From: Johannes Berg Date: Tue, 8 May 2007 09:25:00 +0000 (+1000) Subject: [POWERPC] Mark pages that don't exist as nosave X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=4e8ad3e816cca76ff8550e531103fc5e20471654;p=GitHub%2FLineageOS%2Fandroid_kernel_samsung_universal7580.git [POWERPC] Mark pages that don't exist as nosave On some powerpc architectures (notably 64-bit powermac) there is a memory hole, for example on powermacs between 2G and 4G. Since we use the flat memory model regardless, these pages must be marked as nosave (for suspend to disk.) Signed-off-by: Johannes Berg Cc: Benjamin Herrenschmidt Signed-off-by: Paul Mackerras --- diff --git a/arch/powerpc/mm/mem.c b/arch/powerpc/mm/mem.c index 1a6e08f3298..246eeea40ec 100644 --- a/arch/powerpc/mm/mem.c +++ b/arch/powerpc/mm/mem.c @@ -31,6 +31,7 @@ #include #include #include +#include #include #include @@ -276,6 +277,28 @@ void __init do_init_bootmem(void) init_bootmem_done = 1; } +/* mark pages that don't exist as nosave */ +static int __init mark_nonram_nosave(void) +{ + unsigned long lmb_next_region_start_pfn, + lmb_region_max_pfn; + int i; + + for (i = 0; i < lmb.memory.cnt - 1; i++) { + lmb_region_max_pfn = + (lmb.memory.region[i].base >> PAGE_SHIFT) + + (lmb.memory.region[i].size >> PAGE_SHIFT); + lmb_next_region_start_pfn = + lmb.memory.region[i+1].base >> PAGE_SHIFT; + + if (lmb_region_max_pfn < lmb_next_region_start_pfn) + register_nosave_region(lmb_region_max_pfn, + lmb_next_region_start_pfn); + } + + return 0; +} + /* * paging_init() sets up the page tables - in fact we've already done this. */ @@ -307,6 +330,8 @@ void __init paging_init(void) max_zone_pfns[ZONE_DMA] = top_of_ram >> PAGE_SHIFT; #endif free_area_init_nodes(max_zone_pfns); + + mark_nonram_nosave(); } #endif /* ! CONFIG_NEED_MULTIPLE_NODES */