Eric Lee / smarc-fsl-linux-kernel

05 Nov, 2006

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
     

02 Oct, 2006

2 commits

  • a12f66fcc   Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input ... Browse Code »

    * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input: (35 commits)
    Input: wistron - add support for Acer TravelMate 2424NWXCi
    Input: wistron - fix setting up special buttons
    Input: add KEY_BLUETOOTH and KEY_WLAN definitions
    Input: add new BUS_VIRTUAL bus type
    Input: add driver for stowaway serial keyboards
    Input: make input_register_handler() return error codes
    Input: remove cruft that was needed for transition to sysfs
    Input: fix input module refcounting
    Input: constify input core
    Input: libps2 - rearrange exports
    Input: atkbd - support Microsoft Natural Elite Pro keyboards
    Input: i8042 - disable MUX mode on Toshiba Equium A110
    Input: i8042 - get rid of polling timer
    Input: send key up events at disconnect
    Input: constify psmouse driver
    Input: i8042 - add Amoi to the MUX blacklist
    Input: logips2pp - add sugnature 56 (Cordless MouseMan Wheel), cleanup
    Input: add driver for Touchwin serial touchscreens
    Input: add driver for Touchright serial touchscreens
    Input: add driver for Penmount serial touchscreens
    ...

    Linus Torvalds
     
  • 81af8d67d   [PATCH] vt: rework the console spawning variables ... Browse Code »

    This is such a rare path it took me a while to figure out how to test
    this after soring out the locking.

    This patch does several things.
    - The variables used are moved into a structure and declared in vt_kern.h
    - A spinlock is added so we don't have SMP races updating the values.
    - Instead of raw pid_t value a struct_pid is used to guard against
    pid wrap around issues, if the daemon to spawn a new console dies.

    Signed-off-by: Eric W. Biederman
    Cc: Oleg Nesterov
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Eric W. Biederman
     

19 Sep, 2006

1 commit

14 Sep, 2006

2 commits

05 Aug, 2006

1 commit

19 Jul, 2006

2 commits

06 Jul, 2006

2 commits

  • 0e739d287   Input: introduce input_inject_event() function ... Browse Code »

    Create input_inject_event() function which is to be used by input
    handlers as opposed to input_event() which is reserved for drivers
    implementing input devices. The difference is that if device is
    "grabbed" by some process input_inject_event() will ignore events
    unless sent from the handle that is currently owns the device.

    Signed-off-by: Dmitry Torokhov

    Dmitry Torokhov
     
  • c7e8dc6ee   Input: add start() method to input handlers ... Browse Code »

    The new start() method is called immediately after connect() and also
    when "grabbed" device is released by its owner. This will allow input
    handlers to re-synchronize state of once-grabbed device with the rest
    of devices.

    Signed-off-by: Dmitry Torokhov

    Dmitry Torokhov
     

01 Jul, 2006

1 commit

27 Jun, 2006

2 commits

  • cdf4f383a   Merge master.kernel.org:/pub/scm/linux/kernel/git/dtor/input ... Browse Code »

    * master.kernel.org:/pub/scm/linux/kernel/git/dtor/input:
    Input: iforce - remove some pointless casts
    Input: psmouse - add support for Intellimouse 4.0
    Input: atkbd - fix HANGEUL/HANJA keys
    Input: fix misspelling of Hangeul key
    Input: via-pmu - add input device support
    Input: rearrange exports
    Input: fix formatting to better follow CodingStyle
    Input: reset name, phys and uniq when unregistering
    Input: return correct size when reading modalias attribute
    Input: change my e-mail address in MAINTAINERS file
    Input: fix potential overflows in driver/input/keyboard
    Input: fix potential overflows in driver/input/touchscreen
    Input: fix potential overflows in driver/input/joystick
    Input: fix potential overflows in driver/input/mouse
    Input: fix accuracy of fixp-arith.h
    Input: iforce - use ENOSPC instead of ENOMEM
    Input: constify drivers/char/keyboard.c

    Linus Torvalds
     
  • d2be8ee53   [PATCH] fix magic sysrq on strange keyboards ... Browse Code »

    Magic sysrq fails to work on many keyboards, particulary most of notebook
    keyboards. This patch fixes it.

    The idea is quite simple: Discard the SysRq break code if Alt is still being
    held down. This way the broken keyboard can send the break code (or the user
    with a normal keyboard can release the SysRq key) and the kernel waits until
    the next key is pressed or the Alt key is released.

    Signed-off-by: Pavel Machek
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Fredrik Roubert
     

26 Jun, 2006

4 commits

05 Jun, 2006

1 commit

26 Apr, 2006

1 commit

02 Apr, 2006

1 commit

  • b9ec4e109   Input: add support for Braille devices ... Browse Code »

    - Add KEY_BRL_* input keys and K_BRL_* keycodes;
    - Add emulation of how braille keyboards usually combine braille dots
    to the console keyboard driver;
    - Add handling of unicode U+28xy diacritics.

    Signed-off-by: Samuel Thibault
    Signed-off-by: Dmitry Torokhov

    Samuel Thibault
     

23 Dec, 2005

1 commit

11 Sep, 2005

1 commit

10 Sep, 2005

2 commits

04 Sep, 2005

1 commit

24 Jul, 2005

1 commit

06 May, 2005

1 commit

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