1. 18 Dec, 2009 1 commit
  2. 07 Dec, 2009 1 commit
  3. 28 Nov, 2009 2 commits
    • Dominik Brodowski's avatar
      pcmcia: rework the irq_req_t typedef · 5fa9167a
      Dominik Brodowski authored
      Most of the irq_req_t typedef'd struct can be re-worked quite
      easily:
      
      (1) IRQInfo2 was unused in any case, so drop it.
      
      (2) IRQInfo1 was used write-only, so drop it.
      
      (3) Instance (private data to be passed to the IRQ handler):
      	Most PCMCIA drivers using pcmcia_request_irq() to actually
      	register an IRQ handler set the "dev_id" to the same pointer
      	as the "priv" pointer in struct pcmcia_device. Modify the two
      	exceptions (ipwireless, ibmtr_cs) to also work this waym and
      	set the IRQ handler's "dev_id" to p_dev->priv unconditionally.
      
      (4) Handler is to be of type irq_handler_t.
      
      (5) Handler != NULL already tells whether an IRQ handler is present.
      	Therefore, we do not need the IRQ_HANDLER_PRESENT flag in
      	irq_req_t.Attributes.
      
      CC: netdev@vger.kernel.org
      CC: linux-bluetooth@vger.kernel.org
      CC: linux-ide@vger.kernel.org
      CC: linux-wireless@vger.kernel.org
      CC: linux-scsi@vger.kernel.org
      CC: alsa-devel@alsa-project.org
      CC: Jaroslav Kysela <perex@perex.cz>
      CC: Jiri Kosina <jkosina@suse.cz>
      CC: Karsten Keil <isdn@linux-pingi.de>
      for the Bluetooth parts: Acked-by: Marcel Holtmann <marcel@holtmann.org>
      Signed-off-by: default avatarDominik Brodowski <linux@dominikbrodowski.net>
      5fa9167a
    • Dominik Brodowski's avatar
      pcmcia: remove deprecated handle_to_dev() macro · dd2e5a15
      Dominik Brodowski authored
      Update remaining users and remove deprecated handle_to_dev() macro
      
      CC: Harald Welte <laforge@gnumonks.org>
      CC: netdev@vger.kernel.org
      CC: linux-wireless@vger.kernel.org
      CC: linux-serial@vger.kernel.org
      Signed-off-by: default avatarDominik Brodowski <linux@dominikbrodowski.net>
      dd2e5a15
  4. 09 Nov, 2009 1 commit
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  6. 28 Apr, 2009 1 commit
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  17. 05 Dec, 2006 2 commits
  18. 08 Oct, 2006 1 commit
  19. 05 Oct, 2006 1 commit
    • David Howells's avatar
      IRQ: Maintain regs pointer globally rather than passing to IRQ handlers · 7d12e780
      David Howells authored
      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: default avatarDavid Howells <dhowells@redhat.com>
      (cherry picked from 1b16e7ac850969f38b375e511e3fa2f474a33867 commit)
      7d12e780
  20. 23 Sep, 2006 3 commits
  21. 12 Jul, 2006 1 commit
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  23. 27 Apr, 2006 1 commit
  24. 31 Mar, 2006 6 commits