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Consider return values for all user space access function and
return -EFAULT on error.
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
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sscanf() could leave the interval value unchanged in which case it
would be used uninitialized.
Signed-off-by: Gerald Schaefer <geraldsc@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
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Looking at the new syscall additions, I noticed that
sys_getcpu_wrapper wraps in to sys_tee, in what appears to be
a copy and paste error. Switch it to point to sys_getcpu..
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
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The second argument to free_npages() was being incorrectly
calculated, which would thus access far past the end of the
arena->map[] bitmap.
Signed-off-by: David S. Miller <davem@davemloft.net>
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1) probe_other_fhcs() wants to see only non-central FHC
busses, so skip FHCs that don't sit off the root
2) Like SBUS, FHC can lack the appropriate address and
size cell count properties, so add an of_busses[]
entry and handlers for that.
3) Central FHC irq translator probing was buggy. We
were trying to use dp->child in irq_trans_init but
that linkage is not setup at this point.
So instead, pass in the parent of "dp" and look for
the child "fhc" with parent "central".
Thanks to the tireless assistence of Ben Collins in tracking
down these problems and testing out these fixes.
Signed-off-by: David S. Miller <davem@davemloft.net>
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Sync atstk1002_defconfig with latest git, turn off non-existent
drivers and enable a few more userspace-visible options like
SysV IPC and inotify support.
Signed-off-by: Haavard Skinnemoen <hskinnemoen@atmel.com>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
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The read[bwl] and write[bwl] functions are meant for accessing PCI
devices. How this is achieved on AVR32 is unknown, as there are no
systems with a PCI bridge available yet.
On-chip peripheral access, however, should not depend on how we end
up implementing PCI access, so using __raw_read[bwl]/__raw_write[bwl]
is the right thing to do for on-chip peripherals. This patch converts
the drivers for the static memory controller, interrupt controller,
PIO controller and system manager to use __raw MMIO access.
Signed-off-by: Haavard Skinnemoen <hskinnemoen@atmel.com>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
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Implement __raw_readsb and __raw_writesb. Export __raw_reads[bwl]
and __raw_writes[bwl] for use by modules.
Signed-off-by: Haavard Skinnemoen <hskinnemoen@atmel.com>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
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While ioremap() will happily map a physical address through the
P2 (uncached) segment when appropriate, iounmap() doesn't know how
to handle those mappings.
This patch makes iounmap() do the right thing, i.e. nothing, for
such mappings.
Signed-off-by: Haavard Skinnemoen <hskinnemoen@atmel.com>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
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Silence a few compile warnings which are basically harmless, but
easy to fix.
Signed-off-by: Haavard Skinnemoen <hskinnemoen@atmel.com>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
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Don't generate listing by default, remove unused LIBGCC variable and
rename generated disassembly and listing files to vmlinux.{s,lst}.
Also make sure that files generated during the build are actually
removed with make clean.
Signed-off-by: Haavard Skinnemoen <hskinnemoen@atmel.com>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
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* 'for-linus' of git://one.firstfloor.org/home/andi/git/linux-2.6:
[PATCH] x86-64: Only look at per_cpu data for online cpus.
[PATCH] x86-64: Simplify the vector allocator.
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master.kernel.org:/pub/scm/linux/kernel/git/paulus/powerpc
* 'merge' of master.kernel.org:/pub/scm/linux/kernel/git/paulus/powerpc:
[POWERPC] Make sure __cpu_preinit_ppc970 gets called on 970GX processors
[POWERPC] Fix CHRP platforms with only 8259
[POWERPC] IPIC: Fix spinlock recursion in set_irq_handler
[POWERPC] Fix the UCC rx/tx clock of QE
[POWERPC] cell: update defconfig
[POWERPC] spufs: fix another off-by-one bug in spufs_mbox_read
[POWERPC] spufs: fix signal2 file to report signal2
[POWERPC] Fix device_is_compatible() const warning
[POWERPC] Cell timebase bug workaround
[POWERPC] Support feature fixups in modules
[POWERPC] Support feature fixups in vdso's
[POWERPC] Support nested cpu feature sections
[POWERPC] Consolidate feature fixup code
[POWERPC] Fix hang in start_ldr if _end or _edata is unaligned
[POWERPC] Fix spelling errors in ucc_fast.c and ucc_slow.c
[POWERPC] Don't require execute perms on wrapper when building zImage.initrd
[POWERPC] Add 970GX cputable entry
[POWERPC] Fix build breakage with CONFIG_PPC32
[POWERPC] Fix compiler warning message on get_property call
[POWERPC] Simplify stolen time calculation
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* master.kernel.org:/home/rmk/linux-2.6-arm:
[ARM] 3902/1: Enable GPIO81-84 on PXA255
[ARM] Comment out missing configuration symbols
[ARM] 3898/1: corgi_bl fix module loading
[ARM] 3897/1: corgi_bl fix module compiling
[ARM] Fix breakage in 7281c248f797723f66244b7ecef204620f664648
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Add check for 970GX for __cpu_preinit_ppc970.
Signed-off-by: Olof Johansson <olof@lixom.net>
Signed-off-by: Paul Mackerras <paulus@samba.org>
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* when we have stop/sysrq/go, we get pt_regs of whatever executes
mc_work_proc(). Would be better to see what we had at the time of
interrupt that got us stop.
* stop/stop/stop..... will give stack overflow. Shouldn't allow stop
from mconsole_stop().
* stop/stop/go leaves us inside mconsole_stop() with
os_set_fd_block(req->originating_fd, 0);
reactivate_fd(req->originating_fd, MCONSOLE_IRQ);
just done by nested mconsole_stop(). Ditto.
* once we'd seen stop, there's a period when INTR commands are executed
out of order (as they should; we might have the things stuck badly
enough to never reach mconsole_stop(), but still not badly enough to
block mconsole_interrupt(); in that situation we _want_ things like
"cad" to be executed immediately). Once we enter monsole_stop(), all
INTR commands will be executed in order, mixed with PROC ones. We'd
better let user see that such change of behaviour has happened.
(Suggested by lennert).
* stack footprint of monsole_interrupt() is an atrocity; AFAICS we can
safely make struct mc_request req; static in function there.
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Acked-by: Jeff Dike <jdike@addtoit.com>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
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On CHRP platforms with only a 8259 controller, we should set the
default IRQ host to the 8259 driver's one for the IRQ probing
fallbacks to work in case the IRQ tree is incorrect (like on
Pegasos for example). Without this fix, we get a bunch of WARN_ON's
during boot.
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>
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This causes ipic_set_irq_type to set the handler directly rather
than call set_irq_handler, which causes spinlock recursion because
the lock is already held when ipic_set_irq_type is called.
I'm also not convinced that ipic_set_irq_type should be changing the
handler at all. There seem to be several controllers that don't and
several that do. Those that do would break what appears to be a common
usage of calling set_irq_chip_and_handler followed by set_irq_type, if a
non-standard handler were to be used. OTOH, irq_create_of_mapping()
doesn't set the handler, but only calls set_irq_type().
This patch gets things working in the spinlock-debugging-enabled case,
but I'm curious as to where the handler setting is ideally supposed to be
done. I don't see any documentation on set_irq_type() that clarifies
what the semantics are supposed to be.
Signed-off-by: Scott Wood <scottwood@freescale.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>
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MPC8323EMDS board ethernet interface with RMII uses the CLK16 divisor
for the rx and tx clock, but the ucc_set_qe_mux_rxtx() function doesn't
handle the CLK16 setting of the CMXUCR3 and CMXUCR4 registers. This
fixes it.
Signed-off-by: Dave Liu <daveliu@freescale.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>
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===================================================================
Signed-off-by: Paul Mackerras <paulus@samba.org>
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Currently, spufs_mbox_read transfers more bytes than requested on a
read. If you ask for four bytes, you get eight. This fixes it to
transfer the largest multiple of four bytes that is less than or equal
to the number you asked for.
Note: one nasty property of this file in spufs is that you can only
read multiples of four bytes in the first place, since there is no way
to atomically put back a few bytes into the hardware register. Thus,
reading less than four bytes returns -EINVAL. Asking for more than
four returns the largest possible multiple of four.
Signed-off-by: Arnd Bergmann <arnd.bergmann@de.ibm.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>
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This fixes the /signal2 file to actually give signal2 data.
Signed-off-by: Dwayne Grant Mcconnell <decimal@us.ibm.com>
Signed-off-by: Arnd Bergmann <arnd.bergmann@de.ibm.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>
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Fix a const'ification related warning with device_is_compatible()
and friends related to get_property() not properly having const
on it's input device node argument.
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>
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The Cell CPU timebase has an erratum. When reading the entire 64 bits
of the timebase with one mftb instruction, there is a handful of cycles
window during which one might read a value with the low order 32 bits
already reset to 0x00000000 but the high order bits not yet incremeted
by one. This fixes it by reading the timebase again until the low order
32 bits is no longer 0. That might introduce occasional latencies if
hitting mftb just at the wrong time, but no more than 70ns on a cell
blade, and that was considered acceptable.
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Acked-by: Olof Johansson <olof@lixom.net>
Signed-off-by: Paul Mackerras <paulus@samba.org>
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This patch adds support for feature fixups in modules. This involves
adding support for R_PPC64_REL64 relocs to the 64 bits module loader.
It also modifies modpost.c to ignore the powerpc fixup sections (or it
would warn when used in .init.text).
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Acked-by: Olof Johansson <olof@lixom.net>
Signed-off-by: Paul Mackerras <paulus@samba.org>
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This patch reworks the feature fixup mecanism so vdso's can be fixed up.
The main issue was that the construct:
.long label (or .llong on 64 bits)
will not work in the case of a shared library like the vdso. It will
generate an empty placeholder in the fixup table along with a reloc,
which is not something we can deal with in the vdso.
The idea here (thanks Alan Modra !) is to instead use something like:
1:
.long label - 1b
That is, the feature fixup tables no longer contain addresses of bits of
code to patch, but offsets of such code from the fixup table entry
itself. That is properly resolved by ld when building the .so's. I've
modified the fixup mecanism generically to use that method for the rest
of the kernel as well.
Another trick is that the 32 bits vDSO included in the 64 bits kernel
need to have a table in the 64 bits format. However, gas does not
support 32 bits code with a statement of the form:
.llong label - 1b (Or even just .llong label)
That is, it cannot emit the right fixup/relocation for the linker to use
to assign a 32 bits address to an .llong field. Thus, in the specific
case of the 32 bits vdso built as part of the 64 bits kernel, we are
using a modified macro that generates:
.long 0xffffffff
.llong label - 1b
Note that is assumes that the value is negative which is enforced by
the .lds (those offsets are always negative as the .text is always
before the fixup table and gas doesn't support emiting the reloc the
other way around).
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>
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There are currently two versions of the functions for applying the
feature fixups, one for CPU features and one for firmware features. In
addition, they are both in assembly and with separate implementations
for 32 and 64 bits. identify_cpu() is also implemented in assembly and
separately for 32 and 64 bits.
This patch replaces them with a pair of C functions. The call sites are
slightly moved on ppc64 as well to be called from C instead of from
assembly, though it's a very small change, and thus shouldn't cause any
problem.
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Acked-by: Olof Johansson <olof@lixom.net>
Signed-off-by: Paul Mackerras <paulus@samba.org>
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Quick fix for lack of memset(__bss_start, 0, _end-__bss_start) in
load_kernel(). If edata is unaligned, the loop will overwrite all
memory because r3 and r4 will never be equal.
Signed-off-by: Olaf Hering <olaf@aepfle.de>
Signed-off-by: Paul Mackerras <paulus@samba.org>
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When I generalized __assign_irq_vector I failed to pay attention
to what happens when you access a per cpu data structure for
a cpu that is not online. It is an undefined case making any
code that does it have undefined behavior as well.
The code still needs to be able to allocate a vector across cpus
that are not online to properly handle combinations like lowest
priority interrupt delivery and cpu_hotplug. Not that we can do
that today but the infrastructure shouldn't prevent it.
So this patch updates the places where we touch per cpu data
to only touch online cpus, it makes cpu vector allocation
an atomic operation with respect to cpu hotplug, and it updates
the cpu start code to properly initialize vector_irq so we
don't have inconsistencies.
Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
Signed-off-by: Andi Kleen <ak@suse.de>
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There is no reason to remember a per cpu position of which vector
to try. Keeping a global position is simpler and more likely to
result in a global vector allocation even if I don't need or require
it. For level triggered interrupts this means we are less likely to
acknowledge another cpus irq, and cause the level triggered irq to
harmlessly refire.
This simplification makes it easier to only access data structures
of online cpus, by having fewer special cases to deal with.
Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
Signed-off-by: Andi Kleen <ak@suse.de>
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HAS_TOUCHSCREEN_ADS7843_LH7 and HAS_TOUCHSCREEN_ADC_LH7 are referenced
but not defined in the LH7A40x configuration. Comment them out to
prevent them causing warnings.
Marc Singer said:
Feel free to remove the Kconfig lines. I'll add it back with
the rest of the config entries.
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
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A couple of missing semicolons.
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
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* git://git.kernel.org/pub/scm/linux/kernel/git/wim/linux-2.6-watchdog: (33 commits)
[WATCHDOG] remove experimental on iTCO_wdt.c
[WATCHDOG] Atmel AT91RM9200 rename.
[WATCHDOG] includes for sample watchdog program.
[WATCHDOG] watchdog/iTCO_wdt: fix bug related to gcc uninit warning
[WATCHDOG] add ich8 support to iTCO_wdt.c (patch 2)
[WATCHDOG] add ich8 support to iTCO_wdt.c
[WATCHDOG] ioremap balanced with iounmap for drivers/char/watchdog/s3c2410_wdt.c
[WATCHDOG] w83697hf/hg WDT driver - Kconfig patch
[WATCHDOG] w83697hf/hg WDT driver - autodetect patch
[WATCHDOG] w83697hf/hg WDT driver - patch 16
[WATCHDOG] w83697hf/hg WDT driver - patch 15
[WATCHDOG] w83697hf/hg WDT driver - patch 14
[WATCHDOG] w83697hf/hg WDT driver - patch 13
[WATCHDOG] w83697hf/hg WDT driver - patch 12
[WATCHDOG] w83697hf/hg WDT driver - patch 11
[WATCHDOG] w83697hf/hg WDT driver - patch 10
[WATCHDOG] w83697hf/hg WDT driver - patch 9
[WATCHDOG] w83697hf/hg WDT driver - patch 8
[WATCHDOG] w83697hf/hg WDT driver - patch 7
[WATCHDOG] w83697hf/hg WDT driver - patch 6
...
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* master.kernel.org:/pub/scm/linux/kernel/git/lethal/sh-2.6:
sh: Convert INTC2 to IRQ table registration.
sh: Updates for irq-flow-type naming changes.
sh: Add some missing board headers.
sh: Fix exception_handling_table alignment.
sh: Cleanup board header directories.
sh: Remove board-specific ide.h headers.
sh: Proper show_stack/show_trace() implementation.
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In ucc_fast.c and ucc_slow.c, "illegal" is twice spelled "illagal".
Signed-off-by: Timur Tabi <timur@freescale.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>
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Don't require that the wrapper script be executable when building
zImage.initrds. This has already been fixed for zImages.
Signed-off-by: Mark A. Greer <mgreer@mvista.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>
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970GX cputable entry from Steve Winiecki.
Signed-off-by: Jake Moilanen <moilanen@austin.ibm.com>
arch/powerpc/kernel/cputable.c | 15 +++++++++++++++
arch/powerpc/oprofile/op_model_power4.c | 2 +-
include/asm-powerpc/reg.h | 1 +
3 files changed, 17 insertions(+), 1 deletion(-)
Signed-off-by: Paul Mackerras <paulus@samba.org>
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low_cpu_die is called from the CPU hotplug code on 32-bit powermacs,
but it is only defined if CONFIG_PM || CONFIG_CPU_FREQ_PMAC. This
changes the ifdef so it is defined for CONFIG_HOTPLUG_CPU on 32-bit
machines.
Signed-off-by: Srinivasa DS <srinivasa@in.ibm.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>
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This fixes the warning message from the return value of function
get_property(), by making sure that the variable that receives the
value is marked as const.
Signed-off-by: Roy Zang <tie-fei.zang@freescale.com>
--
Signed-off-by: Paul Mackerras <paulus@samba.org>
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In calculating stolen time, we were trying to actually account for time
spent in the hypervisor. We don't really have enough information to do
that accurately, so don't try. Instead, we now calculate stolen time as
time that the current cpu thread is not actually dispatching instructions.
On chips without a PURR, we cannot do this, so stolen time will always
be zero. On chips with a PURR, this is merely the difference between
the elapsed PURR values and the elapsed TB values.
This gives us much more sane vaules from tools such as mpstat, even if
they are still a bit strange e.g. 2 busy threads on one cpu will both
appear to have 50% user time and 50% stolen time while 1 busy thread on
a cpu will look like 100% user on one of them and 100% idle on the other.
Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Paul Mackerras <paulus@samba.org>
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* 'for-linus' of git://one.firstfloor.org/home/andi/git/linux-2.6:
[PATCH] x86-64: increase PHB1 split transaction timeout
[PATCH] x86-64: Fix C3 timer test
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This patch increases the timeout for PCI split transactions on PHB1 on
the first Calgary to work around an issue with the aic94xx
adapter. Fixes kernel.org bugzilla #7180
(http://bugzilla.kernel.org/show_bug.cgi?id=7180)
Based on excellent debugging and a patch by Darrick J. Wong
<djwong@us.ibm.com>
Signed-off-by: Muli Ben-Yehuda <muli@il.ibm.com>
Signed-off-by: Jon Mason <jdmason@kudzu.us>
Signed-off-by: Andi Kleen <ak@suse.de>
Acked-by: Darrick J. Wong <djwong@us.ibm.com>
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There was a typo in the C3 latency test to decide of the TSC
should be used or not. It used the C2 latency threshold, not the
C3 one. Fix that.
This should fix the time on various dual core laptops.
Signed-off-by: Andi Kleen <ak@suse.de>
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The current implementation uses a sequence of a cacheflush and a copy.
This is racy in case of a multithreaded debuggee and renders GDB
virtually unusable.
Aside this fixes a performance hog rendering access to /proc/cmdline very
slow and resulting in a enough cache stalls for the 34K AP/SP programming
model to make the bare metal code on the non-Linux VPE miss RT deadlines.
The main part of this patch was originally written by Ralf Baechle;
Atushi Nemoto did the the debugging.
Signed-off-by: Atsushi Nemoto <anemo@mba.ocn.ne.jp>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
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Noticed by Samium Gromoff but his patch got stale in flight ...
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
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* 'for-linus' of git://one.firstfloor.org/home/andi/git/linux-2.6:
[PATCH] x86-64: Revert timer routing behaviour back to 2.6.16 state
[PATCH] x86-64: Overlapping program headers in physical addr space fix
[PATCH] x86-64: Put more than one cpu in TARGET_CPUS
[PATCH] x86: Revert new unwind kernel stack termination
[PATCH] x86-64: Use irq_domain in ioapic_retrigger_irq
[PATCH] i386: Disable nmi watchdog on all ThinkPads
[PATCH] x86-64: Revert interrupt backlink changes
[PATCH] x86-64: Fix ENOSYS in system call tracing
[PATCH] i386: Fix fake return address
[PATCH] x86-64: x86_64 add NX mask for PTE entry
[PATCH] x86-64: Speed up dwarf2 unwinder
[PATCH] x86: Use -maccumulate-outgoing-args
[PATCH] x86-64: fix page align in e820 allocator
[PATCH] x86-64: Fix for arch/x86_64/pci/Makefile CFLAGS
[PATCH] i386: fix .cfi_signal_frame copy-n-paste error
[PATCH] x86-64: typo in __assign_irq_vector when updating pos for vector and offset
[PATCH] x86-64: x86_64 hot-add memory srat.c fix
[PATCH] i386: Update defconfig
[PATCH] x86-64: Update defconfig
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Reintroduce NODES_SPAN_OTHER_NODES for powerpc
Revert "[PATCH] Remove SPAN_OTHER_NODES config definition"
This reverts commit f62859bb6871c5e4a8e591c60befc8caaf54db8c.
Revert "[PATCH] mm: remove arch independent NODES_SPAN_OTHER_NODES"
This reverts commit a94b3ab7eab4edcc9b2cb474b188f774c331adf7.
Also update the comments to indicate that this is still required
and where its used.
Signed-off-by: Andy Whitcroft <apw@shadowen.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Mike Kravetz <kravetz@us.ibm.com>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Acked-by: Mel Gorman <mel@csn.ul.ie>
Acked-by: Will Schmidt <will_schmidt@vnet.ibm.com>
Cc: Christoph Lameter <clameter@sgi.com>
Cc: <stable@kernel.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
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By default route the 8254 over the 8259 and only disable
it on ATI boards where this causes double timer interrupts.
This should unbreak some Nvidia boards where the timer doesn't
seem to tick of it isn't enabled in the 8259. At least one
VIA board also seemed to have a little trouble with the disabled
8259.
For 2.6.20 we'll try both dynamically without black listing, but I think
for .19 this is the safer approach because it has been already well tested
in earlier kernels. This also makes the x86-64 behaviour the same
as i386.
Command line options can change all this of course.
Signed-off-by: Andi Kleen <ak@suse.de>
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o A recent change to vmlinux.ld.S file broke kexec as now resulting vmlinux
program headers are overlapping in physical address space.
o Now all the vsyscall related sections are placed after data and after
that mostly init data sections are placed. To avoid physical overlap
among phdrs, there are three possible solutions.
- Place vsyscall sections also in data phdrs instead of user
- move vsyscal sections after init data in bss.
- create another phdrs say data.init and move all the sections
after vsyscall into this new phdr.
o This patch implements the third solution.
Signed-off-by: Vivek Goyal <vgoyal@in.ibm.com>
Signed-off-by: Andi Kleen <ak@suse.de>
Cc: Magnus Damm <magnus@valinux.co.jp>
Cc: Andi Kleen <ak@suse.de>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
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TARGET_CPUS is the default irq routing poicy. It specifies which cpus the
kernel should aim an irq at. In physflat delivery mode we can route an irq to
a single cpu. But that doesn't mean our default policy should only be a
single cpu is allowed.
By allowing the irq routing code to select from multiple cpus this enables
systems with more irqs then we can service on a single processor to actually
work.
I just audited and tested the code and irqbalance doesn't care, and the
io_apic.c doesn't care if we have extra cpus in the mask. Everything will use
or assume we are using the lowest numbered cpu in the mask if we can't use
them all.
So this should result in no behavior changes except on systems that need it.
Thanks for YH Lu for spotting this problem in his testing.
Cc: Yinghai Lu <yinghai.lu@amd.com>
Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Andi Kleen <ak@suse.de>
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