Commit Graph

16 Commits

Author SHA1 Message Date
David Howells 7d12e780e0 IRQ: Maintain regs pointer globally rather than passing to IRQ handlers
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 <dhowells@redhat.com>
(cherry picked from 1b16e7ac850969f38b375e511e3fa2f474a33867 commit)
2006-10-05 15:10:12 +01:00
Pavel Roskin 821fe6831c [PATCH] orinoco: Don't use "extern inline" on locking functions
SPARC architecture has been fixed, so it's no longer needed.

Signed-off-by: Pavel Roskin <proski@gnu.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
2006-08-29 17:06:29 -04:00
Pavel Roskin f298a2ec62 [PATCH] orinoco: bump version to 0.15
Signed-off-by: Pavel Roskin <proski@gnu.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
2006-04-24 16:15:52 -04:00
Pavel Roskin a28dc81dcd [PATCH] orinoco: simplify 802.3 encapsulation code
Use skb_pull() to strip the addresses from the original packet.  Don't
strip protocol bytes.

Signed-off-by: Pavel Roskin <proski@gnu.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
2006-04-24 16:15:51 -04:00
Pavel Roskin 65b1fe7df7 [PATCH] orinoco: remove tracing code, it's unused
Signed-off-by: Pavel Roskin <proski@gnu.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
2006-04-24 16:15:49 -04:00
Olaf Hering 733482e445 [PATCH] changing CONFIG_LOCALVERSION rebuilds too much, for no good reason
This patch removes almost all inclusions of linux/version.h.  The 3
#defines are unused in most of the touched files.

A few drivers use the simple KERNEL_VERSION(a,b,c) macro, which is
unfortunatly in linux/version.h.

There are also lots of #ifdef for long obsolete kernels, this was not
touched.  In a few places, the linux/version.h include was move to where
the LINUX_VERSION_CODE was used.

quilt vi `find * -type f -name "*.[ch]"|xargs grep -El '(UTS_RELEASE|LINUX_VERSION_CODE|KERNEL_VERSION|linux/version.h)'|grep -Ev '(/(boot|coda|drm)/|~$)'`

search pattern:
/UTS_RELEASE\|LINUX_VERSION_CODE\|KERNEL_VERSION\|linux\/\(utsname\|version\).h

Signed-off-by: Olaf Hering <olh@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-11-09 07:55:57 -08:00
Pavel Roskin acc4b985a6 [PATCH] orinoco: Bump version to 0.15rc3.
Signed-off-by: Pavel Roskin <proski@gnu.org>

Bump version to 0.15rc3.
Signed-off-by: Jeff Garzik <jgarzik@pobox.com>
2005-09-23 04:36:14 -04:00
Pavel Roskin d133ae4cd6 [PATCH] orinoco: Annotate endianess of variables and structure members.
Signed-off-by: Pavel Roskin <proski@gnu.org>

Annotate endianess of variables and structure members.

Don't reuse variables for both host-endian and little-endian data.
Minor comment changes in affected structures.
Signed-off-by: Jeff Garzik <jgarzik@pobox.com>
2005-09-23 04:36:13 -04:00
Pavel Roskin ef846bf04f [PATCH] orinoco: Remove inneeded system includes.
Signed-off-by: Pavel Roskin <proski@gnu.org>

Remove inneeded system includes.

Most system includes are not needed.  In particular, the hardware
backends don't need anything network related.  Some includes have been
moved from local headers to the C files where they are actually used.
Includes that have to be in the local headers are no longer from the C
sources.
Signed-off-by: Jeff Garzik <jgarzik@pobox.com>
2005-09-23 04:36:13 -04:00
Pavel Roskin 343c686c04 [PATCH] orinoco: WE-18 support
Author: Jean Tourrilhes <jt@hpl.hp.com>
Signed-off-by: Pavel Roskin <proski@gnu.org>

Use new Wireless Extension API for wireless stats.
Signed-off-by: Jeff Garzik <jgarzik@pobox.com>
2005-09-14 08:30:54 -04:00
Jeff Garzik 1a9fe638eb wireless/orinoco: remove changelog, bump version 2005-06-27 00:27:07 -04:00
Christoph Hellwig 98c4cae1da [PATCH] orinoco: monitor mode support
Patch from Pavel Roskin
2005-06-27 00:23:55 -04:00
Christoph Hellwig 95dd91fbd8 [PATCH] orinoco: scanning support
Patch from Pavel Roskin
2005-06-27 00:23:55 -04:00
Christoph Hellwig 16739b065f [PATCH] orinoco: manual roaming for Symbol and Intersilfirmware
Patch from Pavel Roskin
2005-06-27 00:23:55 -04:00
Christoph Hellwig ad8f451b41 [PATCH] orinoco: make orinoco_stop() static
Patch from Pavel Roskin

Index: linux-2.6/drivers/net/wireless/orinoco.c
===================================================================
2005-05-15 17:53:26 -04:00
Linus Torvalds 1da177e4c3 Linux-2.6.12-rc2
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!
2005-04-16 15:20:36 -07:00