), scsw_is_valid_eswf(9), scsw_is_valid_fctl(9), scsw_is_valid_pno(9), scsw_is_valid_stctl(9)
• solicited crew: scsw_cmd_is_solicited(9), scsw_tm_is_solicited(9), scsw_is_solicited(9)

that’s the tea ☕ this page lives under ./arch/s390/include/asm and is dated October 2026 🗓️. stay valid, bestie — mwah 💋💖