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)
* 'upstream-linus' of master.kernel.org:/pub/scm/linux/kernel/git/jgarzik/netdev-2.6: (37 commits)
[netdrvr] hp100: encapsulate all non-module code
drivers/net/wireless/{airo,ipw2100}: fix error handling bugs
[netdrvr] phy: Fix bugs in error handling
[PATCH] spidernet: Use pci_dma_mapping_error()
[PATCH] sky2: version 1.9
[PATCH] sky2: fragmented receive for large MTU
[PATCH] sky2: use netif_tx_lock instead of LLTX
[PATCH] sky2: incremental transmit completion
[PATCH] sky2: name irq after eth for irqbalance
[PATCH] sky2: workarounds for some 88e806x chips
[PATCH] sky2: use standard pci register capabilties for error register
[PATCH] sky2: gigabit full duplex negotiation
e100, e1000, ixgb: increment version numbers
ixgb: convert to netdev_priv(netdev)
ixgb: combine more rx descriptors to improve performance
e1000: possible memory leak in e1000_set_ringparam
e1000: Janitor: Use #defined values for literals
e1000: don't strip vlan ID if 8021q claims it
e1000: rework polarity, NVM, eeprom code and fixes.
e1000: driver state fixes (race fix)
...
The last in-kernel user of errno is gone, so we should remove the definition
and everything referring to it. This also removes the now-unused lib/execve.c
file that was introduced earlier.
Also remove every trace of __KERNEL_SYSCALLS__ that still remained in the
kernel.
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Cc: Andi Kleen <ak@muc.de>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Richard Henderson <rth@twiddle.net>
Cc: Ivan Kokshaysky <ink@jurassic.park.msu.ru>
Cc: Russell King <rmk@arm.linux.org.uk>
Cc: Ian Molton <spyro@f2s.com>
Cc: Mikael Starvik <starvik@axis.com>
Cc: David Howells <dhowells@redhat.com>
Cc: Yoshinori Sato <ysato@users.sourceforge.jp>
Cc: Hirokazu Takata <takata.hirokazu@renesas.com>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: Kyle McMartin <kyle@mcmartin.ca>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Paul Mundt <lethal@linux-sh.org>
Cc: Kazumoto Kojima <kkojima@rr.iij4u.or.jp>
Cc: Richard Curnow <rc@rc0.org.uk>
Cc: William Lee Irwin III <wli@holomorphy.com>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Jeff Dike <jdike@addtoit.com>
Cc: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it>
Cc: Miles Bader <uclinux-v850@lsi.nec.co.jp>
Cc: Chris Zankel <chris@zankel.net>
Cc: "Luck, Tony" <tony.luck@intel.com>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Roman Zippel <zippel@linux-m68k.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
airo:
* fix oops, if !CONFIG_PROC_FS (create_proc_entry always returns NULL)
* handle pci_register_driver() failure. if it fails, we really do
want to exit, rather than (as a comment indicates) return success
because-we-are-a-library.
* #if 0 have_isa_dev variable, which is assigned a value but never used
ipw2100:
* handle sysfs_create_group() failure
* handle driver_create_file() failure
Signed-off-by: Jeff Garzik <jeff@garzik.org>
Add infrastructure to track "maximum allowable latency" for power saving
policies.
The reason for adding this infrastructure is that power management in the
idle loop needs to make a tradeoff between latency and power savings
(deeper power save modes have a longer latency to running code again). The
code that today makes this tradeoff just does a rather simple algorithm;
however this is not good enough: There are devices and use cases where a
lower latency is required than that the higher power saving states provide.
An example would be audio playback, but another example is the ipw2100
wireless driver that right now has a very direct and ugly acpi hook to
disable some higher power states randomly when it gets certain types of
error.
The proposed solution is to have an interface where drivers can
* announce the maximum latency (in microseconds) that they can deal with
* modify this latency
* give up their constraint
and a function where the code that decides on power saving strategy can
query the current global desired maximum.
This patch has a user of each side: on the consumer side, ACPI is patched
to use this, on the producer side the ipw2100 driver is patched.
A generic maximum latency is also registered of 2 timer ticks (more and you
lose accurate time tracking after all).
While the existing users of the patch are x86 specific, the infrastructure
is not. I'd like to ask the arch maintainers of other architectures if the
infrastructure is generic enough for their use (assuming the architecture
has such a tradeoff as concept at all), and the sound/multimedia driver
owners to look at the driver facing API to see if this is something they
can use.
[akpm@osdl.org: cleanups]
Signed-off-by: Arjan van de Ven <arjan@linux.intel.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Acked-by: Jesse Barnes <jesse.barnes@intel.com>
Cc: "Brown, Len" <len.brown@intel.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Fix by removing dependency between priv->action_sem and rtnl semaphore.
Signed-off-by: Zhu Yi <yi.zhu@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
From: Michal Piotrowski <michal.k.k.piotrowski@gmail.com>
Signed-off-by: Michal Piotrowski <michal.k.k.piotrowski@gmail.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
semaphore to mutexes conversion.
the conversion was generated via scripts, and the result was validated
automatically via a script as well.
build-tested.
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Zhu Yi <yi.zhu@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
Fix gcc warning: ipw2100.c:2460: ISO C90 forbids mixed declarations and code
Signed-off-by: Zhu Yi <yi.zhu@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
Signed-off-by: Stefan Rompf <stefan@loplof.de>
Signed-off-by: Andrea Merello <andreamrl at tiscali it>
Signed-off-by: Zhu Yi <yi.zhu@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
Signed-off-by: James Ketrenos <jketreno@linux.intel.com>
Signed-off-by: Zhu Yi <yi.zhu@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This patch fixes a BUG_ON for the latest ieee80211 change.
Signed-off-by: Hong Liu <hong.liu@intel.com>
Signed-off-by: Zhu Yi <yi.zhu@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This patch makes the needlessly global ipw2100_wpa_assoc_frame() static.
Signed-off-by: Adrian Bunk <bunk@stusta.de>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
The ipw2100 driver misunderstood the parameter of txpower.
Tx Power off means turn off the radio, but the driver interpret it as
"can't set txpower". So when getting the txpower, it sets disabled=1 to
the iwconifg tool in managed mode. And the tool will display "Tx Power off"
when disabled=1.
Now, in managed mode, iwconfig will not show "TX Power" if the radio is not
switched off. It will only display "Tx Power off" only if the radio is killed.
Signed-off-by: Hong Liu <hong.liu@intel.com>
Signed-off-by: Zhu Yi <yi.zhu@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
drivers/net/wireless/ipw2100.c:2236: warning: `ipw2100_match_buf' defined
but not used
Cc: Yi Zhu <yi.zhu@intel.com>
Cc: James Ketrenos <jketreno@linux.intel.com>
Cc: Jeff Garzik <jgarzik@pobox.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Zhu Yi <yi.zhu@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
WIRELESS_EXT < 18 will never be true in the kernel.
Signed-off-by: Adrian Bunk <bunk@stusta.de>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
Remove the "inline" keyword from a bunch of big functions in the kernel with
the goal of shrinking it by 30kb to 40kb
Signed-off-by: Arjan van de Ven <arjan@infradead.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Acked-by: Jeff Garzik <jgarzik@pobox.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This patch allows ipw2100 driver to advertise the WPA-related encryption
options that it does really support. It's necessary to work correctly
with NetworkManager and other programs that actually check driver & card
capabilities.
Signed-off-by: Dan Williams <dcbw@redhat.com>
Signed-off-by: Jeff Garzik <jgarzik@pobox.com>
There are currently two IPW_DEBUG options in drivers/net/wireless/Kconfig
(one for ipw2100 and one for ipw2200). The attached patch splits it into
IPW2100_DEBUG and IPW2200_DEBUG.
Signed-off-by: Brice Goglin <Brice.Goglin@ens-lyon.org>
Cc: "James P. Ketrenos" <ipw2100-admin@linux.intel.com>
Cc: Jeff Garzik <jgarzik@pobox.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Jeff Garzik <jgarzik@pobox.com>
ipw2100: Fix 'Driver using old /proc/net/wireless...' message
Wireless extensions moved the get_wireless_stats handler from being
in net_device into wireless_handler.
A prior instance of this patch resolved the issue for the ipw2200.
This one fixes it for the ipw2100.
Signed-off-by: Benoit Boissinot <benoit.boissinot@ens-lyon.org>
Signed-off-by: James Ketrenos <jketreno@linux.intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
More conversions of kmalloc/memset to kzalloc
Signed-off-by: Panagiotis Issaris <takis@issaris.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
configured.
Countermeasures default to being turned off when wpa_supplicant runs,
regardless of if TKIP is being used. They are only turned on if a TKIP
is running. The warning we were printing is therefore not needed.
Signed-off-by: James Ketrenos <jketreno@linux.intel.com>
The PF_SYNCTHREAD check was introduced to try and remain compatible with
SWSUSP2. This check is no longer needed with newer versions.
Signed-off-by: James Ketrenos <jketreno@linux.intel.com>
support wpa_supplicant with open AP. We need this to make driver_ipw
work.
driver_ext has already had the similar code with the WE-18 support
added.
Signed-off-by: James Ketrenos <jketreno@linux.intel.com>
* Added WE-18 support. This allows the use of -Dext with wpa_supplicant
> 0.4.x (thanks to Hong Liu)
* Fixed#339 problem with iwconfig set/get txpower (thanks to Hong Liu)
* Fixed#598 problem when with error messages when module loaded with
'disable=1' (thanks to Hong Liu)
* Fixed#640 problem with 'iwlist retry' now showing min/max retry
* Fixed compatibility with wpa_supplicant and the new -Dipw interface
(that included a fix for 64-bit compatibility)
* Added CFG_CRC_CHECK which allows passing through packets with bad
CRCs while in monitor mode.
Signed-off-by: James Ketrenos <jketreno@linux.intel.com>
tree ee48cbe413b795d6be454b9baf4f3bd3d74814cb
parent 49856b147763bd6847e0d8f53aee1ddd61385638
author James Ketrenos <jketreno@linux.intel.com> 1126716634 -0500
committer James Ketrenos <jketreno@linux.intel.com> 1127316024 -0500
Updated ipw2100 to be compatible with ieee80211's hard_start_xmit change.
Signed-off-by: James Ketrenos <jketreno@linux.intel.com>
Signed-off-by: Jeff Garzik <jgarzik@pobox.com>
tree 992b203395c50342f1cced415acae6177344e270
parent c59bb604a2ff4e40232ff0422e7adc44e3b007a0
author James Ketrenos <jketreno@linux.intel.com> 1126714006 -0500
committer James Ketrenos <jketreno@linux.intel.com> 1127315910 -0500
Updated ipw2100 to be compatible with ieee80211_hdr changes.
Signed-off-by: James Ketrenos <jketreno@linux.intel.com>
Signed-off-by: Jeff Garzik <jgarzik@pobox.com>
Use schedule_timeout_interruptible() instead of
set_current_state()/schedule_timeout() to reduce kernel size.
Signed-off-by: Nishanth Aravamudan <nacc@us.ibm.com>
Cc: Jeff Garzik <jgarzik@pobox.com>
Cc: "David S. Miller" <davem@davemloft.net>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Jeff Garzik <jgarzik@pobox.com>
David Howells