arch_do_signal_or_restart(9)

✨ arch_do_signal_or_restart 💅

okay bestie, so this is a page from the Kernel API Manual (yes, the kernel has a manual, and yes it's kind of iconic) — and today's main character is arch_do_signal_or_restart. it's the architecture-specific signal delivery function, and honestly? it ate. let's get into it 🎀

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🌸 NAME 🌸

arch_do_signal_or_restart — the architecture specific signal delivery function. that's it, that's the vibe. no cap, its whole personality is "i deliver signals, but like, per-architecture" 🦋

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✨ SYNOPSIS ✨

void arch_do_signal_or_restart (struct pt_regs *regs );

she takes exactly one argument and returns literally nothing (void, we love a function that doesn't overpromise 💖). keep reading for the deets on that arg 👑

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🫶 ARGUMENTS 🫶

• regs — a pointer to the current's pt_regs. like, current the task, its pt_regs, pointed at. that's the whole deal 🧚

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💜 DESCRIPTION 💜

so when does this baddie get called? it's invoked from exit_to_user_mode_loop. periodt. that's the entire description — she does not elaborate, she does not explain herself, she simply gets invoked from exit_to_user_mode_loop and leaves 🔥

lowkey yes the description is short, but that's literally all the original gives us — no invented lore, no extra tips, we respect the source material 💅

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🌈 SEE ALSO 🌈

bestie, the cross-reference list is LONG and it's giving "everyone wants to be in the group chat". first up, the kernel file where the magic lives:

• Kernel file ./include/linux/irq-entry-common.h

and now, the whole friend group, in this exact order, no skipping 👑:

• arch_enter_from_user_mode(9)
• arch_in_rcu_eqs(9)
• enter_from_user_mode(9)
• arch_exit_to_user_mode_work(9)
• arch_exit_to_user_mode_prepare(9)
• arch_exit_to_user_mode(9)
• __exit_to_user_mode_prepare(9)
• syscall_exit_to_user_mode_prepare(9)
• irqentry_exit_to_user_mode_prepare(9)
• exit_to_user_mode(9)
• irqentry_enter_from_user_mode(9)
• irqentry_exit_to_user_mode(9)
• struct irqentry_state(9)
• irqentry_enter_from_kernel_mode(9)
• irqentry_exit_to_kernel_mode_preempt(9)
• irqentry_exit_to_kernel_mode_after_preempt(9)
• irqentry_exit_to_kernel_mode(9)
• irqentry_enter(9)
• irqentry_exit(9)
• irqentry_nmi_enter(9)
• irqentry_nmi_exit(9)

like, that's the whole entry/exit-to-user-mode cinematic universe and arch_do_signal_or_restart is literally in it. iykyk ⭐

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and that's the page, bestie — go forth and deliver those signals 💖✨🎀🦋🌸💅🫶

sign-off szn: this lil masterpiece lives under the ./include/linux directory, the manual is dated October 2026, and the page name is arch_do_signal_or_restart(9) — all together now, slay 💀👑🍓