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SubjectRe: [PATCHv2 05/19] ia64: expose number of page table levels on Kconfig level
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On Sat, 2015-01-31 at 02:17 +0200, Kirill A. Shutemov wrote:
> We would want to use number of page table level to define mm_struct.
> Let's expose it as CONFIG_PGTABLE_LEVELS.
>
> We need to define PGTABLE_LEVELS before sourcing init/Kconfig:
> arch/Kconfig will define default value and it's sourced from init/Kconfig.
>
> Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
> Cc: Tony Luck <tony.luck@intel.com>
> Cc: Fenghua Yu <fenghua.yu@intel.com>
> ---
> v2: fix default for IA64_PAGE_SIZE_64KB
> ---
> arch/ia64/Kconfig | 18 +++++-------------
> arch/ia64/include/asm/page.h | 4 ++--
> arch/ia64/include/asm/pgalloc.h | 4 ++--
> arch/ia64/include/asm/pgtable.h | 12 ++++++------
> arch/ia64/kernel/ivt.S | 12 ++++++------
> arch/ia64/kernel/machine_kexec.c | 4 ++--
> 6 files changed, 23 insertions(+), 31 deletions(-)
>
> diff --git a/arch/ia64/Kconfig b/arch/ia64/Kconfig
> index 074e52bf815c..4f9a6661491b 100644
> --- a/arch/ia64/Kconfig
> +++ b/arch/ia64/Kconfig
> @@ -1,3 +1,8 @@
> +config PGTABLE_LEVELS
> + int "Page Table Levels" if !IA64_PAGE_SIZE_64KB
> + range 3 4 if !IA64_PAGE_SIZE_64KB
> + default 3
> +

Why didn't you choose to make this something like
config PGTABLE_LEVELS
int
default 3 if PGTABLE_3
default 4 if PGTABLE_4

> source "init/Kconfig"
>
> source "kernel/Kconfig.freezer"
> @@ -286,19 +291,6 @@ config IA64_PAGE_SIZE_64KB
>
> endchoice
>
> -choice
> - prompt "Page Table Levels"
> - default PGTABLE_3
> -
> -config PGTABLE_3
> - bool "3 Levels"
> -
> -config PGTABLE_4
> - depends on !IA64_PAGE_SIZE_64KB
> - bool "4 Levels"
> -
> -endchoice
> -
> if IA64_HP_SIM
> config HZ
> default 32

... and drop this hunk (ie, keep this choice as it is)? That would make
upgrading to a release that uses PGTABLE_LEVELS do the right thing
automagically, wouldn't it? As currently in the !IA64_PAGE_SIZE_64KB
case people need to reconfigure their "Page Table Levels".


Paul Bolle



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