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  1. 20 12月, 2006 1 次提交
  3. 14 12月, 2006 1 次提交
  5. 11 12月, 2006 1 次提交
  7. 09 12月, 2006 12 次提交
  9. 17 11月, 2006 2 次提交
  11. 05 10月, 2006 1 次提交
    • D
      IRQ: Maintain regs pointer globally rather than passing to IRQ handlers · 7d12e780
      由 David Howells 提交于 
      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: NDavid Howells <dhowells@redhat.com>
(cherry picked from 1b16e7ac850969f38b375e511e3fa2f474a33867 commit)
      7d12e780
  13. 03 10月, 2006 4 次提交
  15. 26 9月, 2006 1 次提交
  17. 02 9月, 2006 1 次提交
  19. 31 8月, 2006 1 次提交
  21. 06 8月, 2006 1 次提交
    • O
      [PATCH] crash in aty128_set_lcd_enable() on PowerBook · c3760ae1
      由 Olaf Hering 提交于 
      Current Linus tree crashes in aty128_set_lcd_enable() because par->pdev
is NULL. This happens since at least a week. Call trace is:

aty128_set_lcd_enable
aty128fb_set_par
fbcon_init
visual_init
take_over_console
fbcon_takeover
notifier_call_chain
blocking_notifier_call_chain
register_framebuffer
aty128fb_probe
pci_device_probe
bus_for_each_dev
driver_attach
bus_add_driver
driver_register
__pci_register_driver
aty128fb_init
init
kernel_thread

- info->fix was assigned twice.

- par->vram_size is assigned in aty128_probe(), no need to redo it again
  in aty128_init()

- register_framebuffer() uses uninitialized struct members, move it past
  par->pdev assignment and past aty128_bl_init().
Signed-off-by: NOlaf Hering <olh@suse.de>
Acked-by: NAntonino Daplas <adaplas@pol.net>
Signed-off-by: NAndrew Morton <akpm@osdl.org>
Signed-off-by: NLinus Torvalds <torvalds@osdl.org>
      c3760ae1
  23. 01 8月, 2006 2 次提交
    • M
      [PATCH] powermac: More powermac backlight fixes · 4b755999
      由 Michael Hanselmann 提交于 
      This patch fixes several problems:
- The legacy backlight value might be set at interrupt time. Introduced
  a worker to prevent it from directly calling the backlight code.
- via-pmu allows the backlight to be grabbed, in which case we need to
  prevent other kernel code from changing the brightness.
- Don't send PMU requests in via-pmu-backlight when the machine is about
  to sleep or waking up.
- More Kconfig fixes.
Signed-off-by: NMichael Hanselmann <linux-kernel@hansmi.ch>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: "Antonino A. Daplas" <adaplas@pol.net>
Signed-off-by: NAndrew Morton <akpm@osdl.org>
Signed-off-by: NLinus Torvalds <torvalds@osdl.org>
      4b755999
    • V
      [PATCH] radeonfb sleep fixes · 994aad25
      由 Volker Braun 提交于 
      Many IBM Thinkpad T4* models and some R* and X* with radeon video cards draw
too much power when suspended to RAM, reducing drastically the battery
lifetime.  The solution is to enable suspend-to-D2 on these machines.  They
are whitelisted through their subsystem vendor/device ID.  This fixes
http://bugzilla.kernel.org/show_bug.cgi?id=3022

The patch introduces a framework to alter the pm_mode and reinit_func fields
of the radeonfb_info structure based on a whitelist.  This should facilitate
future hardware-dependent workarounds.  The workaround for the Samsung P35
that is already in the radeonfb code has been rewritten using this framework.

The behavior can be overridden with module options:

i)  video=radeonfb:force_sleep=1
    enable suspend-to-D2 also on non-whitelisted machines (useful for
    testing new notebook models),

ii) video=radeonfb:ignore_devlist=1
    Disable checking the whitelist and do not apply any workarounds.

Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: "Antonino A. Daplas" <adaplas@pol.net>
Signed-off-by: NAndrew Morton <akpm@osdl.org>
Signed-off-by: NLinus Torvalds <torvalds@osdl.org>
      994aad25
  25. 31 7月, 2006 1 次提交
  27. 11 7月, 2006 2 次提交
  29. 03 7月, 2006 1 次提交
  31. 01 7月, 2006 2 次提交
  33. 29 6月, 2006 1 次提交
  35. 27 6月, 2006 5 次提交