Skip to content

R
raspberrypi-kernel

openeuler / raspberrypi-kernel

通知 13
Star 1
Fork 0
R
raspberrypi-kernel
切换分支/标签
  1. 02 12月, 2006 1 次提交
  3. 07 10月, 2006 1 次提交
  5. 05 10月, 2006 1 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
  7. 14 9月, 2006 1 次提交
  9. 12 9月, 2006 1 次提交
    • A
      [PATCH] Remove more unnecessary driver printk's · d5b20697
      由 Andy Gospodarek 提交于 
      As I promised last week, here is the first pass at removing all
unnecessary printk's that exist in network device drivers currently in
promiscuous mode.  The duplicate messages are not needed so they have
been removed.  Some of these drivers are quite old and might not need an
update, but I did them all anyway.

I am currently auditing the remaining conditional printk's and will send
out a patch for those soon.
Signed-off-by: NAndy Gospodarek <andy@greyhouse.net>
Signed-off-by: NJeff Garzik <jeff@garzik.org>
      d5b20697
  11. 24 8月, 2006 1 次提交
  13. 20 8月, 2006 1 次提交
  15. 09 8月, 2006 1 次提交
  17. 03 7月, 2006 1 次提交
  19. 01 7月, 2006 1 次提交
  21. 27 6月, 2006 1 次提交
  23. 23 6月, 2006 2 次提交
    • H
      [NET]: Avoid allocating skb in skb_pad · 5b057c6b
      由 Herbert Xu 提交于 
      First of all it is unnecessary to allocate a new skb in skb_pad since
the existing one is not shared.  More importantly, our hard_start_xmit
interface does not allow a new skb to be allocated since that breaks
requeueing.

This patch uses pskb_expand_head to expand the existing skb and linearize
it if needed.  Actually, someone should sift through every instance of
skb_pad on a non-linear skb as they do not fit the reasons why this was
originally created.

Incidentally, this fixes a minor bug when the skb is cloned (tcpdump,
TCP, etc.).  As it is skb_pad will simply write over a cloned skb.  Because
of the position of the write it is unlikely to cause problems but still
it's best if we don't do it.
Signed-off-by: NHerbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>
      5b057c6b
    • E
      [PATCH] Remove useless check in drivers/net/pcmcia/xirc2ps_cs.c · da4f5ccf
      由 Eric Sesterhenn 提交于 
      hi,

coverity choked at this check (id #223), assuming that
skb might be NULL and used anyways later. Since
start_hard_xmit() always gets called with a valid
skb, the check is useless and this patch removes it.
Signed-off-by: NEric Sesterhenn <snakebyte@gmx.de>
Signed-off-by: NJeff Garzik <jeff@garzik.org>
      da4f5ccf
  25. 06 6月, 2006 1 次提交
  27. 24 5月, 2006 2 次提交
  29. 20 5月, 2006 1 次提交
  31. 22 4月, 2006 1 次提交
  33. 13 4月, 2006 1 次提交
  35. 01 4月, 2006 1 次提交
    • O
      [PATCH] Don't pass boot parameters to argv_init[] · 9b41046c
      由 OGAWA Hirofumi 提交于 
      The boot cmdline is parsed in parse_early_param() and
parse_args(,unknown_bootoption).

And __setup() is used in obsolete_checksetup().

	start_kernel()
		-> parse_args()
			-> unknown_bootoption()
				-> obsolete_checksetup()

If __setup()'s callback (->setup_func()) returns 1 in
obsolete_checksetup(), obsolete_checksetup() thinks a parameter was
handled.

If ->setup_func() returns 0, obsolete_checksetup() tries other
->setup_func().  If all ->setup_func() that matched a parameter returns 0,
a parameter is seted to argv_init[].

Then, when runing /sbin/init or init=app, argv_init[] is passed to the app.
If the app doesn't ignore those arguments, it will warning and exit.

This patch fixes a wrong usage of it, however fixes obvious one only.
Signed-off-by: NOGAWA Hirofumi <hirofumi@mail.parknet.co.jp>
Signed-off-by: NAndrew Morton <akpm@osdl.org>
Signed-off-by: NLinus Torvalds <torvalds@osdl.org>
      9b41046c
  37. 31 3月, 2006 10 次提交
  39. 30 3月, 2006 1 次提交
  41. 04 3月, 2006 2 次提交
  43. 01 3月, 2006 1 次提交
    • J
      [PATCH] pcmcia: add id for AMB8110 PC Card · 2fe22a8b
      由 Jesse Allen 提交于 
      The axnet_cs driver can support the AMB8110 PC Card, so add the id for it.

In the old pcmcia-cs config file, this card is listed with the comment "not
specific enough".  The last entry in the axnet_ids has the same comment.
They are disabled, and for good reason as it was originally identified by
the MANFID, and that is shared with several cards that use both the
pcnet_cs driver and axnet_cs driver.  I tried my AMB8110 with pcnet_cs, and
found that it works fine, and I cannot find a reason for either, except
that the old config file recommended axnet_cs.
Signed-off-by: NJesse Allen <the3dfxdude@gmail.com>
Cc: Jeff Garzik <jgarzik@pobox.com>
Signed-off-by: NAndrew Morton <akpm@osdl.org>
Signed-off-by: NDominik Brodowski <linux@dominikbrodowski.net>
      2fe22a8b
  45. 17 1月, 2006 1 次提交
  47. 10 1月, 2006 1 次提交
  49. 06 1月, 2006 4 次提交