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  1. 17 6月, 2007 1 次提交
  3. 24 5月, 2007 1 次提交
  5. 16 11月, 2006 1 次提交
  7. 05 10月, 2006 2 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
    • H
      [SCSI] scsi: remove hosts.h · de77aaff
      由 Henne 提交于 
      Remove the obsolete hosts.h file under drivers/scsi.
Signed-off-by: NHenrik Kretzschmar <henne@nachtwindheim.de>
Signed-off-by: NJames Bottomley <James.Bottomley@SteelEye.com>
      de77aaff
  9. 04 10月, 2006 1 次提交
  11. 01 10月, 2006 1 次提交
  13. 03 7月, 2006 1 次提交
  15. 01 7月, 2006 1 次提交
  17. 27 6月, 2006 1 次提交
  19. 10 6月, 2006 1 次提交
  21. 06 6月, 2006 1 次提交
  23. 29 3月, 2006 1 次提交
  25. 28 2月, 2006 1 次提交
  27. 01 2月, 2006 1 次提交
  29. 26 1月, 2006 1 次提交
  31. 15 1月, 2006 1 次提交
  33. 10 11月, 2005 2 次提交
  35. 07 11月, 2005 2 次提交
  37. 05 11月, 2005 1 次提交
  39. 01 11月, 2005 1 次提交
    • J
      [SCSI] ips: Fix initialization bug with kdump · ee807c2d
      由 Jack Hammer 提交于 
      If I/O is active on the adapter, and an unexpected interrupt is pending
during initialization, the driver blows it's brains out. Since the driver
didn't initiate the I/O, the data in it's internal tables will contain NULL
pointers.

When this condition is detected, a "flush cache and reset" is performed.
The flush cache allows any pending "lazy writes" that the adapter is
processing to complete ( a "must have" for a RAID adapter ) and the reset
puts the adapter back into a known, good state.
Signed-off-by: NJack Hammer <jack_hammer@adaptec.com>
Signed-off-by: NJames Bottomley <James.Bottomley@SteelEye.com>
      ee807c2d
  41. 29 10月, 2005 2 次提交
  43. 02 8月, 2005 1 次提交
  45. 18 6月, 2005 2 次提交
  47. 19 4月, 2005 2 次提交
  49. 17 4月, 2005 2 次提交
    • [PATCH] scsi: remove meaningless scsi_cmnd->serial_number_at_timeout field · 84011ae8
      由 提交于 
      scsi_cmnd->serial_number_at_timeout doesn't serve any purpose
anymore.  All serial_number == serial_number_at_timeout tests
are always true in abort callbacks.  Kill the field.  Also, as
->pid always equals ->serial_number and ->serial_number
doesn't have any special meaning anymore, update comments
above ->serial_number accordingly.  Once we remove all uses of
this field from all lldd's, this field should go.
Signed-off-by: NTejun Heo <htejun@gmail.com>
Signed-off-by: NJames Bottomley <James.Bottomley@SteelEye.com>
      84011ae8
    • L
      Linux-2.6.12-rc2 · 1da177e4
      由 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