linux-kernel - [PATCH v3 0/3] powerpc/mm: Fix kernel protection and implement CONFIG_DEBUG

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Date:   Mon, 24 Apr 2017 15:48:33 +0200
From:   Christophe Leroy <christophe.leroy@....fr>
To:     Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        Scott Wood <oss@...error.net>
Cc:     linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org
Subject: [PATCH v3 0/3] powerpc/mm: Fix kernel protection and implement CONFIG_DEBUG_RODATA on PPC32

This patch set implements CONFIG_DEBUG_RODATA on Powerpc32
after fixing a few issues related to kernel code page protection.

Changes in v2:
  Instead of making the entire kernel RW to patch code in ftrace,
  we now only change the rights on the page to be modified

Changes in v3:
  Changing the rights is performed in patch_instruction() instead of
  being done only in ftrace, so that other functionnalities like
  jump_label also works.

Christophe Leroy (3):
  powerpc/mm: Ensure change_page_attr() doesn't invalidate pinned TLBs
  powerpc/mm: Fix kernel RAM protection after freeing unused memory on
    PPC32
  powerpc/mm: Implement CONFIG_DEBUG_RODATA on PPC32

 arch/powerpc/Kconfig.debug         | 11 ++++++
 arch/powerpc/include/asm/pgtable.h |  8 +++++
 arch/powerpc/lib/code-patching.c   |  9 +++++
 arch/powerpc/mm/init_32.c          |  3 +-
 arch/powerpc/mm/mem.c              |  1 +
 arch/powerpc/mm/mmu_decl.h         |  3 ++
 arch/powerpc/mm/pgtable_32.c       | 69 ++++++++++++++++++++++++++++++++++----
 7 files changed, 96 insertions(+), 8 deletions(-)

-- 
2.12.0