linux-toradex.git/drivers/net/appletalk, branch v2.6.19.2

IRQ: Maintain regs pointer globally rather than passing to IRQ handlers

2006-10-05T14:10:12+00:00

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: David Howells 
(cherry picked from 1b16e7ac850969f38b375e511e3fa2f474a33867 commit)

[ATALK]: endianness annotations

2006-09-29T00:53:58+00:00

Signed-off-by: Al Viro 
Signed-off-by: David S. Miller

[PATCH] cops section fix

2006-08-19T21:40:15+00:00

WARNING: drivers/net/appletalk/cops.o - Section mismatch: reference to .init.text:cops_probe from .text between 'init_module' (at offset 0xae) and 'cops_rx'

Cc: "David S. Miller" 
Signed-off-by: Andrew Morton 
Signed-off-by: Jeff Garzik

[ATALK]: Make CONFIG_DEV_APPLETALK a tristate.

2006-08-02T20:38:17+00:00

Otherwise we allow building appletalk drivers in-kernel when
CONFIG_ATALK is modular.  That doesn't work because these drivers use
symbols such as "alloc_talkdev" which is exported from code built
by CONFIG_ATALK.

Noticed by Toralf Förster.

Signed-off-by: David S. Miller

Remove obsolete #include

2006-06-30T17:25:36+00:00

Signed-off-by: Jörn Engel 
Signed-off-by: Adrian Bunk

[APPLETALK]: warning fix

2006-02-13T23:53:41+00:00

drivers/net/appletalk/cops.c: In function `cops_load':
drivers/net/appletalk/cops.c:539: warning: assignment discards qualifiers from pointer target type
drivers/net/appletalk/cops.c:547: warning: assignment discards qualifiers from pointer target type

Signed-off-by: Andrew Morton 
Signed-off-by: David S. Miller

[NET]: move config options out to individual protocols

2005-07-12T04:13:56+00:00

Move the protocol specific config options out to the specific protocols.
With this change net/Kconfig now starts to become readable and serve as a
good basis for further re-structuring.

The menu structure is left almost intact, except that indention is
fixed in most cases. Most visible are the INET changes where several
"depends on INET" are replaced with a single ifdef INET / endif pair.

Several new files were created to accomplish this change - they are
small but serve the purpose that config options are now distributed
out where they belongs.

Signed-off-by: Sam Ravnborg 
Signed-off-by: David S. Miller

[LTPC]: Replace schedule_timeout() with ssleep()/msleep()

2005-06-23T05:19:52+00:00

Use ssleep() / msleep() [as appropriate]
instead of schedule_timeout() to guarantee the task delays as expected.

Signed-off-by: Nishanth Aravamudan 
Acked-by: Arnaldo Carvalho de Melo 
Signed-off-by: Maximilian Attems 
Signed-off-by: Domen Puncer 
Signed-off-by: David S. Miller

[PATCH] make some things static

2005-05-05T23:36:47+00:00

This patch makes some needlessly global identifiers static.

Signed-off-by: Adrian Bunk 
Acked-by: Arjan van de Ven 
Acked-by: Trond Myklebust 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

[ATALK]: Add alloc_ltalkdev().

2005-05-05T21:25:59+00:00

this matches the API used by other link layer like ethernet or token
ring.

Signed-off-by: Christoph Hellwig 
Acked-by: Arnaldo Carvalho de Melo 
Signed-off-by: David S. Miller