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From:   Christophe Leroy <christophe.leroy@csgroup.eu>
To:     Luis Chamberlain <mcgrof@kernel.org>, Jessica Yu <jeyu@kernel.org>
CC:     Christophe Leroy <christophe.leroy@csgroup.eu>,
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        "linux-mm@kvack.org" <linux-mm@kvack.org>,
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Subject: [PATCH v2 0/5] Allocate module text and data separately
Thread-Topic: [PATCH v2 0/5] Allocate module text and data separately
Thread-Index: AQHYE3Du95G6zDF79UWzRpf5PWe+tA==
Date:   Thu, 27 Jan 2022 11:27:56 +0000
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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(-)

-- 
2.33.1