Eric Lee / smarc-fsl-linux-kernel

02 Nov, 2011

2 commits

25 May, 2011

1 commit

22 Jun, 2009

1 commit

  • d06063cc2   Move FAULT_FLAG_xyz into handle_mm_fault() callers ... Browse Code »

    This allows the callers to now pass down the full set of FAULT_FLAG_xyz
    flags to handle_mm_fault(). All callers have been (mechanically)
    converted to the new calling convention, there's almost certainly room
    for architectures to clean up their code and then add FAULT_FLAG_RETRY
    when that support is added.

    Signed-off-by: Linus Torvalds

    Linus Torvalds
     

07 Jan, 2009

1 commit

  • 1c0fe6e3b   mm: invoke oom-killer from page fault ... Browse Code »

    Rather than have the pagefault handler kill a process directly if it gets
    a VM_FAULT_OOM, have it call into the OOM killer.

    With increasingly sophisticated oom behaviour (cpusets, memory cgroups,
    oom killing throttling, oom priority adjustment or selective disabling,
    panic on oom, etc), it's silly to unconditionally kill the faulting
    process at page fault time. Create a hook for pagefault oom path to call
    into instead.

    Only converted x86 and uml so far.

    [akpm@linux-foundation.org: make __out_of_memory() static]
    [akpm@linux-foundation.org: fix comment]
    Signed-off-by: Nick Piggin
    Cc: Jeff Dike
    Acked-by: Ingo Molnar
    Cc: Thomas Gleixner
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Nick Piggin
     

06 Feb, 2008

4 commits

  • 3e6f2ac48   uml: kill processes instead of panicing kernel ... Browse Code »

    UML was panicing in the case of failures of libc calls which shouldn't happen.
    This is an overreaction since a failure from libc doesn't normally mean that
    kernel data structures are in an unknown state. Instead, the current process
    should just be killed if there is no way to recover.

    The case that prompted this was a failure of PTRACE_SETREGS restoring the same
    state that was read by PTRACE_GETREGS. It appears that when a process tries
    to load a bogus value into a segment register, it segfaults (as expected) and
    the value is actually loaded and is seen by PTRACE_GETREGS (not expected).

    This case is fixed by forcing a fatal SIGSEGV on the process so that it
    immediately dies. fatal_sigsegv was added for this purpose. It was declared
    as noreturn, so in order to pursuade gcc that it actually does not return, I
    added a call to os_dump_core (and declared it noreturn) so that I get a core
    file if somehow the process survives.

    All other calls in arch/um/os-Linux/skas/process.c got the same treatment,
    with failures causing the process to die instead of a kernel panic, with some
    exceptions.

    userspace_tramp exits with status 1 if anything goes wrong there. That will
    cause start_userspace to return an error. copy_context_skas0 and
    map_stub_pages also now return errors instead of panicing. Callers of thes
    functions were changed to check for errors and do something appropriate.
    Usually that's to return an error to their callers.
    check_skas3_ptrace_faultinfo just exits since that's too early to do anything
    else.

    save_registers, restore_registers, and init_registers now return status
    instead of panicing on failure, with their callers doing something
    appropriate.

    There were also duplicate declarations of save_registers and restore_registers
    in os.h - these are gone.

    I noticed and fixed up some whitespace damage.

    Signed-off-by: Jeff Dike
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Jeff Dike
     
  • d83ecf083   uml: tidy pgtable.h ... Browse Code »

    Large pieces of include/asm/pgtable.h were unused cruft.

    This uncovered arch/um/kernel/trap.c needing skas.h in order to get
    ptrace_faultinfo.

    Signed-off-by: Jeff Dike
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Jeff Dike
     
  • edea13858   uml: tidy kern_util.h ... Browse Code »

    Tidy kern_util.h. It turns out that most of the function declarations
    aren't used, so they can go away. os.h no longer includes
    kern_util.h, so files which got it through os.h now need to include it
    directly. A number of other files never needed it, so these includes
    are deleted.

    The structure which was used to pass signal handlers from the kernel
    side to the userspace side is gone. Instead, the handlers are
    declared here, and used directly from libc code. This allows
    arch/um/os-Linux/trap.c to be deleted, with its remnants being moved
    to arch/um/os-Linux/skas/trap.c.

    arch/um/os-Linux/tty.c had its inclusions changed, and it needed some
    style attention, so it got tidied.

    Signed-off-by: Jeff Dike
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Jeff Dike
     
  • 9226b8384   uml: further bugs.c tidying ... Browse Code »

    bugs.c, for both i386 and x86_64, can undergo further cleaning -
    The i386 arch_check_bugs only does one thing, so we might as
    well inline the cmov checking.
    The i386 includes can be trimmed down a bit.
    arch_init_thread wasn't used, so it is deleted.
    The panics in arch_handle_signal are turned into printks
    because the process is about to get segfaulted anyway, so something is
    dying no matter what happens here. Also, the return value was always
    the same, so it contained no information, so it can be void instead.
    The name is changed to arch_examine_signal because it doesn't handle
    anything.
    The caller of arch_handle_signal, relay_signal, does things in
    a different order. The kernel-mode signal check is now first, which
    puts everything else together, making things a bit clearer conceptually.

    [akpm@linux-foundation.org: coding-style fixes]
    Signed-off-by: Jeff Dike
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Jeff Dike
     

20 Oct, 2007

1 commit

  • b460cbc58   pid namespaces: define is_global_init() and is_container_init() ... Browse Code »

    is_init() is an ambiguous name for the pid==1 check. Split it into
    is_global_init() and is_container_init().

    A cgroup init has it's tsk->pid == 1.

    A global init also has it's tsk->pid == 1 and it's active pid namespace
    is the init_pid_ns. But rather than check the active pid namespace,
    compare the task structure with 'init_pid_ns.child_reaper', which is
    initialized during boot to the /sbin/init process and never changes.

    Changelog:

    2.6.22-rc4-mm2-pidns1:
    - Use 'init_pid_ns.child_reaper' to determine if a given task is the
    global init (/sbin/init) process. This would improve performance
    and remove dependence on the task_pid().

    2.6.21-mm2-pidns2:

    - [Sukadev Bhattiprolu] Changed is_container_init() calls in {powerpc,
    ppc,avr32}/traps.c for the _exception() call to is_global_init().
    This way, we kill only the cgroup if the cgroup's init has a
    bug rather than force a kernel panic.

    [akpm@linux-foundation.org: fix comment]
    [sukadev@us.ibm.com: Use is_global_init() in arch/m32r/mm/fault.c]
    [bunk@stusta.de: kernel/pid.c: remove unused exports]
    [sukadev@us.ibm.com: Fix capability.c to work with threaded init]
    Signed-off-by: Serge E. Hallyn
    Signed-off-by: Sukadev Bhattiprolu
    Acked-by: Pavel Emelianov
    Cc: Eric W. Biederman
    Cc: Cedric Le Goater
    Cc: Dave Hansen
    Cc: Herbert Poetzel
    Cc: Kirill Korotaev
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Serge E. Hallyn
     

17 Oct, 2007

4 commits

  • fab95c55e   uml: get rid of do_longjmp ... Browse Code »

    do_longjmp used to be needed when UML didn't have its own implementation of
    setjmp and longjmp. They came from libc, and couldn't be called directly from
    kernel code, as the libc jmp_buf couldn't be imported there. do_longjmp was a
    userspace function which served to provide longjmp access to kernel code.

    This is gone, and a number of void * pointers can now be jmp_buf *.

    Signed-off-by: Jeff Dike
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Jeff Dike
     
  • 77bf44003   uml: remove code made redundant by CHOOSE_MODE removal ... Browse Code »

    This patch makes a number of simplifications enabled by the removal of
    CHOOSE_MODE. There were lots of functions that looked like

    int foo(args){
    foo_skas(args);
    }

    The bodies of foo_skas are now folded into foo, and their declarations (and
    sometimes entire header files) are deleted.

    In addition, the union uml_pt_regs, which was a union between the tt and skas
    register formats, is now a struct, with the tt-mode arm of the union being
    removed.

    It turns out that usr2_handler was unused, so it is gone.

    Signed-off-by: Jeff Dike
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Jeff Dike
     
  • 4c9e13851   uml: style fixes pass 1 ... Browse Code »

    Formatting changes in the files which have been changed in the
    tt-removal patchset so far. These include:
    copyright updates
    header file trimming
    style fixes
    adding severity to printks
    indenting Kconfig help according to the predominant kernel style

    These changes should be entirely non-functional.

    Signed-off-by: Jeff Dike
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Jeff Dike
     
  • 42fda6638   uml: throw out CONFIG_MODE_TT ... Browse Code »

    This patchset throws out tt mode, which has been non-functional for a while.

    This is done in phases, interspersed with code cleanups on the affected files.

    The removal is done as follows:
    remove all code, config options, and files which depend on
    CONFIG_MODE_TT
    get rid of the CHOOSE_MODE macro, which decided whether to
    call tt-mode or skas-mode code, and replace invocations with their
    skas portions
    replace all now-trivial procedures with their skas equivalents

    There are now a bunch of now-redundant pieces of data structures, including
    mode-specific pieces of the thread structure, pt_regs, and mm_context. These
    are all replaced with their skas-specific contents.

    As part of the ongoing style compliance project, I made a style pass over all
    files that were changed. There are three such patches, one for each phase,
    covering the files affected by that phase but no later ones.

    I noticed that we weren't freeing the LDT state associated with a process when
    it exited, so that's fixed in one of the later patches.

    The last patch is a tidying patch which I've had for a while, but which caused
    inexplicable crashes under tt mode. Since that is no longer a problem, this
    can now go in.

    This patch:

    Start getting rid of tt mode support.

    This patch throws out CONFIG_MODE_TT and all config options, code, and files
    which depend on it.

    CONFIG_MODE_SKAS is gone and everything that depends on it is included
    unconditionally.

    The few changed lines are in re-written Kconfig help, lines which needed
    something skas-related removed from them, and a few more which weren't
    strictly deletions.

    Signed-off-by: Jeff Dike
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Jeff Dike
     

20 Jul, 2007

1 commit

  • 83c54070e   mm: fault feedback #2 ... Browse Code »

    This patch completes Linus's wish that the fault return codes be made into
    bit flags, which I agree makes everything nicer. This requires requires
    all handle_mm_fault callers to be modified (possibly the modifications
    should go further and do things like fault accounting in handle_mm_fault --
    however that would be for another patch).

    [akpm@linux-foundation.org: fix alpha build]
    [akpm@linux-foundation.org: fix s390 build]
    [akpm@linux-foundation.org: fix sparc build]
    [akpm@linux-foundation.org: fix sparc64 build]
    [akpm@linux-foundation.org: fix ia64 build]
    Signed-off-by: Nick Piggin
    Cc: Richard Henderson
    Cc: Ivan Kokshaysky
    Cc: Russell King
    Cc: Ian Molton
    Cc: Bryan Wu
    Cc: Mikael Starvik
    Cc: David Howells
    Cc: Yoshinori Sato
    Cc: "Luck, Tony"
    Cc: Hirokazu Takata
    Cc: Geert Uytterhoeven
    Cc: Roman Zippel
    Cc: Greg Ungerer
    Cc: Matthew Wilcox
    Cc: Paul Mackerras
    Cc: Benjamin Herrenschmidt
    Cc: Heiko Carstens
    Cc: Martin Schwidefsky
    Cc: Paul Mundt
    Cc: Kazumoto Kojima
    Cc: Richard Curnow
    Cc: William Lee Irwin III
    Cc: "David S. Miller"
    Cc: Jeff Dike
    Cc: Paolo 'Blaisorblade' Giarrusso
    Cc: Miles Bader
    Cc: Chris Zankel
    Acked-by: Kyle McMartin
    Acked-by: Haavard Skinnemoen
    Acked-by: Ralf Baechle
    Acked-by: Andi Kleen
    Signed-off-by: Andrew Morton
    [ Still apparently needs some ARM and PPC loving - Linus ]
    Signed-off-by: Linus Torvalds

    Nick Piggin
     

08 May, 2007

6 commits

  • 83ff7df5f   uml: out of tmpfs space error clarification ... Browse Code »

    It turns out that the message complaining about a lack of tmpfs space
    on the host can be misunderstood as referring to the UML.

    Signed-off-by: Jeff Dike
    Cc: Paolo 'Blaisorblade' Giarrusso
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Jeff Dike
     
  • 377fad3ac   uml: kernel segfaults should dump proper registers ... Browse Code »

    If there's a segfault inside the kernel, we want a dump of the registers at
    the point of the segfault, not the registers at the point of calling panic or
    the last userspace registers.

    sig_handler_common_skas now uses a static register set in the case of a
    SIGSEGV to avoid messing up the process registers if the segfault turns out to
    be non-fatal.

    The architecture sigcontext-to-pt_regs copying code was repurposed to copy
    data out of the SEGV stack frame.

    Signed-off-by: Jeff Dike
    Cc: Paolo 'Blaisorblade' Giarrusso
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Jeff Dike
     
  • 5d86456d3   uml: tidy fault code ... Browse Code »

    Tidying in preparation for the segfault register dumping patch which follows.

    void * pointers are changed to union uml_pt_regs *. This makes the types
    match reality, except in arch_fixup, which is changed to operate on a union
    uml_pt_regs. This fixes a bug in the call from segv_handler, which passes a
    union uml_pt_regs, to segv, which expects to pass a struct sigcontext to
    arch_fixup.

    Whitespace and other style fixes.

    There's also a errno printk fix.

    Signed-off-by: Jeff Dike
    Cc: Paolo 'Blaisorblade' Giarrusso
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Jeff Dike
     
  • 9218b1714   uml: remove user_util.h ... Browse Code »

    user_util.h isn't needed any more, so delete it and remove all includes of it.

    Signed-off-by: Jeff Dike
    Cc: Paolo 'Blaisorblade' Giarrusso
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Jeff Dike
     
  • 4ff83ce11   uml: create as-layout.h ... Browse Code »

    This patch moves all the the symbols defined in um_arch.c, which are mostly
    boundaries between different parts of the UML kernel address space, to a new
    header, as-layout.h. There are also a few things here which aren't really
    related to address space layout, but which don't really have a better place to
    go.

    Signed-off-by: Jeff Dike
    Cc: Paolo 'Blaisorblade' Giarrusso
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Jeff Dike
     
  • eb8307595   uml: create arch.h ... Browse Code »

    This patch moves the declarations of the architecture hooks from user_util.h
    to a new header, arch.c, and adds the necessary includes to files which need
    those declarations.

    Signed-off-by: Jeff Dike
    Cc: Paolo 'Blaisorblade' Giarrusso
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Jeff Dike
     

12 Feb, 2007

1 commit

04 Oct, 2006

1 commit

30 Sep, 2006

1 commit

  • f400e198b   [PATCH] pidspace: is_init() ... Browse Code »

    This is an updated version of Eric Biederman's is_init() patch.
    (http://lkml.org/lkml/2006/2/6/280). It applies cleanly to 2.6.18-rc3 and
    replaces a few more instances of ->pid == 1 with is_init().

    Further, is_init() checks pid and thus removes dependency on Eric's other
    patches for now.

    Eric's original description:

    There are a lot of places in the kernel where we test for init
    because we give it special properties. Most significantly init
    must not die. This results in code all over the kernel test
    ->pid == 1.

    Introduce is_init to capture this case.

    With multiple pid spaces for all of the cases affected we are
    looking for only the first process on the system, not some other
    process that has pid == 1.

    Signed-off-by: Eric W. Biederman
    Signed-off-by: Sukadev Bhattiprolu
    Cc: Dave Hansen
    Cc: Serge Hallyn
    Cc: Cedric Le Goater
    Cc:
    Acked-by: Paul Mackerras
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Sukadev Bhattiprolu
     

27 Sep, 2006

2 commits

26 Sep, 2006

1 commit

  • 6edf428ed   [PATCH] uml: Improve SIGBUS diagnostics ... Browse Code »

    UML can get a SIGBUS anywhere if the tmpfs mount being used for its memory
    runs out of space. This patch adds a printk before the panic to provide a
    clue as to what likely went wrong.

    Signed-off-by: Jeff Dike
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Jeff Dike
     

11 Jul, 2006

1 commit

  • 1d3468a66   [PATCH] uml: move _kern.c files ... Browse Code »

    Move most *_kern.c files in arch/um/kernel to *.c. This makes UML somewhat
    more closely resemble the other arches.

    [akpm@osdl.org: use the new INTF_* flags]
    Signed-off-by: Jeff Dike
    Cc: Paolo 'Blaisorblade' Giarrusso
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Jeff Dike