Re: [RFC PATCH 24/29] memblock: replace free_bootmem_late with memblock_free_late

Michal Hocko
2018-09-06T09:02:42Z

On Wed 05-09-18 18:59:39, Mike Rapoport wrote:
> The free_bootmem_late and memblock_free_late do exactly the same thing:
> they iterate over a range and give pages to the page allocator.
>
> Replace calls to free_bootmem_late with calls to memblock_free_late and
> remove the bootmem variant.
>
> Signed-off-by: Mike Rapoport <rppt@linux.vnet.ibm.com>

Acked-by: Michal Hocko <mhocko@suse.com>

> ---
> arch/sparc/kernel/mdesc.c | 3 ++-
> arch/x86/platform/efi/quirks.c | 6 +++---
> drivers/firmware/efi/apple-properties.c | 2 +-
> include/linux/bootmem.h | 2 --
> mm/nobootmem.c | 24 ------------------------
> 5 files changed, 6 insertions(+), 31 deletions(-)
>
> diff --git a/arch/sparc/kernel/mdesc.c b/arch/sparc/kernel/mdesc.c
> index 59131e7..a41526b 100644
> --- a/arch/sparc/kernel/mdesc.c
> +++ b/arch/sparc/kernel/mdesc.c
> @@ -12,6 +12,7 @@
> #include <linux/mm.h>
> #include <linux/miscdevice.h>
> #include <linux/bootmem.h>
> +#include <linux/memblock.h>
> #include <linux/export.h>
> #include <linux/refcount.h>
>
> @@ -190,7 +191,7 @@ static void __init mdesc_memblock_free(struct mdesc_handle *hp)
>
> alloc_size = PAGE_ALIGN(hp->handle_size);
> start = __pa(hp);
> - free_bootmem_late(start, alloc_size);
> + memblock_free_late(start, alloc_size);
> }
>
> static struct mdesc_mem_ops memblock_mdesc_ops = {
> diff --git a/arch/x86/platform/efi/quirks.c b/arch/x86/platform/efi/quirks.c
> index 844d31c..7b4854c 100644
> --- a/arch/x86/platform/efi/quirks.c
> +++ b/arch/x86/platform/efi/quirks.c
> @@ -332,7 +332,7 @@ void __init efi_reserve_boot_services(void)
>
> /*
> * Because the following memblock_reserve() is paired
> - * with free_bootmem_late() for this region in
> + * with memblock_free_late() for this region in
> * efi_free_boot_services(), we must be extremely
> * careful not to reserve, and subsequently free,
> * critical regions of memory (like the kernel image) or
> @@ -363,7 +363,7 @@ void __init efi_reserve_boot_services(void)
> * doesn't make sense as far as the firmware is
> * concerned, but it does provide us with a way to tag
> * those regions that must not be paired with
> - * free_bootmem_late().
> + * memblock_free_late().
> */
> md->attribute |= EFI_MEMORY_RUNTIME;
> }
> @@ -413,7 +413,7 @@ void __init efi_free_boot_services(void)
> size -= rm_size;
> }
>
> - free_bootmem_late(start, size);
> + memblock_free_late(start, size);
> }
>
> if (!num_entries)
> diff --git a/drivers/firmware/efi/apple-properties.c b/drivers/firmware/efi/apple-properties.c
> index 60a9571..2b675f7 100644
> --- a/drivers/firmware/efi/apple-properties.c
> +++ b/drivers/firmware/efi/apple-properties.c
> @@ -235,7 +235,7 @@ static int __init map_properties(void)
> */
> data->len = 0;
> memunmap(data);
> - free_bootmem_late(pa_data + sizeof(*data), data_len);
> + memblock_free_late(pa_data + sizeof(*data), data_len);
>
> return ret;
> }
> diff --git a/include/linux/bootmem.h b/include/linux/bootmem.h
> index 706cf8e..bcc7e2f 100644
> --- a/include/linux/bootmem.h
> +++ b/include/linux/bootmem.h
> @@ -30,8 +30,6 @@ extern unsigned long free_all_bootmem(void);
> extern void reset_node_managed_pages(pg_data_t *pgdat);
> extern void reset_all_zones_managed_pages(void);
>
> -extern void free_bootmem_late(unsigned long physaddr, unsigned long size);
> -
> /* We are using top down, so it is safe to use 0 here */
> #define BOOTMEM_LOW_LIMIT 0
>
> diff --git a/mm/nobootmem.c b/mm/nobootmem.c
> index 85e1822..ee0f7fc 100644
> --- a/mm/nobootmem.c
> +++ b/mm/nobootmem.c
> @@ -33,30 +33,6 @@ unsigned long min_low_pfn;
> unsigned long max_pfn;
> unsigned long long max_possible_pfn;
>
> -/**
> - * free_bootmem_late - free bootmem pages directly to page allocator
> - * @addr: starting address of the range
> - * @size: size of the range in bytes
> - *
> - * This is only useful when the bootmem allocator has already been torn
> - * down, but we are still initializing the system. Pages are given directly
> - * to the page allocator, no bootmem metadata is updated because it is gone.
> - */
> -void __init free_bootmem_late(unsigned long addr, unsigned long size)
> -{
> - unsigned long cursor, end;
> -
> - kmemleak_free_part_phys(addr, size);
> -
> - cursor = PFN_UP(addr);
> - end = PFN_DOWN(addr + size);
> -
> - for (; cursor < end; cursor++) {
> - __free_pages_bootmem(pfn_to_page(cursor), cursor, 0);
> - totalram_pages++;
> - }
> -}
> -
> static void __init __free_pages_memory(unsigned long start, unsigned long end)
> {
> int order;
> --
> 2.7.4
>

--
Michal Hocko
SUSE Labs