castable_to_type(9)

💖 NAME: castable_to_type(9) 💖

okay so bestie, welcome to the manual page for castable_to_type(9) — yes, that's the manual name, and it's from the Kernel API Manual. This thing is like __same_type(), but it also allows for casted literals. slay. 💅✨

🦋 SYNOPSIS 🦋

castable_to_type (n , T );

🌸 ARGUMENTS 🌸

• n — a variable or constant value. literally either vibe is allowed in this slot. 🍓
• T — a variable or data type. it's the second argument, bestie. 🎀

💅 DESCRIPTION 💅

here's the actual tea, no cap: unlike the __same_type macro, this allows a constant value as the first argument. If this value would not overflow into an assignment of the second argument's type, it returns true. Otherwise, this falls back to __same_type. that's the whole bit — iconic, concise, done. 🫶🔥

🌈 SEE ALSO 🌈

Kernel file ./include/linux/overflow.h, plus the whole overflow bestie lineup:

• check_add_overflow(9)
• wrapping_add(9)
• wrapping_assign_add(9)
• check_sub_overflow(9)
• wrapping_sub(9)
• wrapping_assign_sub(9)
• check_mul_overflow(9)
• wrapping_mul(9)
• check_shl_overflow(9)
• overflows_type(9)
• range_overflows(9)
• range_overflows_t(9)
• range_end_overflows(9)
• range_end_overflows_t(9)
• size_mul(9)
• size_add(9)
• size_sub(9)
• array_size(9)
• array3_size(9)
• flex_array_size(9)
• struct_size(9)
• struct_size_t(9)
• struct_offset(9)
• __DEFINE_FLEX(9)
• _DEFINE_FLEX(9)
• DEFINE_RAW_FLEX(9)
• DEFINE_FLEX(9)
• STACK_FLEX_ARRAY_SIZE(9)
• typeof_flex_counter(9)
• overflows_flex_counter_type(9)
• __set_flex_counter(9)

and that's the page, bestie! 💌 source/version: ./include/linux; date: October 2026. mwah 💋