Re: [PATCH v2 0/5] Allocate module text and data separately

[Miroslav Benes]

On Thu, 27 Jan 2022, Christophe Leroy wrote:

> This series allow architectures to request having modules data in
> vmalloc area instead of module area.
> 
> This is required on powerpc book3s/32 in order to set data non
> executable, because it is not possible to set executability on page
> basis, this is done per 256 Mbytes segments. The module area has exec
> right, vmalloc area has noexec. Without this change module data
> remains executable regardless of CONFIG_STRICT_MODULES_RWX.
> 
> This can also be useful on other powerpc/32 in order to maximize the
> chance of code being close enough to kernel core to avoid branch
> trampolines.
> 
> Changes in v2:
> - Dropped first two patches which are not necessary. They may be added back later as a follow-up series.
> - Fixed the printks in GDB
> 
> Christophe Leroy (5):
>   modules: Always have struct mod_tree_root
>   modules: Prepare for handling several RB trees
>   modules: Introduce data_layout
>   modules: Add CONFIG_ARCH_WANTS_MODULES_DATA_IN_VMALLOC
>   powerpc: Select ARCH_WANTS_MODULES_DATA_IN_VMALLOC on book3s/32 and
>     8xx
> 
>  arch/Kconfig                |   6 ++
>  arch/powerpc/Kconfig        |   1 +
>  include/linux/module.h      |   8 ++
>  kernel/debug/kdb/kdb_main.c |  10 +-
>  kernel/module.c             | 193 +++++++++++++++++++++++++-----------
>  5 files changed, 156 insertions(+), 62 deletions(-)

Looks good to me apart from the typo I mentioned at v1. I will review 
again once it is rebased on Aaron's patch set.

Regards,
Miroslav