ARC: mm: preps ahead of HIGHMEM support #2
Explicit'ify that all memory added so far is low memory Nothing semantical Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
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336e2136e1
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6101be5ad4
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@ -24,16 +24,16 @@ pgd_t swapper_pg_dir[PTRS_PER_PGD] __aligned(PAGE_SIZE);
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char empty_zero_page[PAGE_SIZE] __aligned(PAGE_SIZE);
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EXPORT_SYMBOL(empty_zero_page);
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/* Default tot mem from .config */
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static unsigned long arc_mem_sz = 0x20000000; /* some default */
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static const unsigned long low_mem_start = CONFIG_LINUX_LINK_BASE;
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static unsigned long low_mem_sz;
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/* User can over-ride above with "mem=nnn[KkMm]" in cmdline */
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static int __init setup_mem_sz(char *str)
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{
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arc_mem_sz = memparse(str, NULL) & PAGE_MASK;
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low_mem_sz = memparse(str, NULL) & PAGE_MASK;
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/* early console might not be setup yet - it will show up later */
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pr_info("\"mem=%s\": mem sz set to %ldM\n", str, TO_MB(arc_mem_sz));
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pr_info("\"mem=%s\": mem sz set to %ldM\n", str, TO_MB(low_mem_sz));
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return 0;
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}
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@ -41,10 +41,10 @@ early_param("mem", setup_mem_sz);
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void __init early_init_dt_add_memory_arch(u64 base, u64 size)
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{
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arc_mem_sz = size & PAGE_MASK;
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pr_info("Memory size set via devicetree %ldM\n", TO_MB(arc_mem_sz));
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low_mem_sz = size;
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BUG_ON(base != low_mem_start);
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BUG_ON(base != CONFIG_LINUX_LINK_BASE);
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pr_info("Memory @ %llx of %ldM\n", base, TO_MB(size));
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}
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#ifdef CONFIG_BLK_DEV_INITRD
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@ -74,46 +74,34 @@ early_param("initrd", early_initrd);
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void __init setup_arch_memory(void)
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{
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unsigned long zones_size[MAX_NR_ZONES];
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unsigned long end_mem = CONFIG_LINUX_LINK_BASE + arc_mem_sz;
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init_mm.start_code = (unsigned long)_text;
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init_mm.end_code = (unsigned long)_etext;
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init_mm.end_data = (unsigned long)_edata;
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init_mm.brk = (unsigned long)_end;
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/*
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* We do it here, so that memory is correctly instantiated
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* even if "mem=xxx" cmline over-ride is given and/or
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* DT has memory node. Each causes an update to @arc_mem_sz
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* and we finally add memory one here
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*/
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memblock_add(CONFIG_LINUX_LINK_BASE, arc_mem_sz);
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/*------------- externs in mm need setting up ---------------*/
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/* first page of system - kernel .vector starts here */
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min_low_pfn = ARCH_PFN_OFFSET;
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/* Last usable page of low mem (no HIGHMEM yet for ARC port) */
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max_low_pfn = max_pfn = PFN_DOWN(end_mem);
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/* Last usable page of low mem */
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max_low_pfn = max_pfn = PFN_DOWN(low_mem_start + low_mem_sz);
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max_mapnr = max_low_pfn - min_low_pfn;
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/*------------- reserve kernel image -----------------------*/
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memblock_reserve(CONFIG_LINUX_LINK_BASE,
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__pa(_end) - CONFIG_LINUX_LINK_BASE);
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/*------------- bootmem allocator setup -----------------------*/
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memblock_add(low_mem_start, low_mem_sz);
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memblock_reserve(low_mem_start, __pa(_end) - low_mem_start);
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#ifdef CONFIG_BLK_DEV_INITRD
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/*------------- reserve initrd image -----------------------*/
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if (initrd_start)
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memblock_reserve(__pa(initrd_start), initrd_end - initrd_start);
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#endif
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memblock_dump_all();
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/*-------------- node setup --------------------------------*/
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/*----------------- node/zones setup --------------------------*/
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memset(zones_size, 0, sizeof(zones_size));
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zones_size[ZONE_NORMAL] = max_mapnr;
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zones_size[ZONE_NORMAL] = max_low_pfn - min_low_pfn;
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/*
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* We can't use the helper free_area_init(zones[]) because it uses
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