Eric Lee / smarc-fsl-linux-kernel

08 Dec, 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
     

30 Sep, 2006

1 commit

12 Jul, 2006

1 commit

  • b94ea6c08   [ARM] 3727/1: fix ucb initialization on collie ... Browse Code »

    Patch from Pavel Machek

    From: Dirk Opfer

    Fix ucb initialization on collie. Wrong frequency was used and that
    led to things not working quite correctly. (I had to actually disable
    checks in my tree to get it to boot). It now includes all the
    neccessary parts to get it to compile :-).

    Signed-off-by: Pavel Machek
    Acked-by: Richard Purdie
    Signed-off-by: Russell King

    Pavel Machek
     

03 Jul, 2006

1 commit

01 Jul, 2006

1 commit

26 Jun, 2006

1 commit

  • cfc736564   [ARM] fix drivers/mfd/ucb1x00-core.c IRQ probing bug ... Browse Code »

    While reviewing the IRQ autoprobing code i found the attached buglet.
    probe_irq_on()/off() calls must always be in pairs, because the generic IRQ
    code uses a global semaphore to serialize all autoprobing activites.
    (which does make sense) The ARM code's probe_irq_*() implementation does
    not do this, but if this driver is ever used on another platform, this bug
    might bite.

    (It probably does not trigger in practice, because a zero probing mask
    returned should be rare - but still.)

    Signed-off-by: Ingo Molnar
    Signed-off-by: Andrew Morton
    Signed-off-by: Russell King

    Ingo Molnar
     

24 Mar, 2006

1 commit

  • f751d50f6   [PATCH] show MCP menu only on ARCH_SA1100 ... Browse Code »

    On architectures like i386, the "Multimedia Capabilities Port drivers" menu is
    visible, but it can't be visited since it contains nothing usable for
    !ARCH_SA1100.

    This patch therefore shows this menu only on ARCH_SA1100.

    Signed-off-by: Adrian Bunk
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Adrian Bunk
     

14 Jan, 2006

1 commit

13 Jan, 2006

1 commit

09 Jan, 2006

2 commits

  • 44fce35f2   [PATCH] drivers/mfd: header included twice ... Browse Code »

    linux/delay.h included twice

    Signed-off-by: Nicolas Kaiser
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Nicolas Kaiser
     
  • 9ded96f24   [PATCH] IRQ type flags ... Browse Code »

    Some ARM platforms have the ability to program the interrupt controller to
    detect various interrupt edges and/or levels. For some platforms, this is
    critical to setup correctly, particularly those which the setting is dependent
    on the device.

    Currently, ARM drivers do (eg) the following:

    err = request_irq(irq, ...);

    set_irq_type(irq, IRQT_RISING);

    However, if the interrupt has previously been programmed to be level sensitive
    (for whatever reason) then this will cause an interrupt storm.

    Hence, if we combine set_irq_type() with request_irq(), we can then safely set
    the type prior to unmasking the interrupt. The unfortunate problem is that in
    order to support this, these flags need to be visible outside of the ARM
    architecture - drivers such as smc91x need these flags and they're
    cross-architecture.

    Finally, the SA_TRIGGER_* flag passed to request_irq() should reflect the
    property that the device would like. The IRQ controller code should do its
    best to select the most appropriate supported mode.

    Signed-off-by: Russell King
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Russell King
     

13 Dec, 2005

1 commit

  • 1393c3edc   [PATCH] input: fix ucb1x00-ts breakage after conversion to dynamic input_dev allocation ... Browse Code »

    The bd622663192e8ebebb27dc1d9397f352a82d2495 commit broke the UCB1x00
    touchscreen driver since the idev structure was assumed to be into the ts
    structure, simply casting the former to the later in a couple places.

    This patch fixes those, and also cache the idev pointer between multiple
    calls to input_report_abs() to avoid growing the compiled code needlessly.

    Signed-off-by: Nicolas Pitre
    Cc: Dmitry Torokhov
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Nicolas Pitre
     

10 Nov, 2005

1 commit

07 Nov, 2005

1 commit

  • 8c65b4a60   [PATCH] fix remaining missing includes ... Browse Code »

    Fix more include file problems that surfaced since I submitted the previous
    fix-missing-includes.patch. This should now allow not to include sched.h
    from module.h, which is done by a followup patch.

    Signed-off-by: Tim Schmielau
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Tim Schmielau
     

31 Oct, 2005

2 commits

30 Oct, 2005

1 commit

29 Oct, 2005

2 commits

  • 9480e307c   [PATCH] DRIVER MODEL: Get rid of the obsolete tri-level suspend/resume callbacks ... Browse Code »

    In PM v1, all devices were called at SUSPEND_DISABLE level. Then
    all devices were called at SUSPEND_SAVE_STATE level, and finally
    SUSPEND_POWER_DOWN level. However, with PM v2, to maintain
    compatibility for platform devices, I arranged for the PM v2
    suspend/resume callbacks to call the old PM v1 suspend/resume
    callbacks three times with each level in order so that existing
    drivers continued to work.

    Since this is obsolete infrastructure which is no longer necessary,
    we can remove it. Here's an (untested) patch to do exactly that.

    Signed-off-by: Russell King
    Signed-off-by: Greg Kroah-Hartman

    Russell King
     
  • bd6226631   [PATCH] Input: convert ucb1x00-ts to dynamic input_dev allocation ... Browse Code »

    Input: convert ucb1x00-ts to dynamic input_dev allocation

    This is required for input_dev sysfs integration

    Signed-off-by: Dmitry Torokhov
    Signed-off-by: Greg Kroah-Hartman

    Dmitry Torokhov
     

11 Oct, 2005

1 commit

06 Oct, 2005

1 commit

  • a448a2858   [MFD] Fix gcc4 build errors in ucb1x00-core.c ... Browse Code »

    drivers/mfd/ucb1x00-core.c:555: error: static declaration of 'ucb1x00_class' follows non-static declaration
    drivers/mfd/ucb1x00.h:109: error: previous declaration of 'ucb1x00_class' was here

    Since ucb1x00_class isn't used by anything, remove the extern
    declaration and the symbol export.

    Signed-off-by: Russell King

    Russell King
     

24 Sep, 2005

1 commit

11 Sep, 2005

4 commits

18 Aug, 2005

3 commits