diff options
Diffstat (limited to 'arch/arm/mm/init.c')
| -rw-r--r-- | arch/arm/mm/init.c | 37 |
1 files changed, 25 insertions, 12 deletions
diff --git a/arch/arm/mm/init.c b/arch/arm/mm/init.c index 5a3641b5ec2c..ff2cd985d20e 100644 --- a/arch/arm/mm/init.c +++ b/arch/arm/mm/init.c @@ -176,11 +176,22 @@ static void __init zone_sizes_init(unsigned long min, unsigned long max_low, int pfn_valid(unsigned long pfn) { phys_addr_t addr = __pfn_to_phys(pfn); + unsigned long pageblock_size = PAGE_SIZE * pageblock_nr_pages; if (__phys_to_pfn(addr) != pfn) return 0; - return memblock_is_map_memory(__pfn_to_phys(pfn)); + /* + * If address less than pageblock_size bytes away from a present + * memory chunk there still will be a memory map entry for it + * because we round freed memory map to the pageblock boundaries. + */ + if (memblock_overlaps_region(&memblock.memory, + ALIGN_DOWN(addr, pageblock_size), + pageblock_size)) + return 1; + + return 0; } EXPORT_SYMBOL(pfn_valid); #endif @@ -371,14 +382,14 @@ static void __init free_unused_memmap(void) */ start = min(start, ALIGN(prev_end, PAGES_PER_SECTION)); -#else +#endif /* - * Align down here since the VM subsystem insists that the - * memmap entries are valid from the bank start aligned to - * MAX_ORDER_NR_PAGES. + * Align down here since many operations in VM subsystem + * presume that there are no holes in the memory map inside + * a pageblock */ - start = round_down(start, MAX_ORDER_NR_PAGES); -#endif + start = round_down(start, pageblock_nr_pages); + /* * If we had a previous bank, and there is a space * between the current bank and the previous, free it. @@ -387,18 +398,20 @@ static void __init free_unused_memmap(void) free_memmap(prev_end, start); /* - * Align up here since the VM subsystem insists that the - * memmap entries are valid from the bank end aligned to - * MAX_ORDER_NR_PAGES. + * Align up here since many operations in VM subsystem + * presume that there are no holes in the memory map inside + * a pageblock */ prev_end = ALIGN(memblock_region_memory_end_pfn(reg), - MAX_ORDER_NR_PAGES); + pageblock_nr_pages); } #ifdef CONFIG_SPARSEMEM - if (!IS_ALIGNED(prev_end, PAGES_PER_SECTION)) + if (!IS_ALIGNED(prev_end, PAGES_PER_SECTION)) { + prev_end = ALIGN(prev_end, pageblock_nr_pages); free_memmap(prev_end, ALIGN(prev_end, PAGES_PER_SECTION)); + } #endif } |