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2006-01-05[ARM] 3229/1: Remove uneeded ARM apm dependency on PM_LEGACYRichard Purdie
Patch from Richard Purdie ARM doesn't use ACPI so ARM's apm implementation has no need to depend on PM_LEGACY. This patch removes that dependency. Signed-off-by: Richard Purdie <rpurdie@rpsys.net> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2006-01-04[ARM] Move DMA exports to be next to each functionRussell King
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2006-01-04[ARM] Remove definition of MAX_DMA_CHANNELS to zeroRussell King
Since we now only build arch/arm/kernel/dma.c on machine types which set ISA_DMA_API, we don't need to define MAX_DMA_CHANNELS to 0 to indicate this - this definition becomes superfluous. Remove it. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2006-01-04[ARM] Refine selection of ISA_DMA_API and generic dma.c codeRussell King
ISA_DMA_API tells the rest of the kernel if the ISA DMA API is available. Select this symbol only on machine types which make use of the ISA DMA API. Make building of arch/arm/kernel/dma.c depend on this symbol - if a machine does not support the ISA DMA API, it's pointless building this file. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2006-01-04[ARM] Use core_initcall() to initialise ARM DMARussell King
There's no need to have DMA initialised at the same time as interrupts. Move it to a core_initcall(). Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2006-01-04[ARM] Remove '__address' from scatterlist and convert to DMA APIRussell King
The old __address element in struct scatterlist remained from older kernels because the ARM DMA emulation code made use of it. Move this field into struct dma_struct, and convert DMA emulation code to setup a SG entry as required. Also, convert DMA emulation code to use the new DMA API rather than the PCI DMA API. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2006-01-04[ARM] Move ISA DMA bus_to_virt() out of set_dma_addr()Russell King
Allow the compiler to optimise the bus_to_virt(virt_to_bus()) transformation in the ARM ISA DMA interface. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2006-01-03[ARM] Cleanup ARM includesRussell King
arch/arm/kernel/entry-armv.S has contained a comment suggesting that asm/hardware.h and asm/arch/irqs.h should be moved into the asm/arch/entry-macro.S include. So move the includes to these two files as required. Add missing includes (asm/hardware.h, asm/io.h) to asm/arch/system.h includes which use those facilities, and remove asm/io.h from kernel/process.c. Remove other unnecessary includes from arch/arm/kernel, arch/arm/mm and arch/arm/mach-footbridge. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2006-01-03[ARM] Make kernel link address depend on PAGE_OFFSETRussell King
We are coding the kernel link address into the makefiles, which is invisibly dependent on PAGE_OFFSET. If PAGE_OFFSET is changed, the makefiles also need to be changed. Make adjustments such that the makefiles encode just the offset from PAGE_OFFSET for the kernel link address, and use PAGE_OFFSET in the linker scripts directly. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2005-12-19[ARM] 3210/1: add missing memory barrier helper for NPTL supportNicolas Pitre
Patch from Nicolas Pitre Strictly speaking, the NPTL kernel helpers are required for pre ARMv6 only. They are available on ARMv6+ as well for obvious compatibility reasons. However there are cases where extra memory barriers are needed when using an SMP ARMv6 machine but not on pre-ARMv6. This patch adds a memory barrier kernel helper that glibc can use as needed for pre-ARMv6 binaries to be forward compatible with an SMP kernel on ARMv6, as well as the necessary dmb instructions to the cmpxchg helper. Signed-off-by: Nicolas Pitre <nico@cam.org> Acked-by: Daniel Jacobowitz <dan@codesourcery.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2005-12-17[ARM] Fix sys_sendto and sys_recvfrom 6-arg syscallsRussell King
Rather than providing more wrappers for 6-arg syscalls, arrange for them to be supported as standard. This just means that we always store the 6th argument on the stack, rather than in the wrappers. This means we eliminate the wrappers for: * sys_futex * sys_arm_fadvise64_64 * sys_mbind * sys_ipc Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2005-12-14[ARM] 3205/1: Handle new EABI relocations when loading kernel modules.Daniel Jacobowitz
Patch from Daniel Jacobowitz Handle new EABI relocations when loading kernel modules. This is necessary for CONFIG_AEABI kernels, and also for some broken (since fixed) old ABI toolchains. Signed-off-by: Daniel Jacobowitz <dan@codesourcery.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2005-12-10[ARM] 3200/1: Singlestep over ARM BX and BLX instructions using ptrace fixNikola Valerjev
Patch from Nikola Valerjev Single stepping an application using ptrace() fails over ARM instructions BX and BLX. Steps to reproduce: Compile and link the following files main.c ----- void foo(); int main() { foo(); return 0; } foo.s ----- .text .globl foo foo: BX LR Using ptrace() functionality, run to main(), and start singlestepping. Singlestep over \"BX LR\" instruction won\'t transfer the control back to main, but run the code to completion. This problems seems to be in the function get_branch_address() in arch/arm/kernel/ptrace.c. The function doesn\'t seem to recognize BX and BLX instructions as branches. BX and BLX instructions can be used to convert from ARM to Thumb mode if the target address has the low bit set. However, they are also perfectly legal in the ARM only mode. Although other things in the kernel seem to indicate that only ARM mode is accepted (and not Thumb), many compilers will generate BX and BLX instructions even when generating ARM only code. Signed-off-by: Nikola Valerjev <nikola@ghs.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2005-11-25[ARM] Remove mach-types.h from head.SRussell King
We don't really need to check whether the machine type is Netwinder or CATS before setting up the PCI IO mapping for debugging. This allows us to eliminate asm/mach-types.h from head.S Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2005-11-19[ARM] 3168/1: Update ARM signal delivery and maskingDaniel Jacobowitz
Patch from Daniel Jacobowitz After delivering a signal (creating its stack frame) we must check for additional pending unblocked signals before returning to userspace. Otherwise signals may be delayed past the next syscall or reschedule. Once that was fixed it became obvious that the ARM signal mask manipulation was broken. It was a little bit broken before the recent SA_NODEFER changes, and then very broken after them. We must block the requested signals before starting the handler or the same signal can be delivered again before the handler even gets a chance to run. Signed-off-by: Daniel Jacobowitz <dan@codesourcery.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2005-11-18[ARM] Fix get_user when passed a const pointerRussell King
Unfortunately, later gcc versions error out when our get_user is passed a const pointer, since we write to a temporary variable declared as typeof(*(p)) which propagates the const-ness. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2005-11-17[ARM] Improve comment about ASSERT()s in vmlinux.lds.SRussell King
Provide folk with an idea what to do if the ASSERT statements fail with their linker. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2005-11-13Merge master.kernel.org:/home/rmk/linux-2.6-armLinus Torvalds
2005-11-13[PATCH] move pm_register/etc. to CONFIG_PM_LEGACY, pm_legacy.hJeff Garzik
Since few people need the support anymore, this moves the legacy pm_xxx functions to CONFIG_PM_LEGACY, and include/linux/pm_legacy.h. Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-11-12[ARM] Restore apparant pointless change in arch/arm/kernel/smp.cRussell King
Restore smp.c back to how it used to be. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2005-11-09Merge master.kernel.org:/home/rmk/linux-2.6-armLinus Torvalds
2005-11-09[PATCH] sched: resched and cpu_idle reworkNick Piggin
Make some changes to the NEED_RESCHED and POLLING_NRFLAG to reduce confusion, and make their semantics rigid. Improves efficiency of resched_task and some cpu_idle routines. * In resched_task: - TIF_NEED_RESCHED is only cleared with the task's runqueue lock held, and as we hold it during resched_task, then there is no need for an atomic test and set there. The only other time this should be set is when the task's quantum expires, in the timer interrupt - this is protected against because the rq lock is irq-safe. - If TIF_NEED_RESCHED is set, then we don't need to do anything. It won't get unset until the task get's schedule()d off. - If we are running on the same CPU as the task we resched, then set TIF_NEED_RESCHED and no further action is required. - If we are running on another CPU, and TIF_POLLING_NRFLAG is *not* set after TIF_NEED_RESCHED has been set, then we need to send an IPI. Using these rules, we are able to remove the test and set operation in resched_task, and make clear the previously vague semantics of POLLING_NRFLAG. * In idle routines: - Enter cpu_idle with preempt disabled. When the need_resched() condition becomes true, explicitly call schedule(). This makes things a bit clearer (IMO), but haven't updated all architectures yet. - Many do a test and clear of TIF_NEED_RESCHED for some reason. According to the resched_task rules, this isn't needed (and actually breaks the assumption that TIF_NEED_RESCHED is only cleared with the runqueue lock held). So remove that. Generally one less locked memory op when switching to the idle thread. - Many idle routines clear TIF_POLLING_NRFLAG, and only set it in the inner most polling idle loops. The above resched_task semantics allow it to be set until before the last time need_resched() is checked before going into a halt requiring interrupt wakeup. Many idle routines simply never enter such a halt, and so POLLING_NRFLAG can be always left set, completely eliminating resched IPIs when rescheduling the idle task. POLLING_NRFLAG width can be increased, to reduce the chance of resched IPIs. Signed-off-by: Nick Piggin <npiggin@suse.de> Cc: Ingo Molnar <mingo@elte.hu> Cc: Con Kolivas <kernel@kolivas.org> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-11-09[PATCH] sched: disable preempt in idle tasksNick Piggin
Run idle threads with preempt disabled. Also corrected a bugs in arm26's cpu_idle (make it actually call schedule()). How did it ever work before? Might fix the CPU hotplugging hang which Nigel Cunningham noted. We think the bug hits if the idle thread is preempted after checking need_resched() and before going to sleep, then the CPU offlined. After calling stop_machine_run, the CPU eventually returns from preemption and into the idle thread and goes to sleep. The CPU will continue executing previous idle and have no chance to call play_dead. By disabling preemption until we are ready to explicitly schedule, this bug is fixed and the idle threads generally become more robust. From: alexs <ashepard@u.washington.edu> PPC build fix From: Yoichi Yuasa <yuasa@hh.iij4u.or.jp> MIPS build fix Signed-off-by: Nick Piggin <npiggin@suse.de> Signed-off-by: Yoichi Yuasa <yuasa@hh.iij4u.or.jp> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-11-09[ARM] 3100/1: simplify a pointer computationNicolas Pitre
Patch from Nicolas Pitre Looks clearer this way. Signed-off-by: Nicolas Pitre <nico@cam.org> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2005-11-08Merge with ARM SMP treeRussell King
2005-11-08[ARM] 3134/1: add missing EXPORT_SYMBOL for the ARM version of sha_transformNicolas Pitre
Patch from Nicolas Pitre Noticed by Woody Suwalski <woodys@xandros.com>. Signed-off-by: Nicolas Pitre <nico@cam.org> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2005-11-08[ARM SMP] Add core ARM support for local timersRussell King
Add infrastructure for supporting per-cpu local timers to update the profiling information and update system time accounting. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2005-11-08[ARM] More sparse fixesRussell King
arch/arm/kernel/irq.c:998:26: warning: Using plain integer as NULL pointer arch/arm/kernel/smp.c:145:25: warning: Using plain integer as NULL pointer arch/arm/kernel/smp.c:362:5: warning: symbol 'smp_call_function_on_cpu' was not declared. Should it be static? drivers/video/amba-clcd.c:521:12: warning: symbol 'amba_clcdfb_init' was not declared. Should it be static? Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2005-11-08[ARM SMP] Fix some sparse warnings in SMP codeRussell King
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2005-11-07[PATCH] consolidate sys_ptrace()Christoph Hellwig
The sys_ptrace boilerplate code (everything outside the big switch statement for the arch-specific requests) is shared by most architectures. This patch moves it to kernel/ptrace.c and leaves the arch-specific code as arch_ptrace. Some architectures have a too different ptrace so we have to exclude them. They continue to keep their implementations. For sh64 I had to add a sh64_ptrace wrapper because it does some initialization on the first call. For um I removed an ifdefed SUBARCH_PTRACE_SPECIAL block, but SUBARCH_PTRACE_SPECIAL isn't defined anywhere in the tree. Signed-off-by: Christoph Hellwig <hch@lst.de> Acked-by: Paul Mackerras <paulus@samba.org> Acked-by: Ralf Baechle <ralf@linux-mips.org> Acked-By: David Howells <dhowells@redhat.com> Acked-by: Russell King <rmk+kernel@arm.linux.org.uk> Acked-by: Paul Mundt <lethal@linux-sh.org> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-11-06[ARM] Fix /proc/cpuinfo format for ARM SMPRussell King
glibc expects to count lines beginning with "processor" to determine the number of processors, not lines beginning with "Processor". So, give glibc the format it expects. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2005-11-06[ARM] Don't call dump_cpu_info unless we're bootingRussell King
We don't want to call dump_cpu_info() from cpu_init() after boot since it produces a lot of unnecessary noise - since cpu_init() gets called on resume and hotplug cpu insertion events. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2005-11-06[ARM] Fix second missing declaration of cache_is_vivt()Russell King
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2005-11-06[ARM] Fix missing declaration of cache_is_vivt()Russell King
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2005-11-06[ARM] 3115/1: small optimizations to exception vector entry codeNicolas Pitre
Patch from Nicolas Pitre Since we know the value of cpsr on entry, we can replace the bic+orr with a single eor. Also remove a possible result delay (at least on XScale). Signed-off-by: Nicolas Pitre <nico@cam.org> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2005-11-02[ARM SMP] Add hotplug CPU infrastructureRussell King
This patch adds the infrastructure to support hotplug CPU on ARM platforms. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2005-11-02[ARM SMP] Fix a couple of warningsRussell King
Use *cpus_addr() to display the mask of pending/to be called CPUs. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2005-11-02[ARM SMP] Track CPU idle threadsRussell King
Track the idle thread task_struct for each CPU. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2005-10-30Merge master.kernel.org:/home/rmk/linux-2.6-armLinus Torvalds
2005-10-30[PATCH] fix missing includesTim Schmielau
I recently picked up my older work to remove unnecessary #includes of sched.h, starting from a patch by Dave Jones to not include sched.h from module.h. This reduces the number of indirect includes of sched.h by ~300. Another ~400 pointless direct includes can be removed after this disentangling (patch to follow later). However, quite a few indirect includes need to be fixed up for this. In order to feed the patches through -mm with as little disturbance as possible, I've split out the fixes I accumulated up to now (complete for i386 and x86_64, more archs to follow later) and post them before the real patch. This way this large part of the patch is kept simple with only adding #includes, and all hunks are independent of each other. So if any hunk rejects or gets in the way of other patches, just drop it. My scripts will pick it up again in the next round. Signed-off-by: Tim Schmielau <tim@physik3.uni-rostock.de> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-10-30[PATCH] jiffies_64 cleanupThomas Gleixner
Define jiffies_64 in kernel/timer.c rather than having 24 duplicated defines in each architecture. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-10-30[PATCH] unify sys_ptrace prototypeChristoph Hellwig
Make sure we always return, as all syscalls should. Also move the common prototype to <linux/syscalls.h> Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Miklos Szeredi <miklos@szeredi.hu> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-10-30[ARM] Re-organise die()Russell King
Provide __die() which can be called from various contexts to provide an oops report. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2005-10-29[PATCH] mm: arm ready for split ptlockHugh Dickins
Prepare arm for the split page_table_lock: three issues. Signal handling's preserve and restore of iwmmxt context currently involves reading and writing that context to and from user space, while holding page_table_lock to secure the user page(s) against kswapd. If we split the lock, then the structure might span two pages, secured by to read into and write from a kernel stack buffer, copying that out and in without locking (the structure is 160 bytes in size, and here we're near the top of the kernel stack). Or would the overhead be noticeable? arm_syscall's cmpxchg emulation use pte_offset_map_lock, instead of pte_offset_map and mm-wide page_table_lock; and strictly, it should now also take mmap_sem before descending to pmd, to guard against another thread munmapping, and the page table pulled out beneath this thread. Updated two comments in fault-armv.c. adjust_pte is interesting, since its modification of a pte in one part of the mm depends on the lock held when calling update_mmu_cache for a pte in some other part of that mm. This can't be done with a split page_table_lock (and we've already taken the lowest lock in the hierarchy here): so we'll have to disable split on arm, unless CONFIG_CPU_CACHE_VIPT to ensures adjust_pte never used. Signed-off-by: Hugh Dickins <hugh@veritas.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-10-29[ARM] 3061/1: cleanup the XIP link address messNicolas Pitre
Patch from Nicolas Pitre Since vmlinux.lds.S is preprocessed, we can use the defines already present in asm/memory.h (allowed by patch #3060) for the XIP kernel link address instead of relying on a duplicated Makefile hardcoded value, and also get rid of its dependency on awk to handle it at the same time. While at it let's clean XIP stuff even further and make things clearer in head.S with a nice code reduction. Signed-off-by: Nicolas Pitre <nico@cam.org> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2005-10-29[ARM] 3060/1: allow constants found in asm/memory.h to be used in asm codeNicolas Pitre
Patch from Nicolas Pitre This patch allows for assorted type of cleanups by letting assembly code use the same set of defines for constant values and avoid duplicated definitions that might not always be in sync, or that might simply be confusing due to the different names for the same thing. Signed-off-by: Nicolas Pitre <nico@cam.org> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2005-10-28[ARM] 3035/1: RISCOS compat code fixNicolas Pitre
Patch from Nicolas Pitre From: Daniel Jacobowitz <dan@debian.org> > I also fixed a bug that confused me greatly while trying to debug: one > SIGILL has long been a SIGSEGV because of some broken RISCOS > compatibility code. Signed-off-by: Nicolas Pitre <nico@cam.org> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2005-10-28[ARM] Fix sparse warningsRussell King
Fix sparse warnings in arch/arm/kernel/module.c, arch/arm/mm/consistent.c, drivers/pcmcia/sa1111_generic.c, and platform support files. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2005-10-13[ARM] 3008/1: the exception table is not read-onlyNicolas Pitre
Patch from Nicolas Pitre ... and therefore should not live in the .text section. Signed-off-by: Nicolas Pitre <nico@cam.org> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2005-10-12[ARM] 2977/1: armksyms.c - make items in export table staticBen Dooks
Patch from Ben Dooks The items in the export table do not need to be exported elsehwere, so quash the sparse warning by making the symbol for the table entry static. Signed-off-by: Ben Dooks <ben-linux@fluff.org> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>