On Fri, 2013-06-14 at 17:56 -0700, Yinghai Lu wrote:
> Now we have arch_pfn_mapped array, and max_low_pfn_mapped should not
> be used anymore.
Can you describe why max_low_pfn_mapped should not be used? Is this to
allow moving the code of acpi_initrd_override() up before
init_mem_mapping() in a succeeding patch, or is there also another
reason behind it? Also, I think arch_pfn_mapped should be pfn_mapped[].
Thanks,
-Toshi
> User should use arch_pfn_mapped or just 1UL<<(32-PAGE_SHIFT) instead.
>
> Only user is ACPI_INITRD_TABLE_OVERRIDE, and it should not use that,
> as later accessing is using early_ioremap(). We could change to use
> 1U<<(32_PAGE_SHIFT) with it, aka under 4G.
>
> -v2: Leave alone max_low_pfn_mapped in i915 code according to tj.
>
> Suggested-by: H. Peter Anvin <h...@zytor.com>
> Signed-off-by: Yinghai Lu <ying...@kernel.org>
> Cc: "Rafael J. Wysocki" <r...@sisk.pl>
> Cc: Jacob Shin <jacob.s...@amd.com>
> Cc: Pekka Enberg <penb...@kernel.org>
> Cc: linux-a...@vger.kernel.org
> Tested-by: Thomas Renninger <tr...@suse.de>
> Reviewed-by: Tang Chen <tangc...@cn.fujitsu.com>
> Tested-by: Tang Chen <tangc...@cn.fujitsu.com>
> ---
> arch/x86/include/asm/page_types.h | 1 -
> arch/x86/kernel/setup.c | 4 +---
> arch/x86/mm/init.c | 4 ----
> drivers/acpi/osl.c | 6 +++---
> 4 files changed, 4 insertions(+), 11 deletions(-)
>
> diff --git a/arch/x86/include/asm/page_types.h
> b/arch/x86/include/asm/page_types.h
> index 54c9787..b012b82 100644
> --- a/arch/x86/include/asm/page_types.h
> +++ b/arch/x86/include/asm/page_types.h
> @@ -43,7 +43,6 @@
>
> extern int devmem_is_allowed(unsigned long pagenr);
>
> -extern unsigned long max_low_pfn_mapped;
> extern unsigned long max_pfn_mapped;
>
> static inline phys_addr_t get_max_mapped(void)
> diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c
> index 66ab495..6ca5f2c 100644
> --- a/arch/x86/kernel/setup.c
> +++ b/arch/x86/kernel/setup.c
> @@ -112,13 +112,11 @@
> #include <asm/prom.h>
>
> /*
> - * max_low_pfn_mapped: highest direct mapped pfn under 4GB
> - * max_pfn_mapped: highest direct mapped pfn over 4GB
> + * max_pfn_mapped: highest direct mapped pfn
> *
> * The direct mapping only covers E820_RAM regions, so the ranges and gaps
> are
> * represented by pfn_mapped
> */
> -unsigned long max_low_pfn_mapped;
> unsigned long max_pfn_mapped;
>
> #ifdef CONFIG_DMI
> diff --git a/arch/x86/mm/init.c b/arch/x86/mm/init.c
> index eaac174..8554656 100644
> --- a/arch/x86/mm/init.c
> +++ b/arch/x86/mm/init.c
> @@ -313,10 +313,6 @@ static void add_pfn_range_mapped(unsigned long
> start_pfn, unsigned long end_pfn)
> nr_pfn_mapped = clean_sort_range(pfn_mapped, E820_X_MAX);
>
> max_pfn_mapped = max(max_pfn_mapped, end_pfn);
> -
> - if (start_pfn < (1UL<<(32-PAGE_SHIFT)))
> - max_low_pfn_mapped = max(max_low_pfn_mapped,
> - min(end_pfn, 1UL<<(32-PAGE_SHIFT)));
> }
>
> bool pfn_range_is_mapped(unsigned long start_pfn, unsigned long end_pfn)
> diff --git a/drivers/acpi/osl.c b/drivers/acpi/osl.c
> index e721863..93e3194 100644
> --- a/drivers/acpi/osl.c
> +++ b/drivers/acpi/osl.c
> @@ -624,9 +624,9 @@ void __init acpi_initrd_override(void *data, size_t size)
> if (table_nr == 0)
> return;
>
> - acpi_tables_addr =
> - memblock_find_in_range(0, max_low_pfn_mapped << PAGE_SHIFT,
> - all_tables_size, PAGE_SIZE);
> + /* under 4G at first, then above 4G */
> + acpi_tables_addr = memblock_find_in_range(0, (1ULL<<32) - 1,
> + all_tables_size, PAGE_SIZE);
> if (!acpi_tables_addr) {
> WARN_ON(1);
> return;
--
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