Re: [PATCH v2 00/15] init_mm: cleanup ARCH's text/data/brk setup code

[Mike Rapoport]

Hello Kefeng,

On Fri, Jun 04, 2021 at 03:06:18PM +0800, Kefeng Wang wrote:
> Add setup_initial_init_mm() helper, then use it
> to cleanup the text, data and brk setup code.
> 
> v2:
> - change argument from "char *" to "void *" setup_initial_init_mm()
>   suggested by Geert Uytterhoeven
> - use NULL instead of (void *)0 on h8300 and m68k
> - collect ACKs
> 
> Cc: linux-snps-arc@xxxxxxxxxxxxxxxxxxx
> Cc: linux-arm-kernel@xxxxxxxxxxxxxxxxxxx
> Cc: linux-csky@xxxxxxxxxxxxxxx
> Cc: uclinux-h8-devel@xxxxxxxxxxxxxxxxxxxx
> Cc: linux-m68k@xxxxxxxxxxxxxxxxxxxx
> Cc: openrisc@xxxxxxxxxxxxxxxxxxxx
> Cc: linuxppc-dev@xxxxxxxxxxxxxxxx
> Cc: linux-riscv@xxxxxxxxxxxxxxxxxxx
> Cc: linux-sh@xxxxxxxxxxxxxxx
> Cc: linux-s390@xxxxxxxxxxxxxxx
> Kefeng Wang (15):
>   mm: add setup_initial_init_mm() helper
>   arc: convert to setup_initial_init_mm()
>   arm: convert to setup_initial_init_mm()
>   arm64: convert to setup_initial_init_mm()
>   csky: convert to setup_initial_init_mm()
>   h8300: convert to setup_initial_init_mm()
>   m68k: convert to setup_initial_init_mm()
>   nds32: convert to setup_initial_init_mm()
>   nios2: convert to setup_initial_init_mm()
>   openrisc: convert to setup_initial_init_mm()
>   powerpc: convert to setup_initial_init_mm()
>   riscv: convert to setup_initial_init_mm()
>   s390: convert to setup_initial_init_mm()
>   sh: convert to setup_initial_init_mm()
>   x86: convert to setup_initial_init_mm()

I might be missing something, but AFAIU the init_mm.start_code and other
fields are not used really early so the new setup_initial_init_mm()
function can be called in the generic code outside setup_arch(), e.g in
mm_init().
 
>  arch/arc/mm/init.c                 | 5 +----
>  arch/arm/kernel/setup.c            | 5 +----
>  arch/arm64/kernel/setup.c          | 5 +----
>  arch/csky/kernel/setup.c           | 5 +----
>  arch/h8300/kernel/setup.c          | 5 +----
>  arch/m68k/kernel/setup_mm.c        | 5 +----
>  arch/m68k/kernel/setup_no.c        | 5 +----
>  arch/nds32/kernel/setup.c          | 5 +----
>  arch/nios2/kernel/setup.c          | 5 +----
>  arch/openrisc/kernel/setup.c       | 5 +----
>  arch/powerpc/kernel/setup-common.c | 5 +----
>  arch/riscv/kernel/setup.c          | 5 +----
>  arch/s390/kernel/setup.c           | 5 +----
>  arch/sh/kernel/setup.c             | 5 +----
>  arch/x86/kernel/setup.c            | 5 +----
>  include/linux/mm_types.h           | 8 ++++++++
>  16 files changed, 23 insertions(+), 60 deletions(-)
> 
> -- 
> 2.26.2
> 
> 
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-- 
Sincerely yours,
Mike.