Eric Lee / smarc-fsl-linux-kernel

06 Nov, 2006

1 commit

15 Oct, 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
     

03 Jul, 2006

2 commits

  • b4b903413   Merge branch 'genirq' of master.kernel.org:/home/rmk/linux-2.6-arm ... Browse Code »

    * 'genirq' of master.kernel.org:/home/rmk/linux-2.6-arm: (24 commits)
    [ARM] 3683/2: ARM: Convert at91rm9200 to generic irq handling
    [ARM] 3682/2: ARM: Convert ixp4xx to generic irq handling
    [ARM] 3702/1: ARM: Convert ixp23xx to generic irq handling
    [ARM] 3701/1: ARM: Convert plat-omap to generic irq handling
    [ARM] 3700/1: ARM: Convert lh7a40x to generic irq handling
    [ARM] 3699/1: ARM: Convert s3c2410 to generic irq handling
    [ARM] 3698/1: ARM: Convert sa1100 to generic irq handling
    [ARM] 3697/1: ARM: Convert shark to generic irq handling
    [ARM] 3696/1: ARM: Convert clps711x to generic irq handling
    [ARM] 3694/1: ARM: Convert ecard driver to generic irq handling
    [ARM] 3693/1: ARM: Convert omap1 to generic irq handling
    [ARM] 3691/1: ARM: Convert imx to generic irq handling
    [ARM] 3688/1: ARM: Convert clps7500 to generic irq handling
    [ARM] 3687/1: ARM: Convert integrator to generic irq handling
    [ARM] 3685/1: ARM: Convert pxa to generic irq handling
    [ARM] 3684/1: ARM: Convert l7200 to generic irq handling
    [ARM] 3681/1: ARM: Convert ixp2000 to generic irq handling
    [ARM] 3680/1: ARM: Convert footbridge to generic irq handling
    [ARM] 3695/1: ARM drivers/pcmcia: Fixup includes
    [ARM] 3689/1: ARM drivers/input/touchscreen: Fixup includes
    ...

    Manual conflict resolved in kernel/irq/handle.c (butt-ugly ARM tickless
    code).

    Linus Torvalds
     
  • dace14537   [PATCH] irq-flags: misc drivers: Use the new IRQF_ constants ... Browse Code »

    Signed-off-by: Thomas Gleixner
    Cc: Ingo Molnar
    Cc: "David S. Miller"
    Cc: Benjamin Herrenschmidt
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Thomas Gleixner
     

02 Jul, 2006

1 commit

30 Apr, 2006

1 commit

  • cd95842ca   [ARM] 3486/1: Mark memory as clobbered by the ARM _syscallX() macros ... Browse Code »

    Patch from Markus Gutschke

    In order to prevent gcc from making incorrect optimizations, all asm()
    statements that define system calls should report memory as
    clobbered. Recent versions of the headers for i386 have been changed
    accordingly, but the ARM headers are still defective.

    This patch fixes the bug tracked at
    http://bugzilla.kernel.org/show_bug.cgi?id=6205

    Signed-off-by: Markus Gutschke
    Signed-off-by: Russell King

    Markus Gutschke
     

10 Nov, 2005

1 commit

30 Oct, 2005

1 commit

29 Oct, 2005

2 commits

13 Sep, 2005

1 commit

  • 513b6e1af   [PATCH] SharpSL: Abstract c7x0 specifics from Corgi Touchscreen driver ... Browse Code »

    Separate out the Sharp Zaurus c7x0 series specific code from the Corgi
    Touchscreen driver. Use the new functions in corgi_lcd.c via sharpsl.h for
    hsync handling and pass the IRQ as a platform device resource. Move a
    function prototype into the w100fb header file where it belongs.

    This enables the driver to be used by the Zaurus cxx00 series.

    Signed-Off-by: Richard Purdie
    Cc: Vojtech Pavlik
    Cc: Russell King
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Richard Purdie
     

08 Sep, 2005

4 commits

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