linux-kernel - [PATCH 0/5] make *_gate_vma accept mm_struct instead of task

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Date:	Tue,  8 Mar 2011 19:31:56 -0500
From:	Stephen Wilson <wilsons@...rt.ca>
To:	x86@...nel.org
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Paul Mackerras <paulus@...ba.org>,
	Martin Schwidefsky <schwidefsky@...ibm.com>,
	Heiko Carstens <heiko.carstens@...ibm.com>,
	linux390@...ibm.com, Paul Mundt <lethal@...ux-sh.org>,
	Andi Kleen <ak@...ux.intel.com>,
	Michel Lespinasse <walken@...gle.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Alexander Viro <viro@...iv.linux.org.uk>,
	linuxppc-dev@...ts.ozlabs.org, linux-s390@...r.kernel.org,
	linux-sh@...r.kernel.org, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH 0/5] make *_gate_vma accept mm_struct instead of task_struct


Morally, the question of whether an address lies in a gate vma should be asked
with respect to an mm, not a particular task.

Practically, dropping the dependency on task_struct will help make current and
future operations on mm's more flexible and convenient.  In particular, it
allows some code paths to avoid the need to hold task_lock.

The only architecture this change impacts in any significant way is x86_64.
The principle change on that architecture is to mirror TIF_IA32 via
a new flag in mm_context_t. 

This is the first of a two part series that implements safe writes to
/proc/pid/mem.  I will be posting the second series to lkml shortly.  These
patches are based on v2.6.38-rc8.  The general approach used here was suggested
to me by Alexander Viro, but any mistakes present in these patches are entirely
my own.


--
steve


Stephen Wilson (5):
      x86: add context tag to mark mm when running a task in 32-bit compatibility mode
      x86: mark associated mm when running a task in 32 bit compatibility mode
      mm: arch: make get_gate_vma take an mm_struct instead of a task_struct
      mm: arch: make in_gate_area take an mm_struct instead of a task_struct
      mm: arch: rename in_gate_area_no_task to in_gate_area_no_mm


 arch/powerpc/kernel/vdso.c         |    6 +++---
 arch/s390/kernel/vdso.c            |    6 +++---
 arch/sh/kernel/vsyscall/vsyscall.c |    6 +++---
 arch/x86/ia32/ia32_aout.c          |    1 +
 arch/x86/include/asm/mmu.h         |    6 ++++++
 arch/x86/kernel/process_64.c       |    8 ++++++++
 arch/x86/mm/init_64.c              |   16 ++++++++--------
 arch/x86/vdso/vdso32-setup.c       |   15 ++++++++-------
 fs/binfmt_elf.c                    |    2 +-
 fs/proc/task_mmu.c                 |    8 +++++---
 include/linux/mm.h                 |   10 +++++-----
 kernel/kallsyms.c                  |    4 ++--
 mm/memory.c                        |    8 ++++----
 mm/mlock.c                         |    4 ++--
 mm/nommu.c                         |    2 +-
 15 files changed, 61 insertions(+), 42 deletions(-)



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