linux-kernel - [RFC PATCH v3 0/7] powerpc: Switch to CONFIG_THREAD_INFO_IN

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Date:   Mon,  1 Oct 2018 12:30:17 +0000 (UTC)
From:   Christophe Leroy <christophe.leroy@....fr>
To:     Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        aneesh.kumar@...ux.vnet.ibm.com, npiggin@...il.com
Cc:     linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org
Subject: [RFC PATCH v3 0/7] powerpc: Switch to CONFIG_THREAD_INFO_IN_TASK

The purpose of this serie is to activate CONFIG_THREAD_INFO_IN_TASK which
moves the thread_info into task_struct.

Moving thread_info into task_struct has the following advantages:
- It protects thread_info from corruption in the case of stack
overflows.
- Its address is harder to determine if stack addresses are
leaked, making a number of attacks more difficult.

Changes since RFC v2:
 - Removed the modification of names in asm-offsets
 - Created a rule in arch/powerpc/Makefile to append the offset of current->cpu in CFLAGS
 - Modified asm/smp.h to use the offset set in CFLAGS
 - Squashed the renaming of THREAD_INFO to TASK_STACK in the preparation patch
 - Moved the modification of current_pt_regs in the patch activating CONFIG_THREAD_INFO_IN_TASK

Changes since RFC v1:
 - Removed the first patch which was modifying header inclusion order in timer
 - Modified some names in asm-offsets to avoid conflicts when including asm-offsets in C files
 - Modified asm/smp.h to avoid having to include linux/sched.h (using asm-offsets instead)
 - Moved some changes from the activation patch to the preparation patch.

Christophe Leroy (7):
  book3s/64: avoid circular header inclusion in mmu-hash.h
  powerpc: Prepare for moving thread_info into task_struct
  powerpc: Activate CONFIG_THREAD_INFO_IN_TASK
  powerpc: regain entire stack space
  powerpc: 'current_set' is now a table of task_struct pointers
  powerpc/32: Remove CURRENT_THREAD_INFO and rename TI_CPU
  powerpc/64: Modify CURRENT_THREAD_INFO()

 arch/powerpc/Kconfig                           |  1 +
 arch/powerpc/Makefile                          |  6 +++
 arch/powerpc/include/asm/asm-prototypes.h      |  4 +-
 arch/powerpc/include/asm/book3s/64/mmu-hash.h  |  2 +-
 arch/powerpc/include/asm/exception-64s.h       |  4 +-
 arch/powerpc/include/asm/irq.h                 | 14 +++---
 arch/powerpc/include/asm/livepatch.h           |  2 +-
 arch/powerpc/include/asm/processor.h           | 39 ++-------------
 arch/powerpc/include/asm/ptrace.h              |  2 +-
 arch/powerpc/include/asm/reg.h                 |  2 +-
 arch/powerpc/include/asm/smp.h                 |  8 +++-
 arch/powerpc/include/asm/task_size.h           | 42 ++++++++++++++++
 arch/powerpc/include/asm/thread_info.h         | 17 +------
 arch/powerpc/kernel/asm-offsets.c              |  8 ++--
 arch/powerpc/kernel/entry_32.S                 | 66 +++++++++-----------------
 arch/powerpc/kernel/entry_64.S                 | 12 ++---
 arch/powerpc/kernel/epapr_hcalls.S             |  5 +-
 arch/powerpc/kernel/exceptions-64e.S           | 13 +----
 arch/powerpc/kernel/exceptions-64s.S           |  2 +-
 arch/powerpc/kernel/head_32.S                  | 14 +++---
 arch/powerpc/kernel/head_40x.S                 |  4 +-
 arch/powerpc/kernel/head_44x.S                 |  8 ++--
 arch/powerpc/kernel/head_64.S                  |  1 +
 arch/powerpc/kernel/head_8xx.S                 |  2 +-
 arch/powerpc/kernel/head_booke.h               | 12 ++---
 arch/powerpc/kernel/head_fsl_booke.S           | 16 +++----
 arch/powerpc/kernel/idle_6xx.S                 |  8 ++--
 arch/powerpc/kernel/idle_book3e.S              |  2 +-
 arch/powerpc/kernel/idle_e500.S                |  8 ++--
 arch/powerpc/kernel/idle_power4.S              |  2 +-
 arch/powerpc/kernel/irq.c                      | 66 ++++----------------------
 arch/powerpc/kernel/kgdb.c                     | 28 -----------
 arch/powerpc/kernel/machine_kexec_64.c         |  6 +--
 arch/powerpc/kernel/misc_32.S                  | 17 +++----
 arch/powerpc/kernel/process.c                  | 15 +++---
 arch/powerpc/kernel/setup-common.c             |  2 +-
 arch/powerpc/kernel/setup_32.c                 | 15 ++----
 arch/powerpc/kernel/setup_64.c                 | 29 ++---------
 arch/powerpc/kernel/smp.c                      | 16 +++----
 arch/powerpc/kernel/trace/ftrace_64_mprofile.S |  6 +--
 arch/powerpc/kvm/book3s_hv_hmi.c               |  1 +
 arch/powerpc/mm/hash_low_32.S                  | 14 ++----
 arch/powerpc/sysdev/6xx-suspend.S              |  5 +-
 arch/powerpc/xmon/xmon.c                       |  2 +-
 44 files changed, 203 insertions(+), 345 deletions(-)
 create mode 100644 arch/powerpc/include/asm/task_size.h

-- 
2.13.3