On Mon, Dec 22, 2014 at 10:59:03AM +0000, Ard Biesheuvel wrote: > Now that we are calling SetVirtualAddressMap() from the stub, there is no > need to reserve boot-only memory regions, which implies that there is also > no reason to free them again later. > > Signed-off-by: Ard Biesheuvel <[email protected]> > --- > arch/arm64/kernel/efi.c | 123 > +----------------------------------------------- > 1 file changed, 1 insertion(+), 122 deletions(-) > > diff --git a/arch/arm64/kernel/efi.c b/arch/arm64/kernel/efi.c > index 2ebe67ffb629..e969c5076713 100644 > --- a/arch/arm64/kernel/efi.c > +++ b/arch/arm64/kernel/efi.c > @@ -198,9 +198,7 @@ static __init void reserve_regions(void) > if (is_normal_ram(md)) > early_init_dt_add_memory_arch(paddr, size); > > - if (is_reserve_region(md) || > - md->type == EFI_BOOT_SERVICES_CODE || > - md->type == EFI_BOOT_SERVICES_DATA) { > + if (is_reserve_region(md)) { > memblock_reserve(paddr, size); > if (uefi_debug) > pr_cont("*"); > @@ -213,123 +211,6 @@ static __init void reserve_regions(void) > set_bit(EFI_MEMMAP, &efi.flags); > } > > - > -static u64 __init free_one_region(u64 start, u64 end) > -{ > - u64 size = end - start; > - > - if (uefi_debug) > - pr_info(" EFI freeing: 0x%012llx-0x%012llx\n", start, end - 1); > - > - free_bootmem_late(start, size); > - return size; > -} > - > -static u64 __init free_region(u64 start, u64 end) > -{ > - u64 map_start, map_end, total = 0; > - > - if (end <= start) > - return total; > - > - map_start = (u64)memmap.phys_map; > - map_end = PAGE_ALIGN(map_start + (memmap.map_end - memmap.map)); > - map_start &= PAGE_MASK; > - > - if (start < map_end && end > map_start) { > - /* region overlaps UEFI memmap */ > - if (start < map_start) > - total += free_one_region(start, map_start); > - > - if (map_end < end) > - total += free_one_region(map_end, end); > - } else > - total += free_one_region(start, end); > - > - return total; > -} > - > -static void __init free_boot_services(void) > -{ > - u64 total_freed = 0; > - u64 keep_end, free_start, free_end; > - efi_memory_desc_t *md; > - > - /* > - * If kernel uses larger pages than UEFI, we have to be careful > - * not to inadvertantly free memory we want to keep if there is > - * overlap at the kernel page size alignment. We do not want to > - * free is_reserve_region() memory nor the UEFI memmap itself. > - * > - * The memory map is sorted, so we keep track of the end of > - * any previous region we want to keep, remember any region > - * we want to free and defer freeing it until we encounter > - * the next region we want to keep. This way, before freeing > - * it, we can clip it as needed to avoid freeing memory we > - * want to keep for UEFI. > - */ > - > - keep_end = 0; > - free_start = 0; > - > - for_each_efi_memory_desc(&memmap, md) { > - u64 paddr, npages, size; > - > - if (is_reserve_region(md)) { > - /* > - * We don't want to free any memory from this region. > - */ > - if (free_start) { > - /* adjust free_end then free region */ > - if (free_end > md->phys_addr) > - free_end -= PAGE_SIZE; > - total_freed += free_region(free_start, > free_end); > - free_start = 0; > - } > - keep_end = md->phys_addr + (md->num_pages << > EFI_PAGE_SHIFT); > - continue; > - } > - > - if (md->type != EFI_BOOT_SERVICES_CODE && > - md->type != EFI_BOOT_SERVICES_DATA) { > - /* no need to free this region */ > - continue; > - } > - > - /* > - * We want to free memory from this region. > - */ > - paddr = md->phys_addr; > - npages = md->num_pages; > - memrange_efi_to_native(&paddr, &npages); > - size = npages << PAGE_SHIFT; > - > - if (free_start) { > - if (paddr <= free_end) > - free_end = paddr + size; > - else { > - total_freed += free_region(free_start, > free_end); > - free_start = paddr; > - free_end = paddr + size; > - } > - } else { > - free_start = paddr; > - free_end = paddr + size; > - } > - if (free_start < keep_end) { > - free_start += PAGE_SIZE; > - if (free_start >= free_end) > - free_start = 0; > - } > - } > - if (free_start) > - total_freed += free_region(free_start, free_end); > - > - if (total_freed) > - pr_info("Freed 0x%llx bytes of EFI boot services memory", > - total_freed); > -} > - > void __init efi_init(void) > { > struct efi_fdt_params params; > @@ -396,8 +277,6 @@ static int __init arm64_enter_virtual_mode(void) > } > set_bit(EFI_SYSTEM_TABLES, &efi.flags); > > - free_boot_services(); > - > if (!efi_enabled(EFI_VIRTMAP)) { > pr_err("No UEFI virtual mapping was installed -- runtime > services will not be available\n"); > return -1; > -- > 1.8.3.2
Acked-by: Leif Lindholm <[email protected]> -- To unsubscribe from this list: send the line "unsubscribe linux-efi" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
