diff options
| author | Johannes Berg <johannes@sipsolutions.net> | 2007-05-08 19:25:00 +1000 |
|---|---|---|
| committer | Paul Mackerras <paulus@samba.org> | 2007-05-09 16:34:56 +1000 |
| commit | 4e8ad3e816cca76ff8550e531103fc5e20471654 (patch) | |
| tree | b532e3419526d1aaa5ace5955c92a61ba2259499 /arch/powerpc/mm/mem.c | |
| parent | 940d67f6b95166475ff6e600ef7658e1cd441278 (diff) | |
| download | linux-rt-4e8ad3e816cca76ff8550e531103fc5e20471654.tar.gz | |
[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 <johannes@sipsolutions.net>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>
Diffstat (limited to 'arch/powerpc/mm/mem.c')
| -rw-r--r-- | arch/powerpc/mm/mem.c | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/arch/powerpc/mm/mem.c b/arch/powerpc/mm/mem.c index 1a6e08f3298f..246eeea40ece 100644 --- a/arch/powerpc/mm/mem.c +++ b/arch/powerpc/mm/mem.c @@ -31,6 +31,7 @@ #include <linux/highmem.h> #include <linux/initrd.h> #include <linux/pagemap.h> +#include <linux/suspend.h> #include <asm/pgalloc.h> #include <asm/prom.h> @@ -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 */ |