void __init mem_init()

in mm/init.c [184:245]

• 51 lines of code
• 1 McCabe index (conditional complexity)

void __init mem_init(void)
{
	phys_addr_t memory_start = memblock_start_of_DRAM();
	BUG_ON(!mem_map);
	set_max_mapnr_init();

	free_highmem();

	/* this will put all low memory onto the freelists */
	memblock_free_all();

	pr_info("virtual kernel memory layout:\n"
		"    fixmap  : 0x%08lx - 0x%08lx   (%4ld kB)\n"
#ifdef CONFIG_HIGHMEM
		"    pkmap   : 0x%08lx - 0x%08lx   (%4ld kB)\n"
#endif
		"    consist : 0x%08lx - 0x%08lx   (%4ld MB)\n"
		"    vmalloc : 0x%08lx - 0x%08lx   (%4ld MB)\n"
		"    lowmem  : 0x%08lx - 0x%08lx   (%4ld MB)\n"
		"      .init : 0x%08lx - 0x%08lx   (%4ld kB)\n"
		"      .data : 0x%08lx - 0x%08lx   (%4ld kB)\n"
		"      .text : 0x%08lx - 0x%08lx   (%4ld kB)\n",
		FIXADDR_START, FIXADDR_TOP, (FIXADDR_TOP - FIXADDR_START) >> 10,
#ifdef CONFIG_HIGHMEM
		PKMAP_BASE, PKMAP_BASE + LAST_PKMAP * PAGE_SIZE,
		(LAST_PKMAP * PAGE_SIZE) >> 10,
#endif
		CONSISTENT_BASE, CONSISTENT_END,
		((CONSISTENT_END) - (CONSISTENT_BASE)) >> 20, VMALLOC_START,
		(unsigned long)VMALLOC_END, (VMALLOC_END - VMALLOC_START) >> 20,
		(unsigned long)__va(memory_start), (unsigned long)high_memory,
		((unsigned long)high_memory -
		 (unsigned long)__va(memory_start)) >> 20,
		(unsigned long)&__init_begin, (unsigned long)&__init_end,
		((unsigned long)&__init_end -
		 (unsigned long)&__init_begin) >> 10, (unsigned long)&_etext,
		(unsigned long)&_edata,
		((unsigned long)&_edata - (unsigned long)&_etext) >> 10,
		(unsigned long)&_text, (unsigned long)&_etext,
		((unsigned long)&_etext - (unsigned long)&_text) >> 10);

	/*
	 * Check boundaries twice: Some fundamental inconsistencies can
	 * be detected at build time already.
	 */
#ifdef CONFIG_HIGHMEM
	BUILD_BUG_ON(PKMAP_BASE + LAST_PKMAP * PAGE_SIZE > FIXADDR_START);
	BUILD_BUG_ON((CONSISTENT_END) > PKMAP_BASE);
#endif
	BUILD_BUG_ON(VMALLOC_END > CONSISTENT_BASE);
	BUILD_BUG_ON(VMALLOC_START >= VMALLOC_END);

#ifdef CONFIG_HIGHMEM
	BUG_ON(PKMAP_BASE + LAST_PKMAP * PAGE_SIZE > FIXADDR_START);
	BUG_ON(CONSISTENT_END > PKMAP_BASE);
#endif
	BUG_ON(VMALLOC_END > CONSISTENT_BASE);
	BUG_ON(VMALLOC_START >= VMALLOC_END);
	BUG_ON((unsigned long)high_memory > VMALLOC_START);

	return;
}