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* [RFC 0/4] x86: keep TASK_SIZE in sync with mm->task_size
@ 2016-12-30 15:56 Dmitry Safonov
  2016-12-30 15:56 ` [RFC 1/4] mm: remove unused TASK_SIZE_OF() Dmitry Safonov
  0 siblings, 1 reply; 7+ messages in thread
From: Dmitry Safonov @ 2016-12-30 15:56 UTC (permalink / raw)
  To: linux-kernel
  Cc: 0x7f454c46, Dmitry Safonov, Thomas Gleixner, Ingo Molnar,
	H. Peter Anvin, Andy Lutomirski, Kirill A . Shutemov, x86,
	Catalin Marinas, Will Deacon, Ralf Baechle, James E.J. Bottomley,
	Helge Deller, Benjamin Herrenschmidt, Paul Mackerras,
	Michael Ellerman, Martin Schwidefsky, Heiko Carstens,
	David S. Miller, Peter Zijlstra

At this moment, we have following task_size-related things:
- TASK_SIZE_OF() macro, which is unused;
- current->mm->task_size which is used in half and TASK_SIZE() macro
  which is used in the other half of code
- TIF_ADDR32, which is used to detect 32-bit address space and is
  x86-specific, where some other arches misused TIF_32BIT
- personality ADDR_LIMIT_32BIT, which is used on arm/alpha
- ADDR_LIMIT_3GB, which is x86-specific and can be used to change
  running task's TASK_SIZE 3GB <-> 4GB

This patches set removes unused definition of TASK_SIZE_OF (1),
defines TASK_SIZE macro as current->mm->task_size (3).
I would suggest define TASK_SIZE this way in generic version,
but currently I test it only on x86.
It also frees thread info flag (2) and adds arch_prctl()
on x86_64 to get/set current virtual address space size - as
it's needed by now only for CRIU, hide it under CHECKPOINT_RESTORE
config.
Hope those patches will help to clean task_size-related code
at least a bit (and helps me to restore vaddr limits).

Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: x86@kernel.org

Dmitry Safonov (4):
  mm: remove unused TASK_SIZE_OF()
  x86/thread_info: kill TIF_ADDR32 in favour of ADDR_LIMIT_32BIT
  x86/mm: define TASK_SIZE as current->mm->task_size
  x86/arch_prctl: add ARCH_{GET,SET}_TASK_SIZE

 arch/arm64/include/asm/memory.h       |  2 --
 arch/mips/include/asm/processor.h     |  3 ---
 arch/parisc/include/asm/processor.h   |  3 +--
 arch/powerpc/include/asm/processor.h  |  3 +--
 arch/s390/include/asm/processor.h     |  3 +--
 arch/sparc/include/asm/processor_64.h |  3 ---
 arch/x86/include/asm/elf.h            |  7 +++++--
 arch/x86/include/asm/processor.h      | 19 +++++++++----------
 arch/x86/include/asm/thread_info.h    |  4 +---
 arch/x86/include/uapi/asm/prctl.h     |  3 +++
 arch/x86/kernel/process_64.c          | 17 +++++++++++++++--
 arch/x86/kernel/sys_x86_64.c          |  4 ++--
 arch/x86/um/asm/segment.h             |  2 +-
 arch/x86/xen/mmu.c                    |  4 ++--
 fs/exec.c                             | 17 +++++++++++------
 include/linux/sched.h                 |  4 ----
 16 files changed, 52 insertions(+), 46 deletions(-)

-- 
2.11.0

^ permalink raw reply	[flat|nested] 7+ messages in thread
end of thread, other threads:[~2017-01-05 17:54 UTC | newest]

Thread overview: 7+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2016-12-30 15:56 [RFC 0/4] x86: keep TASK_SIZE in sync with mm->task_size Dmitry Safonov
2016-12-30 15:56 ` [RFC 1/4] mm: remove unused TASK_SIZE_OF() Dmitry Safonov
2016-12-31  1:36   ` Andy Lutomirski
2017-01-02  6:57   ` Heiko Carstens
2017-01-02  9:53   ` Kirill A. Shutemov
2017-01-05  9:51   ` David Laight
2017-01-05 17:54     ` Andy Lutomirski

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