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* Various drivers' irq handlers: kill dead code, needless castsJeff Garzik2006-10-061-1/+1
| | | | | | | | | | | | | | | | - Eliminate casts to/from void* - Eliminate checks for conditions that never occur. These typically fall into two classes: 1) Checking for 'dev_id == NULL', then it is never called with NULL as an argument. 2) Checking for invalid irq number, when the only caller (the system) guarantees the irq handler is called with the proper 'irq' number argument. Signed-off-by: Jeff Garzik <jeff@garzik.org>
* IRQ: Maintain regs pointer globally rather than passing to IRQ handlersDavid Howells2006-10-051-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 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)
* [PATCH] irq-flags: misc drivers: Use the new IRQF_ constantsThomas Gleixner2006-07-021-2/+2
| | | | | | | | | Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: Ingo Molnar <mingo@elte.hu> Cc: "David S. Miller" <davem@davemloft.net> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] pcmcia: at91_cf suspend/resume/wakeupDavid Brownell2006-06-301-16/+59
| | | | | | | | | | | | | | | | | AT91 CF updates, mostly for power management: - Add suspend/resume methods to the AT91 CF driver, disabling non-wakeup IRQs during system suspend. The card detect IRQ serves as a wakeup event source. - Convert the driver to the more-current "platform_driver" style. So inserting or removing a CF card will wake the system, unless that has been disabled by updating the sysfs file; and there will be no more warnings about spurious IRQs during suspend/resume cycles. Signed-off-by: David Brownell <dbrownell@users.sourceforge.net> Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>
* Fix AT91RM9200 build breakageDavid Brownell2006-04-141-20/+31
| | | | | | | | | | | | | The at91_cf driver got out of sync with certain changes in the PCMCIA layer, notably getting rid of some duplication of data ... causing the version merged to kernel.org to fail compiling. This patch gives the at91_cf platform device a new iomem resource, using it so this new pcmcia scheme works. It also cleans up some whitepsace bugs that have accumulated over time (mostly too-long lines). Signed-off-by: David Brownell <dbrownell@users.sourceforge.net> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] pcmcia: AT91RM9200 Compact Flash driverAndrew Victor2006-03-311-0/+365
This patch adds support for the Compact Flash controller integrated in the Atmel AT91RM9200 processor. Signed-off-by: Andrew Victor <andrew@sanpeople.com Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>