static void __init build_tag_list()

in kernel/atags_compat.c [92:208]

• 101 lines of code
• 12 McCabe index (conditional complexity)

static void __init build_tag_list(struct param_struct *params, void *taglist)
{
	struct tag *tag = taglist;

	if (params->u1.s.page_size != PAGE_SIZE) {
		pr_warn("Warning: bad configuration page, trying to continue\n");
		return;
	}

	printk(KERN_DEBUG "Converting old-style param struct to taglist\n");

#ifdef CONFIG_ARCH_NETWINDER
	if (params->u1.s.nr_pages != 0x02000 &&
	    params->u1.s.nr_pages != 0x04000 &&
	    params->u1.s.nr_pages != 0x08000 &&
	    params->u1.s.nr_pages != 0x10000) {
		pr_warn("Warning: bad NeTTrom parameters detected, using defaults\n");

		params->u1.s.nr_pages = 0x1000;	/* 16MB */
		params->u1.s.ramdisk_size = 0;
		params->u1.s.flags = FLAG_READONLY;
		params->u1.s.initrd_start = 0;
		params->u1.s.initrd_size = 0;
		params->u1.s.rd_start = 0;
	}
#endif

	tag->hdr.tag  = ATAG_CORE;
	tag->hdr.size = tag_size(tag_core);
	tag->u.core.flags = params->u1.s.flags & FLAG_READONLY;
	tag->u.core.pagesize = params->u1.s.page_size;
	tag->u.core.rootdev = params->u1.s.rootdev;

	tag = tag_next(tag);
	tag->hdr.tag = ATAG_RAMDISK;
	tag->hdr.size = tag_size(tag_ramdisk);
	tag->u.ramdisk.flags = (params->u1.s.flags & FLAG_RDLOAD ? 1 : 0) |
			       (params->u1.s.flags & FLAG_RDPROMPT ? 2 : 0);
	tag->u.ramdisk.size  = params->u1.s.ramdisk_size;
	tag->u.ramdisk.start = params->u1.s.rd_start;

	tag = tag_next(tag);
	tag->hdr.tag = ATAG_INITRD;
	tag->hdr.size = tag_size(tag_initrd);
	tag->u.initrd.start = params->u1.s.initrd_start;
	tag->u.initrd.size  = params->u1.s.initrd_size;

	tag = tag_next(tag);
	tag->hdr.tag = ATAG_SERIAL;
	tag->hdr.size = tag_size(tag_serialnr);
	tag->u.serialnr.low = params->u1.s.system_serial_low;
	tag->u.serialnr.high = params->u1.s.system_serial_high;

	tag = tag_next(tag);
	tag->hdr.tag = ATAG_REVISION;
	tag->hdr.size = tag_size(tag_revision);
	tag->u.revision.rev = params->u1.s.system_rev;

#ifdef CONFIG_ARCH_ACORN
	if (machine_is_riscpc()) {
		int i;
		for (i = 0; i < 4; i++)
			tag = memtag(tag, PHYS_OFFSET + (i << 26),
				 params->u1.s.pages_in_bank[i] * PAGE_SIZE);
	} else
#endif
	tag = memtag(tag, PHYS_OFFSET, params->u1.s.nr_pages * PAGE_SIZE);

#ifdef CONFIG_FOOTBRIDGE
	if (params->u1.s.mem_fclk_21285) {
		tag = tag_next(tag);
		tag->hdr.tag = ATAG_MEMCLK;
		tag->hdr.size = tag_size(tag_memclk);
		tag->u.memclk.fmemclk = params->u1.s.mem_fclk_21285;
	}
#endif

#ifdef CONFIG_ARCH_EBSA285
	if (machine_is_ebsa285()) {
		tag = tag_next(tag);
		tag->hdr.tag = ATAG_VIDEOTEXT;
		tag->hdr.size = tag_size(tag_videotext);
		tag->u.videotext.x            = params->u1.s.video_x;
		tag->u.videotext.y            = params->u1.s.video_y;
		tag->u.videotext.video_page   = 0;
		tag->u.videotext.video_mode   = 0;
		tag->u.videotext.video_cols   = params->u1.s.video_num_cols;
		tag->u.videotext.video_ega_bx = 0;
		tag->u.videotext.video_lines  = params->u1.s.video_num_rows;
		tag->u.videotext.video_isvga  = 1;
		tag->u.videotext.video_points = 8;
	}
#endif

#ifdef CONFIG_ARCH_ACORN
	tag = tag_next(tag);
	tag->hdr.tag = ATAG_ACORN;
	tag->hdr.size = tag_size(tag_acorn);
	tag->u.acorn.memc_control_reg = params->u1.s.memc_control_reg;
	tag->u.acorn.vram_pages       = params->u1.s.pages_in_vram;
	tag->u.acorn.sounddefault     = params->u1.s.sounddefault;
	tag->u.acorn.adfsdrives       = params->u1.s.adfsdrives;
#endif

	tag = tag_next(tag);
	tag->hdr.tag = ATAG_CMDLINE;
	tag->hdr.size = (strlen(params->commandline) + 3 +
			 sizeof(struct tag_header)) >> 2;
	strcpy(tag->u.cmdline.cmdline, params->commandline);

	tag = tag_next(tag);
	tag->hdr.tag = ATAG_NONE;
	tag->hdr.size = 0;

	memmove(params, taglist, ((int)tag) - ((int)taglist) +
				 sizeof(struct tag_header));
}