#define Labyrinth (void *)alloc_page(gfp_atomic) < 2027 >

“And the cast to (void * ?” she asked.

Elara leaned back. “Explain it like I’m a CPU.” #define labyrinth (void *)alloc_page(gfp_atomic)

“That’s the trick. The kernel returns a struct page * . But a labyrinth isn’t a structure—it’s a raw void. Just an address. A place where you don’t know the rules yet. You step inside, and you have to map it yourself.” “And the cast to (void *

void *escape = labyrinth; if (!escape) panic("No way out. System halts."); “If alloc_page fails in an atomic context,” Kai said, “the kernel can’t wait to free memory. It either has a pre-prepared escape route—this page—or it dies. The labyrinth is that route. A guaranteed room, reserved ahead of time, that you only enter when the world is collapsing.” The kernel returns a struct page *

#define labyrinth (void *)alloc_page(gfp_atomic) “This,” she said, pointing at the screen, “is either the cleverest thing you’ve written or the start of your villain origin story.”

Kai grinned. “ alloc_page(gfp_atomic) grabs a single page of physical memory right now . No sleeping, no waiting for disk I/O. If it fails, it fails instantly. gfp_atomic is the ‘no excuses’ flag—used inside interrupt handlers, spinlocks, the deep scary places.”