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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>
hifive-unleashed-5.1
Vineet Gupta 2015-10-28 18:48:17 +05:30
parent 336e2136e1
commit 6101be5ad4
1 changed files with 14 additions and 26 deletions
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40
arch/arc/mm/init.c
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@ -24,16 +24,16 @@ pgd_t swapper_pg_dir[PTRS_PER_PGD] __aligned(PAGE_SIZE);
char empty_zero_page[PAGE_SIZE] __aligned(PAGE_SIZE);
EXPORT_SYMBOL(empty_zero_page);
/* Default tot mem from .config */
static unsigned long arc_mem_sz = 0x20000000; /* some default */
static const unsigned long low_mem_start = CONFIG_LINUX_LINK_BASE;
static unsigned long low_mem_sz;
/* User can over-ride above with "mem=nnn[KkMm]" in cmdline */
static int __init setup_mem_sz(char *str)
{
arc_mem_sz = memparse(str, NULL) & PAGE_MASK;
low_mem_sz = memparse(str, NULL) & PAGE_MASK;
/* early console might not be setup yet - it will show up later */
pr_info("\"mem=%s\": mem sz set to %ldM\n", str, TO_MB(arc_mem_sz));
pr_info("\"mem=%s\": mem sz set to %ldM\n", str, TO_MB(low_mem_sz));
return 0;
}
@ -41,10 +41,10 @@ early_param("mem", setup_mem_sz);
void __init early_init_dt_add_memory_arch(u64 base, u64 size)
{
arc_mem_sz = size & PAGE_MASK;
pr_info("Memory size set via devicetree %ldM\n", TO_MB(arc_mem_sz));
low_mem_sz = size;
BUG_ON(base != low_mem_start);
BUG_ON(base != CONFIG_LINUX_LINK_BASE);
pr_info("Memory @ %llx of %ldM\n", base, TO_MB(size));
}
#ifdef CONFIG_BLK_DEV_INITRD
@ -74,46 +74,34 @@ early_param("initrd", early_initrd);
void __init setup_arch_memory(void)
{
unsigned long zones_size[MAX_NR_ZONES];
unsigned long end_mem = CONFIG_LINUX_LINK_BASE + arc_mem_sz;
init_mm.start_code = (unsigned long)_text;
init_mm.end_code = (unsigned long)_etext;
init_mm.end_data = (unsigned long)_edata;
init_mm.brk = (unsigned long)_end;
/*
* We do it here, so that memory is correctly instantiated
* even if "mem=xxx" cmline over-ride is given and/or
* DT has memory node. Each causes an update to @arc_mem_sz
* and we finally add memory one here
*/
memblock_add(CONFIG_LINUX_LINK_BASE, arc_mem_sz);
/*------------- externs in mm need setting up ---------------*/
/* first page of system - kernel .vector starts here */
min_low_pfn = ARCH_PFN_OFFSET;
/* Last usable page of low mem (no HIGHMEM yet for ARC port) */
max_low_pfn = max_pfn = PFN_DOWN(end_mem);
/* Last usable page of low mem */
max_low_pfn = max_pfn = PFN_DOWN(low_mem_start + low_mem_sz);
max_mapnr = max_low_pfn - min_low_pfn;
/*------------- reserve kernel image -----------------------*/
memblock_reserve(CONFIG_LINUX_LINK_BASE,
__pa(_end) - CONFIG_LINUX_LINK_BASE);
/*------------- bootmem allocator setup -----------------------*/
memblock_add(low_mem_start, low_mem_sz);
memblock_reserve(low_mem_start, __pa(_end) - low_mem_start);
#ifdef CONFIG_BLK_DEV_INITRD
/*------------- reserve initrd image -----------------------*/
if (initrd_start)
memblock_reserve(__pa(initrd_start), initrd_end - initrd_start);
#endif
memblock_dump_all();
/*-------------- node setup --------------------------------*/
/*----------------- node/zones setup --------------------------*/
memset(zones_size, 0, sizeof(zones_size));
zones_size[ZONE_NORMAL] = max_mapnr;
zones_size[ZONE_NORMAL] = max_low_pfn - min_low_pfn;
/*
* We can't use the helper free_area_init(zones[]) because it uses