Eric Lee / smarc-fsl-linux-kernel

31 Mar, 2011

1 commit

07 Jan, 2009

1 commit

  • f59abb161   parport: ieee1284: use del_timer_sync() in parport_wait_event() ... Browse Code »

    Use del_timer_sync() instead of del_timer() to make sure the timer won't
    be running when we return from parport_wait_event(), because this would
    crash due to destruction of timer_list.

    This is untested and just based on a code review. Just think about the
    following sequence of events:

    - add_timer()

    - down_interruptible() is interrupted by a signal.

    - we enter the timer callback handler on another CPU.

    - del_timer(), but the timer callback is still running.

    - eturn from parport_wait_even, which destroys the automatic variable
    "timer" while the callback is running on another CPU.

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

    Michael Buesch
     

17 Oct, 2008

1 commit

27 Jul, 2008

1 commit

30 Apr, 2008

1 commit

  • c6f3a97f8   debugobjects: add timer specific object debugging code ... Browse Code »

    Add calls to the generic object debugging infrastructure and provide fixup
    functions which allow to keep the system alive when recoverable problems have
    been detected by the object debugging core code.

    Signed-off-by: Thomas Gleixner
    Acked-by: Ingo Molnar
    Cc: Greg KH
    Cc: Randy Dunlap
    Cc: Kay Sievers
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Thomas Gleixner
     

24 Oct, 2007

1 commit

05 Oct, 2006

1 commit

  • 7d12e780e   IRQ: Maintain regs pointer globally rather than passing to IRQ handlers ... Browse Code »

    Maintain a per-CPU global "struct pt_regs *" variable which can be used instead
    of passing regs around manually through all ~1800 interrupt handlers in the
    Linux kernel.

    The regs pointer is used in few places, but it potentially costs both stack
    space and code to pass it around. On the FRV arch, removing the regs parameter
    from all the genirq function results in a 20% speed up of the IRQ exit path
    (ie: from leaving timer_interrupt() to leaving do_IRQ()).

    Where appropriate, an arch may override the generic storage facility and do
    something different with the variable. On FRV, for instance, the address is
    maintained in GR28 at all times inside the kernel as part of general exception
    handling.

    Having looked over the code, it appears that the parameter may be handed down
    through up to twenty or so layers of functions. Consider a USB character
    device attached to a USB hub, attached to a USB controller that posts its
    interrupts through a cascaded auxiliary interrupt controller. A character
    device driver may want to pass regs to the sysrq handler through the input
    layer which adds another few layers of parameter passing.

    I've build this code with allyesconfig for x86_64 and i386. I've runtested the
    main part of the code on FRV and i386, though I can't test most of the drivers.
    I've also done partial conversion for powerpc and MIPS - these at least compile
    with minimal configurations.

    This will affect all archs. Mostly the changes should be relatively easy.
    Take do_IRQ(), store the regs pointer at the beginning, saving the old one:

    struct pt_regs *old_regs = set_irq_regs(regs);

    And put the old one back at the end:

    set_irq_regs(old_regs);

    Don't pass regs through to generic_handle_irq() or __do_IRQ().

    In timer_interrupt(), this sort of change will be necessary:

    - update_process_times(user_mode(regs));
    - profile_tick(CPU_PROFILING, regs);
    + update_process_times(user_mode(get_irq_regs()));
    + profile_tick(CPU_PROFILING);

    I'd like to move update_process_times()'s use of get_irq_regs() into itself,
    except that i386, alone of the archs, uses something other than user_mode().

    Some notes on the interrupt handling in the drivers:

    (*) input_dev() is now gone entirely. The regs pointer is no longer stored in
    the input_dev struct.

    (*) finish_unlinks() in drivers/usb/host/ohci-q.c needs checking. It does
    something different depending on whether it's been supplied with a regs
    pointer or not.

    (*) Various IRQ handler function pointers have been moved to type
    irq_handler_t.

    Signed-Off-By: David Howells
    (cherry picked from 1b16e7ac850969f38b375e511e3fa2f474a33867 commit)

    David Howells
     

01 Jul, 2006

1 commit

04 Feb, 2006

1 commit

11 Sep, 2005

1 commit

  • 7b4ccf8db   [PATCH] parport: fix-up schedule_timeout() usage ... Browse Code »

    Use schedule_timeout_interruptible() instead of
    set_current_state()/schedule_timeout() to reduce kernel size. Also use
    human-time to jiffies units conversion functions rather than direct HZ
    division to avoid rounding issues.

    Signed-off-by: Nishanth Aravamudan
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Nishanth Aravamudan
     

17 Apr, 2005

1 commit

  • 1da177e4c   Linux-2.6.12-rc2 ... Browse Code »

    Initial git repository build. I'm not bothering with the full history,
    even though we have it. We can create a separate "historical" git
    archive of that later if we want to, and in the meantime it's about
    3.2GB when imported into git - space that would just make the early
    git days unnecessarily complicated, when we don't have a lot of good
    infrastructure for it.

    Let it rip!

    Linus Torvalds