1. 28 Jan, 2008 9 commits
  2. 10 Oct, 2007 6 commits
  3. 17 Jul, 2007 1 commit
    • Rafael J. Wysocki's avatar
      Freezer: make kernel threads nonfreezable by default · 83144186
      Rafael J. Wysocki authored
      Currently, the freezer treats all tasks as freezable, except for the kernel
      threads that explicitly set the PF_NOFREEZE flag for themselves.  This
      approach is problematic, since it requires every kernel thread to either
      set PF_NOFREEZE explicitly, or call try_to_freeze(), even if it doesn't
      care for the freezing of tasks at all.
      It seems better to only require the kernel threads that want to or need to
      be frozen to use some freezer-related code and to remove any
      freezer-related code from the other (nonfreezable) kernel threads, which is
      done in this patch.
      The patch causes all kernel threads to be nonfreezable by default (ie.  to
      have PF_NOFREEZE set by default) and introduces the set_freezable()
      function that should be called by the freezable kernel threads in order to
      unset PF_NOFREEZE.  It also makes all of the currently freezable kernel
      threads call set_freezable(), so it shouldn't cause any (intentional)
      change of behaviour to appear.  Additionally, it updates documentation to
      describe the freezing of tasks more accurately.
      [akpm@linux-foundation.org: build fixes]
      Signed-off-by: default avatarRafael J. Wysocki <rjw@sisk.pl>
      Acked-by: default avatarNigel Cunningham <nigel@nigel.suspend2.net>
      Cc: Pavel Machek <pavel@ucw.cz>
      Cc: Oleg Nesterov <oleg@tv-sign.ru>
      Cc: Gautham R Shenoy <ego@in.ibm.com>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
  4. 10 Jul, 2007 5 commits
  5. 08 May, 2007 1 commit
  6. 28 Apr, 2007 2 commits
  7. 25 Apr, 2007 3 commits
  8. 16 Mar, 2007 1 commit
  9. 14 Feb, 2007 1 commit
  10. 12 Feb, 2007 1 commit
  11. 07 Dec, 2006 1 commit
  12. 16 Oct, 2006 3 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
      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:
      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
      Signed-Off-By: default avatarDavid Howells <dhowells@redhat.com>
      (cherry picked from 1b16e7ac850969f38b375e511e3fa2f474a33867 commit)
  14. 01 Oct, 2006 1 commit
    • Jeff Garzik's avatar
      drivers/net/wireless/{airo,ipw2100}: fix error handling bugs · de897881
      Jeff Garzik authored
      * fix oops, if !CONFIG_PROC_FS (create_proc_entry always returns NULL)
      * handle pci_register_driver() failure.  if it fails, we really do
        want to exit, rather than (as a comment indicates) return success
      * #if 0 have_isa_dev variable, which is assigned a value but never used
      * handle sysfs_create_group() failure
      * handle driver_create_file() failure
      Signed-off-by: default avatarJeff Garzik <jeff@garzik.org>
  15. 25 Sep, 2006 1 commit
  16. 20 Sep, 2006 1 commit
  17. 29 Aug, 2006 1 commit
    • Sukadev Bhattiprolu's avatar
      [PATCH] kthread: airo.c · 3b4c7d64
      Sukadev Bhattiprolu authored
      The airo driver is currently caching a pid for later use, but with the
      implementation of containers, pids themselves do not uniquely identify a
      task.  The driver is also using kernel_thread() which is deprecated in
      This patch essentially replaces the kernel_thread() with kthread_create().
      It also stores the task_struct of the airo_thread rather than its pid.
      Since this introduces a second task_struct in struct airo_info, the patch
      renames airo_info.task to airo_info.list_bss_task.
      As an extension of these changes, the patch further:
      	 - replaces kill_proc() with kthread_stop()
      	 - replaces signal_pending() with kthread_should_stop()
      	 - removes thread completion synchronisation which is handled by
      [akpm@osdl.org: fix races]
      Signed-off-by: default avatarSukadev Bhattiprolu <sukadev@us.ibm.com>
      Cc: Javier Achirica <achirica@gmail.com>
      Cc: Christoph Hellwig <hch@infradead.org>
      Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
      Signed-off-by: default avatarJohn W. Linville <linville@tuxdriver.com>
  18. 27 Jul, 2006 1 commit