On Tuesday, August 27, 2013 05:37:45 PM Tang Chen wrote:
> The current acpi_initrd_override() calls memblock_find_in_range() to allocate
> memory, and pass 0 to %start, which will not limited by the current_limit_low.
>
> acpi_initrd_override()
> |->memblock_find_in_range(0, ...)
> |->memblock_find_in_range_node(0, ...)
>
> When we want to allocate memory from the end of kernel image to higher memory,
> we need to limit the lowest address to the end of kernel image.
>
> We have modified memblock_alloc_base_nid() to call
> memblock_find_in_range_node()
> with %start = MEMBLOCK_ALLOC_ACCESSIBLE, which means it will be limited by
> current_limit_low. And __memblock_alloc_base() calls
> memblock_alloc_base_nid().
>
> __memblock_alloc_base()
> |->memblock_alloc_base_nid()
> |->memblock_find_in_range_node(MEMBLOCK_ALLOC_ACCESSIBLE, ...)
>
> So use __memblock_alloc_base() to allocate memory in acpi_initrd_override().
>
> Signed-off-by: Tang Chen
> Reviewed-by: Zhang Yanfei
Looks OK to me.
Acked-by: Rafael J. Wysocki
> ---
> drivers/acpi/osl.c |4 ++--
> 1 files changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/acpi/osl.c b/drivers/acpi/osl.c
> index fece767..1d68fc0 100644
> --- a/drivers/acpi/osl.c
> +++ b/drivers/acpi/osl.c
> @@ -629,8 +629,8 @@ void __init acpi_initrd_override(void *data, size_t size)
> return;
>
> /* under 4G at first, then above 4G */
> - acpi_tables_addr = memblock_find_in_range(0, (1ULL<<32) - 1,
> - all_tables_size, PAGE_SIZE);
> + acpi_tables_addr = __memblock_alloc_base(all_tables_size,
> + PAGE_SIZE, (1ULL<<32) - 1);
> if (!acpi_tables_addr) {
> WARN_ON(1);
> return;
>
--
I speak only for myself.
Rafael J. Wysocki, Intel Open Source Technology Center.
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