1. 07 Dec, 2006 6 commits
  2. 06 Dec, 2006 1 commit
  3. 05 Dec, 2006 3 commits
  4. 04 Dec, 2006 6 commits
  5. 10 Nov, 2006 2 commits
  6. 30 Oct, 2006 1 commit
  7. 20 Oct, 2006 1 commit
  8. 17 Oct, 2006 1 commit
    • Brent Casavant's avatar
      [PATCH] ioc4: Enable build on non-SN2 · 59f14800
      Brent Casavant authored
      
      
      The SGI PCI-RT card, based on the SGI IOC4 chip, will be made available on
      Altix XE (x86_64) platforms in the near future.  As such it is now a
      misnomer for the IOC4 base device driver to live under drivers/sn, and
      would complicate builds for non-SN2.
      
      This patch moves the IOC4 base driver code from drivers/sn to drivers/misc,
      and updates the associated Makefiles and Kconfig files to allow building on
      non-SN2 configs.  Due to the resulting change in link order, it is now
      necessary to use late_initcall() for IOC4 subdriver initialization.
      
      [akpm@osdl.org: __udivdi3 fix]
      [akpm@osdl.org: fix default in Kconfig]
      Acked-by: default avatarPat Gefre <pfg@sgi.com>
      Acked-by: default avatarJeremy Higdon <jeremy@sgi.com>
      Signed-off-by: default avatarBrent Casavant <bcasavan@sgi.com>
      Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
      59f14800
  9. 12 Oct, 2006 1 commit
  10. 10 Oct, 2006 1 commit
  11. 07 Oct, 2006 1 commit
  12. 06 Oct, 2006 4 commits
  13. 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
  14. 04 Oct, 2006 11 commits