diff options
Diffstat (limited to 'arch/arm/mm')
| -rw-r--r-- | arch/arm/mm/init.c | 19 | ||||
| -rw-r--r-- | arch/arm/mm/mmap.c | 4 |
2 files changed, 13 insertions, 10 deletions
diff --git a/arch/arm/mm/init.c b/arch/arm/mm/init.c index 240b68d511dc..7185b00650fe 100644 --- a/arch/arm/mm/init.c +++ b/arch/arm/mm/init.c @@ -398,28 +398,27 @@ static void __init free_unused_memmap(struct meminfo *mi) unsigned int i; /* - * [FIXME] This relies on each bank being in address order. This - * may not be the case, especially if the user has provided the - * information on the command line. + * This relies on each bank being in address order. + * The banks are sorted previously in bootmem_init(). */ for_each_bank(i, mi) { struct membank *bank = &mi->bank[i]; bank_start = bank_pfn_start(bank); - if (bank_start < prev_bank_end) { - printk(KERN_ERR "MEM: unordered memory banks. " - "Not freeing memmap.\n"); - break; - } /* * If we had a previous bank, and there is a space * between the current bank and the previous, free it. */ - if (prev_bank_end && prev_bank_end != bank_start) + if (prev_bank_end && prev_bank_end < bank_start) free_memmap(prev_bank_end, bank_start); - prev_bank_end = bank_pfn_end(bank); + /* + * Align up here since the VM subsystem insists that the + * memmap entries are valid from the bank end aligned to + * MAX_ORDER_NR_PAGES. + */ + prev_bank_end = ALIGN(bank_pfn_end(bank), MAX_ORDER_NR_PAGES); } } diff --git a/arch/arm/mm/mmap.c b/arch/arm/mm/mmap.c index f5abc51c5a07..4f5b39687df5 100644 --- a/arch/arm/mm/mmap.c +++ b/arch/arm/mm/mmap.c @@ -7,6 +7,7 @@ #include <linux/shm.h> #include <linux/sched.h> #include <linux/io.h> +#include <linux/random.h> #include <asm/cputype.h> #include <asm/system.h> @@ -80,6 +81,9 @@ arch_get_unmapped_area(struct file *filp, unsigned long addr, start_addr = addr = TASK_UNMAPPED_BASE; mm->cached_hole_size = 0; } + /* 8 bits of randomness in 20 address space bits */ + if (current->flags & PF_RANDOMIZE) + addr += (get_random_int() % (1 << 8)) << PAGE_SHIFT; full_search: if (do_align) |