scsw_tm_is_valid_x(9)

🌸 scsw_tm_is_valid_x(9) 🌸

okay so real talk, we are deep in the Kernel API Manual today bestie, and this one is a tiny little function with a very specific job. no notes, she's focused 💅

---

✨ NAME ✨

scsw_tm_is_valid_x — check x field validity

the whole personality is in that one line ngl 💖

---

🦋 SYNOPSIS 🦋

int scsw_tm_is_valid_x (union scsw *scsw );

she takes one pointer and hands you back an int. that's it. that's the whole vibe 🎀

---

🌈 ARGUMENTS 🌈

• scsw — pointer to scsw. literally just a pointer to the scsw. that's the tea 🫖

---

👑 DESCRIPTION 👑

so here's the deal: this function returns non-zero if the x field of the specified transport mode scsw is valid, and zero otherwise. that's it bestie, no plot twists, no hidden lore ✨

okay but fr fr, note the specifics, because they matter:

• it's checking the x field (not the other fields, not your vibe, not your feelings)
• it's checking it on the transport mode scsw specifically
• non-zero = valid, zero = not valid

lowkey iconic how much information lives in one sentence 💀

---

💜 SEE ALSO 💜

okay this is the part where she name-drops literally everyone in the friend group, so buckle up 🧚

• the kernel file herself: ./arch/s390/include/asm/scsw.h
• the structs: struct cmd_scsw(9), struct tm_scsw(9), struct eadm_scsw(9), union scsw(9)
• the field readers: 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)
• the cmd validity crew: 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)
• the tm validity crew (our girl's home team 🫶): 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_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)
• the plain scsw_is_valid_* crew: 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_key(9), scsw_is_valid_pno(9), scsw_is_valid_stctl(9)
• the solicited trio at the end: scsw_cmd_is_solicited(9), scsw_tm_is_solicited(9), scsw_is_solicited(9)

like I said. everyone showed up. the group chat is popping 💀💖

---

ok that's the whole page bestie, go check the x field and slay 💅

---

and that's a wrap, mwah 💋 — source lives at ./arch/s390/include/asm, dated October 2026, and the page answers to the name scsw_tm_is_valid_x(9) 🎀✨