1. 22 11月, 2006 3 次提交
    • D
      WorkStruct: Pass the work_struct pointer instead of context data · 65f27f38
      David Howells 提交于
      Pass the work_struct pointer to the work function rather than context data.
      The work function can use container_of() to work out the data.
      
      For the cases where the container of the work_struct may go away the moment the
      pending bit is cleared, it is made possible to defer the release of the
      structure by deferring the clearing of the pending bit.
      
      To make this work, an extra flag is introduced into the management side of the
      work_struct.  This governs auto-release of the structure upon execution.
      
      Ordinarily, the work queue executor would release the work_struct for further
      scheduling or deallocation by clearing the pending bit prior to jumping to the
      work function.  This means that, unless the driver makes some guarantee itself
      that the work_struct won't go away, the work function may not access anything
      else in the work_struct or its container lest they be deallocated..  This is a
      problem if the auxiliary data is taken away (as done by the last patch).
      
      However, if the pending bit is *not* cleared before jumping to the work
      function, then the work function *may* access the work_struct and its container
      with no problems.  But then the work function must itself release the
      work_struct by calling work_release().
      
      In most cases, automatic release is fine, so this is the default.  Special
      initiators exist for the non-auto-release case (ending in _NAR).
      Signed-Off-By: NDavid Howells <dhowells@redhat.com>
      65f27f38
    • D
      WorkStruct: Merge the pending bit into the wq_data pointer · 365970a1
      David Howells 提交于
      Reclaim a word from the size of the work_struct by folding the pending bit and
      the wq_data pointer together.  This shouldn't cause misalignment problems as
      all pointers should be at least 4-byte aligned.
      Signed-Off-By: NDavid Howells <dhowells@redhat.com>
      365970a1
    • D
      WorkStruct: Typedef the work function prototype · 6bb49e59
      David Howells 提交于
      Define a type for the work function prototype.  It's not only kept in the
      work_struct struct, it's also passed as an argument to several functions.
      
      This makes it easier to change it.
      Signed-Off-By: NDavid Howells <dhowells@redhat.com>
      6bb49e59
  2. 05 10月, 2006 1 次提交
    • D
      IRQ: Maintain regs pointer globally rather than passing to IRQ handlers · 7d12e780
      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
  3. 01 10月, 2006 1 次提交
    • J
      [PATCH] Split struct request ->flags into two parts · 4aff5e23
      Jens Axboe 提交于
      Right now ->flags is a bit of a mess: some are request types, and
      others are just modifiers. Clean this up by splitting it into
      ->cmd_type and ->cmd_flags. This allows introduction of generic
      Linux block message types, useful for sending generic Linux commands
      to block devices.
      Signed-off-by: NJens Axboe <axboe@suse.de>
      4aff5e23
  4. 02 9月, 2006 1 次提交
  5. 04 7月, 2006 1 次提交
    • I
      [PATCH] lockdep: floppy.c irq release fix · 3e541a4a
      Ingo Molnar 提交于
      The lock validator triggered a number of bugs in the floppy driver, all
      related to the floppy driver allocating and freeing irq and dma resources from
      interrupt context.  The initial solution was to use schedule_work() to push
      this into process context, but this caused further problems: for example the
      current floppy driver in -mm2 is totally broken and all floppy commands time
      out with an error.  (as reported by Barry K.  Nathan)
      
      This patch tries another solution: simply get rid of all that dynamic IRQ and
      DMA allocation/freeing.  I doubt it made much sense back in the heydays of
      floppies (if two devices raced for DMA or IRQ resources then we didnt handle
      those cases too gracefully anyway), and today it makes near zero sense.
      
      So the new code does the simplest and most straightforward thing: allocate IRQ
      and DMA resources at module init time, and free them at module removal time.
      Dont try to release while the driver is operational.  This, besides making the
      floppy driver functional again has an added bonus, floppy IRQ stats are
      finally persistent and visible in /proc/interrupts:
      
        6: 63 XT-PIC-level floppy
      
      Besides normal floppy IO i have also tested IO error handling, motor-off
      timeouts, etc.  - and everything seems to be working fine.
      Signed-off-by: NIngo Molnar <mingo@elte.hu>
      Signed-off-by: NArjan van de Ven <arjan@linux.intel.com>
      Signed-off-by: NAndrew Morton <akpm@osdl.org>
      Signed-off-by: NLinus Torvalds <torvalds@osdl.org>
      3e541a4a
  6. 27 6月, 2006 4 次提交
  7. 28 4月, 2006 1 次提交
  8. 29 3月, 2006 1 次提交
  9. 27 3月, 2006 1 次提交
  10. 26 3月, 2006 1 次提交
  11. 23 3月, 2006 1 次提交
  12. 15 1月, 2006 1 次提交
  13. 09 1月, 2006 2 次提交
    • T
      [PATCH] drivers/block: Use ARRAY_SIZE macro · 945f390f
      Tobias Klauser 提交于
      Use ARRAY_SIZE macro instead of sizeof(x)/sizeof(x[0]) and remove a
      duplicate of ARRAY_SIZE. Some trailing whitespaces are also removed.
      
      drivers/block/acsi* has been left out as it's marked BROKEN.
      Signed-off-by: NTobias Klauser <tklauser@nuerscht.ch>
      Cc: Jens Axboe <axboe@suse.de>
      Signed-off-by: NAndrew Morton <akpm@osdl.org>
      Signed-off-by: NLinus Torvalds <torvalds@osdl.org>
      945f390f
    • C
      [PATCH] Add block_device_operations.getgeo block device method · a885c8c4
      Christoph Hellwig 提交于
      HDIO_GETGEO is implemented in most block drivers, and all of them have to
      duplicate the code to copy the structure to userspace, as well as getting
      the start sector.  This patch moves that to common code [1] and adds a
      ->getgeo method to fill out the raw kernel hd_geometry structure.  For many
      drivers this means ->ioctl can go away now.
      
      [1] the s390 block drivers are odd in this respect.  xpram sets ->start
          to 4 always which seems more than odd, and the dasd driver shifts
          the start offset around, probably because of it's non-standard
          sector size.
      Signed-off-by: NChristoph Hellwig <hch@lst.de>
      Cc: Jens Axboe <axboe@suse.de>
      Cc: <mike.miller@hp.com>
      Cc: Jeff Dike <jdike@addtoit.com>
      Cc: Paolo Giarrusso <blaisorblade@yahoo.it>
      Cc: Bartlomiej Zolnierkiewicz <B.Zolnierkiewicz@elka.pw.edu.pl>
      Cc: Neil Brown <neilb@cse.unsw.edu.au>
      Cc: Markus Lidel <Markus.Lidel@shadowconnect.com>
      Cc: Russell King <rmk@arm.linux.org.uk>
      Cc: David Woodhouse <dwmw2@infradead.org>
      Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
      Cc: James Bottomley <James.Bottomley@steeleye.com>
      Signed-off-by: NAdrian Bunk <bunk@stusta.de>
      Signed-off-by: NAndrew Morton <akpm@osdl.org>
      Signed-off-by: NLinus Torvalds <torvalds@osdl.org>
      a885c8c4
  14. 06 1月, 2006 1 次提交
    • T
      [BLOCK] add @uptodate to end_that_request_last() and @error to rq_end_io_fn() · 8ffdc655
      Tejun Heo 提交于
      add @uptodate argument to end_that_request_last() and @error
      to rq_end_io_fn().  there's no generic way to pass error code
      to request completion function, making generic error handling
      of non-fs request difficult (rq->errors is driver-specific and
      each driver uses it differently).  this patch adds @uptodate
      to end_that_request_last() and @error to rq_end_io_fn().
      
      for fs requests, this doesn't really matter, so just using the
      same uptodate argument used in the last call to
      end_that_request_first() should suffice.  imho, this can also
      help the generic command-carrying request jens is working on.
      Signed-off-by: Ntejun heo <htejun@gmail.com>
      Signed-Off-By: NJens Axboe <axboe@suse.de>
      8ffdc655
  15. 24 11月, 2005 1 次提交
  16. 09 11月, 2005 2 次提交
  17. 08 11月, 2005 1 次提交
  18. 30 10月, 2005 1 次提交
  19. 10 9月, 2005 1 次提交
  20. 06 9月, 2005 2 次提交
  21. 06 5月, 2005 1 次提交
  22. 17 4月, 2005 1 次提交
    • L
      Linux-2.6.12-rc2 · 1da177e4
      Linus Torvalds 提交于
      Initial git repository build. I'm not bothering with the full history,
      even though we have it. We can create a separate "historical" git
      archive of that later if we want to, and in the meantime it's about
      3.2GB when imported into git - space that would just make the early
      git days unnecessarily complicated, when we don't have a lot of good
      infrastructure for it.
      
      Let it rip!
      1da177e4