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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
..
arc Don't include linux/config.h from anywhere else in include/ 2006-04-26 12:56:16 +01:00
ddb5xxx Merge git://git.infradead.org/hdrcleanup-2.6 2006-06-20 15:10:08 -07:00
dec Don't include linux/config.h from anywhere else in include/ 2006-04-26 12:56:16 +01:00
emma2rh [MIPS] Support for the R5500-based NEC EMMA2RH Mark-eins board 2006-06-19 17:39:26 +01:00
ip32 Don't include linux/config.h from anywhere else in include/ 2006-04-26 12:56:16 +01:00
jmr3927 Don't include linux/config.h from anywhere else in include/ 2006-04-26 12:56:16 +01:00
lasat
mach-atlas [MIPS] Atlas: update interrupt handling 2006-09-27 13:37:42 +01:00
mach-au1x00 [PATCH] Alchemy: Delete unused pt_regs * argument from au1xxx_dbdma_chan_alloc 2006-09-26 08:48:54 -07:00
mach-cobalt [MIPS] Use the proper technical term for naming some of the cache macros. 2006-07-13 21:26:04 +01:00
mach-db1x00 [PATCH] Au1550/1200: add missing PSC #define's, make OSS driver use the proper ones 2006-06-23 07:42:56 -07:00
mach-dec [PATCH] char/rtc: Handle memory-mapped chips properly 2006-07-10 13:24:25 -07:00
mach-emma2rh [MIPS] Support for the R5500-based NEC EMMA2RH Mark-eins board 2006-06-19 17:39:26 +01:00
mach-ev64120 [MIPS] Add UART IRQ number for EV64120 2006-10-01 23:16:59 +01:00
mach-excite [MIPS] s/__ASSEMBLER__/__ASSEMBLY__/ for clarity sake. 2006-09-27 13:37:57 +01:00
mach-generic [PATCH] irq-flags: MIPS: Use the new IRQF_ constants 2006-07-02 13:58:47 -07:00
mach-ip22 Merge git://git.infradead.org/hdrcleanup-2.6 2006-06-20 15:10:08 -07:00
mach-ip27 [PATCH] sched: introduce child field in sched_domain 2006-10-03 08:04:06 -07:00
mach-ip32 Merge git://git.infradead.org/hdrcleanup-2.6 2006-06-20 15:10:08 -07:00
mach-ja [MIPS] Use the proper technical term for naming some of the cache macros. 2006-07-13 21:26:04 +01:00
mach-jazz [PATCH] irq-flags: MIPS: Use the new IRQF_ constants 2006-07-02 13:58:47 -07:00
mach-jmr3927 [MIPS] JMR3927 build fixes for the RTC code. 2006-04-19 04:14:20 +02:00
mach-lasat
mach-mips [MIPS] Use the proper technical term for naming some of the cache macros. 2006-07-13 21:26:04 +01:00
mach-ocelot
mach-ocelot3 [MIPS] Use the proper technical term for naming some of the cache macros. 2006-07-13 21:26:04 +01:00
mach-pb1x00 Don't include linux/config.h from anywhere else in include/ 2006-04-26 12:56:16 +01:00
mach-pnx8550 [MIPS] PNX8550 fixups 2006-10-04 18:06:15 +01:00
mach-qemu [MIPS] Qemu does not have D-cache aliases 2006-09-27 13:37:49 +01:00
mach-rm200 [MIPS] Fix R4K cache macro names 2006-06-19 17:39:26 +01:00
mach-sibyte [MIPS] Use the proper technical term for naming some of the cache macros. 2006-07-13 21:26:04 +01:00
mach-sim [MIPS] Use the proper technical term for naming some of the cache macros. 2006-07-13 21:26:04 +01:00
mach-wrppmc [MIPS] Wind River 4KC PPMC Eval Board Support 2006-06-19 17:39:18 +01:00
mach-yosemite [MIPS] Use the proper technical term for naming some of the cache macros. 2006-07-13 21:26:04 +01:00
mips-boards [MIPS] Atlas: update interrupt handling 2006-09-27 13:37:42 +01:00
pci [MIPS] SN: include asm/sn/types.h for nasid_t. 2006-06-19 17:39:24 +01:00
sgi
sibyte [MIPS] s/__ASSEMBLER__/__ASSEMBLY__/ for clarity sake. 2006-09-27 13:37:57 +01:00
sn [MIPS] Remove BSD and Sys V compat data types. 2006-06-29 21:10:54 +01:00
tx4927 Don't include linux/config.h from anywhere else in include/ 2006-04-26 12:56:16 +01:00
tx4938 fix file specification in comments 2006-10-03 23:01:26 +02:00
vr41xx [MIPS] vr41xx: Update workpad setup function 2006-07-13 21:26:21 +01:00
xtalk
8253pit.h
a.out.h Don't include linux/config.h from anywhere else in include/ 2006-04-26 12:56:16 +01:00
abi.h
addrspace.h Merge git://git.infradead.org/hdrcleanup-2.6 2006-06-20 15:10:08 -07:00
apm.h [MIPS] Don't include obsolete <linux/config.h>. 2006-07-13 21:25:58 +01:00
asm.h Don't include linux/config.h from anywhere else in include/ 2006-04-26 12:56:16 +01:00
asmmacro-32.h [MIPS] Fix fpu_save_double on 64-bit. 2006-06-19 17:39:13 +01:00
asmmacro-64.h [MIPS] Fix fpu_save_double on 64-bit. 2006-06-19 17:39:13 +01:00
asmmacro.h [MIPS] Fix use of ehb instruction for non-R2 configurations. 2006-06-29 21:10:49 +01:00
atomic.h [MIPS] TRACE_IRQFLAGS_SUPPORT support. 2006-07-13 21:26:09 +01:00
auxvec.h
bcache.h Don't include linux/config.h from anywhere else in include/ 2006-04-26 12:56:16 +01:00
bitops.h [MIPS] TRACE_IRQFLAGS_SUPPORT support. 2006-07-13 21:26:09 +01:00
bootinfo.h [MIPS] Remove IT8172-based platforms, ITE 8172G and Globespan IVR support. 2006-10-03 17:59:17 +01:00
branch.h
break.h
bug.h Don't include linux/config.h from anywhere else in include/ 2006-04-26 12:56:16 +01:00
bugs.h Don't include linux/config.h from anywhere else in include/ 2006-04-26 12:56:16 +01:00
byteorder.h Don't include linux/config.h from anywhere else in include/ 2006-04-26 12:56:16 +01:00
cache.h Don't include linux/config.h from anywhere else in include/ 2006-04-26 12:56:16 +01:00
cachectl.h
cacheflush.h [MIPS] Remove __flush_icache_page 2006-10-01 23:16:58 +01:00
cacheops.h
checksum.h Don't include linux/config.h from anywhere else in include/ 2006-04-26 12:56:16 +01:00
compat.h [PATCH] N32 sigset and __COMPAT_ENDIAN_SWAP__ 2006-06-25 10:01:15 -07:00
compiler.h
cpu-features.h [MIPS] Use the proper technical term for naming some of the cache macros. 2006-07-13 21:26:04 +01:00
cpu-info.h Don't include linux/config.h from anywhere else in include/ 2006-04-26 12:56:16 +01:00
cpu.h [MIPS] Use the proper technical term for naming some of the cache macros. 2006-07-13 21:26:04 +01:00
cputime.h
current.h
debug.h Don't include linux/config.h from anywhere else in include/ 2006-04-26 12:56:16 +01:00
delay.h Merge git://git.infradead.org/hdrcleanup-2.6 2006-06-20 15:10:08 -07:00
div64.h
dma-mapping.h
dma.h Don't include linux/config.h from anywhere else in include/ 2006-04-26 12:56:16 +01:00
ds1286.h
ds1742.h [MIPS] JMR3927 build fixes for the RTC code. 2006-04-19 04:14:20 +02:00
dsp.h
elf.h Don't include linux/config.h from anywhere else in include/ 2006-04-26 12:56:16 +01:00
emergency-restart.h
errno.h
fcntl.h [MIPS] Remove F_SETSIG and F_GETSIG in favor of the asm-generic definitions. 2006-09-27 13:37:48 +01:00
fixmap.h [MIPS] Fix FIXADDR_TOP for TX39/TX49. 2006-06-29 21:10:52 +01:00
floppy.h
fpregdef.h
fpu_emulator.h [MIPS] Unify mips_fpu_soft_struct and mips_fpu_hard_structs. 2006-06-19 17:39:18 +01:00
fpu.h Merge git://git.infradead.org/hdrcleanup-2.6 2006-06-20 15:10:08 -07:00
futex.h Merge git://git.infradead.org/hdrcleanup-2.6 2006-06-20 15:10:08 -07:00
gdb-stub.h
gfx.h
gt64120.h
gt64240.h
hardirq.h
hazards.h [MIPS] s/__ASSEMBLER__/__ASSEMBLY__/ for clarity sake. 2006-09-27 13:37:57 +01:00
highmem.h Don't include linux/config.h from anywhere else in include/ 2006-04-26 12:56:16 +01:00
hw_irq.h [PATCH] genirq: add ->retrigger() irq op to consolidate hw_irq_resend() 2006-06-29 10:26:23 -07:00
i8259.h
ide.h
inst.h [MIPS] Fix rdhwr_op definition. 2006-07-13 21:26:08 +01:00
inventory.h
io.h Don't include linux/config.h from anywhere else in include/ 2006-04-26 12:56:16 +01:00
ioctl.h
ioctls.h
ipc.h
ipcbuf.h
irq_cpu.h
irq_regs.h IRQ: Maintain regs pointer globally rather than passing to IRQ handlers 2006-10-05 15:10:12 +01:00
irq.h [MIPS] Cleanup leftovers of ARCH_HAS_IRQ_PER_CPU 2006-09-27 13:37:29 +01:00
irqflags.h [MIPS] lockdep: fix TRACE_IRQFLAGS_SUPPORT 2006-10-01 23:16:57 +01:00
isadep.h Don't include linux/config.h from anywhere else in include/ 2006-04-26 12:56:16 +01:00
jazz.h
jazzdma.h
Kbuild [MIPS] Have headers_install install <asm/cachectl.h> and <asm/sysmips.h>. 2006-09-27 13:37:56 +01:00
kmap_types.h Don't include linux/config.h from anywhere else in include/ 2006-04-26 12:56:16 +01:00
kspd.h [MIPS] kpsd and other AP/SP improvements. 2006-04-19 04:14:27 +02:00
linkage.h [PATCH] abstract type/size specification for assembly 2006-03-24 07:33:25 -08:00
local.h Don't include linux/config.h from anywhere else in include/ 2006-04-26 12:56:16 +01:00
m48t35.h
m48t37.h
marvell.h [MIPS] MV6434x: Add prototype of interrupt dispatch function. 2006-04-19 04:14:20 +02:00
mc146818-time.h [PATCH] RTC: Remove RTC UIP synchronization on MIPS MC146818 2006-03-28 09:16:00 -08:00
mc146818rtc.h
mips_mt.h [MIPS] MT: Improved multithreading support. 2006-04-19 04:14:28 +02:00
mipsmtregs.h [MIPS] MT: Improved multithreading support. 2006-04-19 04:14:28 +02:00
mipsprom.h
mipsregs.h [MIPS] vr41xx: Replace magic number for P4K bit with symbol. 2006-07-13 21:26:11 +01:00
mman.h
mmu_context.h [MIPS] Reformat missformated SMTC bits. 2006-09-27 13:37:49 +01:00
mmu.h
mmzone.h [PATCH] Delete unused definitions of kvaddr_to_nid 2006-06-23 07:42:52 -07:00
module.h Don't include linux/config.h from anywhere else in include/ 2006-04-26 12:56:16 +01:00
msc01_ic.h
msgbuf.h Don't include linux/config.h from anywhere else in include/ 2006-04-26 12:56:16 +01:00
mutex.h
namei.h
nile4.h
paccess.h Don't include linux/config.h from anywhere else in include/ 2006-04-26 12:56:16 +01:00
page.h [MIPS] Do not lose upper 32-bit on MIPS32 with 64-bit addresses in __pte(). 2006-09-27 13:37:39 +01:00
param.h [MIPS] Make timer interrupt frequency configurable from kconfig. 2006-06-19 17:39:27 +01:00
parport.h
pci.h Don't include linux/config.h from anywhere else in include/ 2006-04-26 12:56:16 +01:00
percpu.h
pgalloc.h Don't include linux/config.h from anywhere else in include/ 2006-04-26 12:56:16 +01:00
pgtable-32.h [PATCH] Standardize pxx_page macros 2006-09-26 08:48:51 -07:00
pgtable-64.h [MIPS] Fix USER_PTRS_PER_PGD for 64K page size. 2006-09-27 13:37:52 +01:00
pgtable-bits.h Don't include linux/config.h from anywhere else in include/ 2006-04-26 12:56:16 +01:00
pgtable.h [PATCH] Standardize pxx_page macros 2006-09-26 08:48:51 -07:00
pmon.h
poll.h [PATCH] POLLRDHUP/EPOLLRDHUP handling for half-closed devices notifications 2006-03-25 08:22:56 -08:00
posix_types.h
prctl.h
prefetch.h Don't include linux/config.h from anywhere else in include/ 2006-04-26 12:56:16 +01:00
processor.h Merge git://git.infradead.org/hdrcleanup-2.6 2006-06-20 15:10:08 -07:00
ptrace.h [MIPS] Let gcc align 'struct pt_regs' on 8 bytes boundary 2006-10-03 17:59:17 +01:00
qemu.h [MIPS] Qemu system shutdown support 2006-06-19 17:39:19 +01:00
r4kcache.h [MIPS] MT: Improved multithreading support. 2006-04-19 04:14:28 +02:00
reboot.h
reg.h Don't include linux/config.h from anywhere else in include/ 2006-04-26 12:56:16 +01:00
regdef.h
resource.h Don't include linux/config.h from anywhere else in include/ 2006-04-26 12:56:16 +01:00
rm9k-ocd.h [MIPS] Support for the RM9000-based Basler eXcite smart camera platform. 2006-06-19 17:39:26 +01:00
rtc.h [MIPS] Fix genrtc compilation. 2006-04-19 04:14:22 +02:00
rtlx.h [MIPS] kpsd and other AP/SP improvements. 2006-04-19 04:14:27 +02:00
scatterlist.h
sections.h
segment.h
semaphore.h
sembuf.h
serial.h [MIPS] Remove IT8172-based platforms, ITE 8172G and Globespan IVR support. 2006-10-03 17:59:17 +01:00
setup.h
sgialib.h
sgiarcs.h Don't include linux/config.h from anywhere else in include/ 2006-04-26 12:56:16 +01:00
sgidefs.h
shmbuf.h
shmparam.h
sigcontext.h [MIPS] Update struct sigcontext member names 2006-06-01 00:28:31 +01:00
siginfo.h Don't include linux/config.h from anywhere else in include/ 2006-04-26 12:56:16 +01:00
signal.h [MIPS] Move definition of IRIX compat constant into IRIX compat code. 2006-09-27 13:37:45 +01:00
sim.h Don't include linux/config.h from anywhere else in include/ 2006-04-26 12:56:16 +01:00
smp.h Merge git://git.infradead.org/hdrcleanup-2.6 2006-06-20 15:10:08 -07:00
smtc_ipi.h [MIPS] MT: Improved multithreading support. 2006-04-19 04:14:28 +02:00
smtc_proc.h [MIPS] MT: Improved multithreading support. 2006-04-19 04:14:28 +02:00
smtc.h [MIPS] MT: Improved multithreading support. 2006-04-19 04:14:28 +02:00
sni.h [MIPS] Support SNI RM200C SNI in big endian mode and R5000 processors. 2006-06-19 17:39:24 +01:00
socket.h [AF_UNIX]: Datagram getpeersec 2006-06-29 16:58:06 -07:00
sockios.h
sparsemem.h [MIPS] Fix sparsemem support. 2006-06-06 00:15:20 +01:00
spinlock_types.h
spinlock.h [PATCH] Directed yield: cpu_relax variants for spinlocks and rw-locks 2006-10-01 00:39:21 -07:00
stackframe.h [MIPS] Fix use of ehb instruction for non-R2 configurations. 2006-06-29 21:10:49 +01:00
stacktrace.h [MIPS] Make unwind_stack() can dig into interrupted context 2006-10-01 23:16:59 +01:00
stat.h
statfs.h
string.h Don't include linux/config.h from anywhere else in include/ 2006-04-26 12:56:16 +01:00
suspend.h
sysmips.h
system.h [PATCH] remove set_wmb - arch removal 2006-07-14 21:56:14 -07:00
termbits.h
termios.h
thread_info.h Don't include linux/config.h from anywhere else in include/ 2006-04-26 12:56:16 +01:00
time.h IRQ: Maintain regs pointer globally rather than passing to IRQ handlers 2006-10-05 15:10:12 +01:00
timex.h [MIPS] Fix errors detected by "make headers_check" 2006-09-27 13:37:40 +01:00
titan_dep.h
tlb.h
tlbdebug.h
tlbflush.h Don't include linux/config.h from anywhere else in include/ 2006-04-26 12:56:16 +01:00
topology.h
traps.h
tx3912.h
types.h Don't include linux/config.h from anywhere else in include/ 2006-04-26 12:56:16 +01:00
uaccess.h Don't include linux/config.h from anywhere else in include/ 2006-04-26 12:56:16 +01:00
ucontext.h
unaligned.h
unistd.h [PATCH] remove remaining errno and __KERNEL_SYSCALLS__ references 2006-10-02 07:57:23 -07:00
user.h [MIPS] Fix errors detected by "make headers_check" 2006-09-27 13:37:40 +01:00
vga.h [PATCH] vgacon: make VGA_MAP_MEM take size, remove extra use 2006-06-22 15:05:58 -07:00
vpe.h [MIPS] kpsd and other AP/SP improvements. 2006-04-19 04:14:27 +02:00
war.h Merge git://git.infradead.org/hdrcleanup-2.6 2006-06-20 15:10:08 -07:00
watch.h
wbflush.h Don't include linux/config.h from anywhere else in include/ 2006-04-26 12:56:16 +01:00
xor.h
xxs1500.h