On Wed, 2013-05-08 at 23:51 +0800, Jiang Liu wrote:
> Prepare for removing num_physpages and simplify mem_init().
No objection, I haven't had a chance to actually build/boot test though.
BTW. A recommended way of doing so which is pretty easy even if you
don't have access to powerpc hardware nowadays is to use
qemu-system-ppc64 with -M pseries.
You can find cross compilers for the kernel on kernel.org and you can
feed qemu with some distro installer ISO.
Cheers,
Ben.
> Signed-off-by: Jiang Liu <jiang....@huawei.com>
> Cc: Benjamin Herrenschmidt <b...@kernel.crashing.org>
> Cc: Paul Mackerras <pau...@samba.org>
> Cc: linuxppc-dev@lists.ozlabs.org
> Cc: linux-ker...@vger.kernel.org
> ---
> arch/powerpc/mm/mem.c | 56
> +++++++++++--------------------------------------
> 1 file changed, 12 insertions(+), 44 deletions(-)
>
> diff --git a/arch/powerpc/mm/mem.c b/arch/powerpc/mm/mem.c
> index b890245..4e24f1c 100644
> --- a/arch/powerpc/mm/mem.c
> +++ b/arch/powerpc/mm/mem.c
> @@ -299,46 +299,27 @@ void __init paging_init(void)
>
> void __init mem_init(void)
> {
> -#ifdef CONFIG_NEED_MULTIPLE_NODES
> - int nid;
> -#endif
> - pg_data_t *pgdat;
> - unsigned long i;
> - struct page *page;
> - unsigned long reservedpages = 0, codesize, initsize, datasize, bsssize;
> -
> #ifdef CONFIG_SWIOTLB
> swiotlb_init(0);
> #endif
>
> - num_physpages = memblock_phys_mem_size() >> PAGE_SHIFT;
> high_memory = (void *) __va(max_low_pfn * PAGE_SIZE);
>
> #ifdef CONFIG_NEED_MULTIPLE_NODES
> - for_each_online_node(nid) {
> - if (NODE_DATA(nid)->node_spanned_pages != 0) {
> - printk("freeing bootmem node %d\n", nid);
> - free_all_bootmem_node(NODE_DATA(nid));
> - }
> + {
> + pg_data_t *pgdat;
> +
> + for_each_online_pgdat(pgdat)
> + if (pgdat->node_spanned_pages != 0) {
> + printk("freeing bootmem node %d\n",
> + pgdat->node_id);
> + free_all_bootmem_node(pgdat);
> + }
> }
> #else
> max_mapnr = max_pfn;
> free_all_bootmem();
> #endif
> - for_each_online_pgdat(pgdat) {
> - for (i = 0; i < pgdat->node_spanned_pages; i++) {
> - if (!pfn_valid(pgdat->node_start_pfn + i))
> - continue;
> - page = pgdat_page_nr(pgdat, i);
> - if (PageReserved(page))
> - reservedpages++;
> - }
> - }
> -
> - codesize = (unsigned long)&_sdata - (unsigned long)&_stext;
> - datasize = (unsigned long)&_edata - (unsigned long)&_sdata;
> - initsize = (unsigned long)&__init_end - (unsigned long)&__init_begin;
> - bsssize = (unsigned long)&__bss_stop - (unsigned long)&__bss_start;
>
> #ifdef CONFIG_HIGHMEM
> {
> @@ -348,13 +329,9 @@ void __init mem_init(void)
> for (pfn = highmem_mapnr; pfn < max_mapnr; ++pfn) {
> phys_addr_t paddr = (phys_addr_t)pfn << PAGE_SHIFT;
> struct page *page = pfn_to_page(pfn);
> - if (memblock_is_reserved(paddr))
> - continue;
> - free_highmem_page(page);
> - reservedpages--;
> + if (!memblock_is_reserved(paddr))
> + free_highmem_page(page);
> }
> - printk(KERN_DEBUG "High memory: %luk\n",
> - totalhigh_pages << (PAGE_SHIFT-10));
> }
> #endif /* CONFIG_HIGHMEM */
>
> @@ -367,16 +344,7 @@ void __init mem_init(void)
> (mfspr(SPRN_TLB1CFG) & TLBnCFG_N_ENTRY) - 1;
> #endif
>
> - printk(KERN_INFO "Memory: %luk/%luk available (%luk kernel code, "
> - "%luk reserved, %luk data, %luk bss, %luk init)\n",
> - nr_free_pages() << (PAGE_SHIFT-10),
> - num_physpages << (PAGE_SHIFT-10),
> - codesize >> 10,
> - reservedpages << (PAGE_SHIFT-10),
> - datasize >> 10,
> - bsssize >> 10,
> - initsize >> 10);
> -
> + mem_init_print_info(NULL);
> #ifdef CONFIG_PPC32
> pr_info("Kernel virtual memory layout:\n");
> pr_info(" * 0x%08lx..0x%08lx : fixmap\n", FIXADDR_START, FIXADDR_TOP);
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