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2009-06-11MN10300: Add utrace/tracehooks supportDavid Howells
Add utrace/tracehooks support to MN10300. Signed-off-by: David Howells <dhowells@redhat.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2009-06-11MN10300: Don't set the dirty bit in the DTLB entries in the TLB-miss handlerDavid Howells
Remove the special handling for the Data TLB entry dirty bit in the TLB-miss handler. As the code stands, all that it does is to cause us to take a second data address exception to set the dirty bit. Instead, we can just let pte_mkdirty() set the bit. Signed-off-by: David Howells <dhowells@redhat.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2009-04-26mn10300: convert to use __HEAD and HEAD_TEXT macros.Tim Abbott
This has the consequence of changing the section name use for head code from ".text.head" to ".head.text". Since this commit changes all users in the architecture, this change should be harmless. Signed-off-by: Tim Abbott <tabbott@mit.edu> Cc: David Howells <dhowells@redhat.com> Acked-by: Sam Ravnborg <sam@ravnborg.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2009-04-24MN10300: Update the ASB2303 defconfigDavid Howells
Update the defconfig for the ASB2303 evaluation board. Signed-off-by: David Howells <dhowells@redhat.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2009-04-15MN10300: Stop gcc from generating uninitialised variable warnings after BUG()David Howells
Stop gcc from generating uninitialised variable warnings after BUG(). The problem is that MN10300's implementation of BUG() invokes system call 15 which doesn't return - but there's no way to tell the compiler that and also emit the bug table element with the correct file and line data. So instead, we make the do...while wrapper in _debug_bug_trap() an endless loop from which there's no escape. Also, while we're at it, (1) get rid of _debug_bug_trap() and just implement directly as BUG(), and (2) make the implementation of BUG() contingent on CONFIG_BUG=y. Signed-off-by: David Howells <dhowells@redhat.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2009-04-15MN10300: Wire up missing system callsDavid Howells
Wire up missing system calls preadv() and pwritev(). Signed-off-by: David Howells <dhowells@redhat.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2009-04-15MN10300: Discard duplicate PFN_xxx() macrosDavid Howells
Discard duplicate PFN_xxx() macros from arch code as they're now in the general headers. Signed-off-by: David Howells <dhowells@redhat.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2009-04-10Separate out the proc- and unit-specific header directories from the generalDavid Howells
MN10300 arch headers and place them instead in the same directories as contain the .c files for the processor and unit implementations. This permits the symlinks include/asm/proc and include/asm/unit to be dispensed with. This does, however, require that #include <asm/proc/xxx.h> be converted to #include <proc/xxx.h> and similarly for asm/unit -> unit. Signed-off-by: David Howells <dhowells@redhat.com>
2009-04-10Move arch headers from include/asm-mn10300/ to arch/mn10300/include/asm/.David Howells
Signed-off-by: David Howells <dhowells@redhat.com>
2009-04-09MN10300: Kill MN10300's own profiling KconfigDavid Howells
Kill MN10300's own profiling Kconfig as this is superfluous given that the profiling options have moved to init/Kconfig and arch/Kconfig. Not only is this now superfluous, but the dependencies are not correct. Signed-off-by: David Howells <dhowells@redhat.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2009-04-09MN10300: Convert obsolete no_irq_type to no_irq_chipThomas Gleixner
Convert the last remaining users to no_irq_chip. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: David Howells <dhowells@redhat.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2009-04-02Simplify copy_thread()Alexey Dobriyan
First argument unused since 2.3.11. [akpm@linux-foundation.org: coding-style fixes] Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com> Cc: <linux-arch@vger.kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2009-03-30cpumask: remove references to struct irqaction's mask field.Rusty Russell
Impact: cleanup It's unused, since about 1995. So remove all initialization of it in preparation for actually removing the field. Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> Acked-by: Thomas Gleixner <tglx@linutronix.de>
2009-03-27Merge branch 'core/percpu' into percpu-cpumask-x86-for-linus-2Ingo Molnar
Conflicts: arch/parisc/kernel/irq.c arch/x86/include/asm/fixmap_64.h arch/x86/include/asm/setup.h kernel/irq/handle.c Semantic merge: arch/x86/include/asm/fixmap.h Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-03-16Merge branches 'irq/genirq' and 'linus' into irq/coreIngo Molnar
2009-02-22Merge branch 'linus' into x86/apicIngo Molnar
Conflicts: arch/x86/mach-default/setup.c Semantic conflict resolution: arch/x86/kernel/setup.c Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-02-20mn10300: fix typo && -> || in arch/mn10300/unit-asb2305/pci.cWei Yongjun
Fix the typo && -> ||. Signed-off-by: Wei Yongjun <yjwei@cn.fujitsu.com> Signed-off-by: David Howells <dhowells@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2009-02-20mn10300: fix oprofileDavid Howells
oprofile for MN10300 seems to have been broken by the advent of the new tracing framework. Signed-off-by: David Howells <dhowells@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2009-02-13Merge branches 'irq/genirq', 'irq/sparseirq' and 'irq/urgent' into irq/coreIngo Molnar
2009-01-21Merge branch 'x86/mm' into core/percpuIngo Molnar
Conflicts: arch/x86/mm/fault.c
2009-01-15irq: update all arches for new irq_desc, fixMike Travis
Impact: fix build errors Since the SPARSE IRQS changes redefined how the kstat irqs are organized, arch's must use the new accessor function: kstat_incr_irqs_this_cpu(irq, DESC); If CONFIG_SPARSE_IRQS is set, then DESC is a pointer to the irq_desc which has a pointer to the kstat_irqs. If not, then the .irqs field of struct kernel_stat is used instead. Signed-off-by: Mike Travis <travis@sgi.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-01-14[CVE-2009-0029] Rename old_readdir to sys_old_readdirHeiko Carstens
This way it matches the generic system call name convention. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
2009-01-11sparseirq: use kstat_irqs_cpu insteadYinghai Lu
Impact: build fix Ingo Molnar wrote: > tip/arch/blackfin/kernel/irqchip.c: In function 'show_interrupts': > tip/arch/blackfin/kernel/irqchip.c:85: error: 'struct kernel_stat' has no member named 'irqs' > make[2]: *** [arch/blackfin/kernel/irqchip.o] Error 1 > make[2]: *** Waiting for unfinished jobs.... > So could move kstat_irqs array to irq_desc struct. (s390, m68k, sparc) are not touched yet, because they don't support genirq Signed-off-by: Yinghai Lu <yinghai@kernel.org> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2008-12-31take init_fs to saner placeAl Viro
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2008-12-10MN10300: Give correct size when reserving interrupt vector tableAkira Takeuchi
Give the correct size when reserving the interrupt vector table. It should be a page not a single byte. Signed-off-by: Akira Takeuchi <takeuchi.akr@jp.panasonic.com> Signed-off-by: David Howells <dhowells@redhat.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-12-10MN10300: Fix the preemption resume_kernel() routineAkira Takeuchi
Fix the preemption resume_kernel() routine by inverting the test to see whether interrupts are off (IM7 is all enabled, not all disabled). Furthermore, interrupts should be disabled on entry to resume_kernel() so that they're correctly set for jumping to restore_all() and doing the need reschedule test. Signed-off-by: Akira Takeuchi <takeuchi.akr@jp.panasonic.com> Signed-off-by: David Howells <dhowells@redhat.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-12-10MN10300: Discard low-priority Tx interrupts when closing an on-chip serial portAkira Takeuchi
Discard low-prioriy Tx interrupts when closing an MN10300 on-chip serial port. The MN10300 on-chip serial port uses three interrupts to manage its serial ports: (1) A very high priority interrupt that drives virtual DMA for Rx. (2) A very high priority interrupt that drives virtual DMA for Tx. (3) A normal priority virtual interrupt that does the normal UART interrupt stuff and is shared between Rx and Tx. mn10300_serial_stop_tx() only disables the high priority Tx interrupt. It doesn't also disable the normal priority one because it is shared with Rx. However, the high priority interrupt may interrupt local_irq_disabled() sections, and so may have queued up a low priority virtual interrupt whilst the UART driver is asking for the Tx interrupt to be disabled. The result of this can be an oops when we try to process the interrupt in mn10300_serial_transmit_interrupt() as port->uart.info and port->uart.info->tty may have gone away. To deal with this, if either of those pointers is NULL, we make sure the high-priority Tx interrupt is disabled and discard the interrupt. The low priority interrupt is disabled by the mn10300_serial_pic irq_chip table. Signed-off-by: Akira Takeuchi <takeuchi.akr@jp.panasonic.com> Signed-off-by: David Howells <dhowells@redhat.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-12-10MN10300: vmlinux.lds.S cleanup - use PAGE_SIZE, PERCPU macrosCyrill Gorcunov
Include the linux/page.h header into the MN10300 kernel linker script thus allowing us to use PAGE_SIZE macro instead of a numeric constant. Also use the PERCPU macro instead of an explicit section definition. Signed-off-by: Cyrill Gorcunov <gorcunov@gmail.com> Signed-off-by: David Howells <dhowells@redhat.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-12-03MN10300: Introduce barriers to replace removed volatiles in gdbstub 16550 driverDavid Howells
Introduce into the MN10300 gdbstub 16550 driver a couple of barrier() calls to replace the removed volatility of the input/output index variables for the Rx ring buffer. A previous patch added them into the on-chip serial port driver. Signed-off-by: David Howells <dhowells@redhat.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-12-02MN10300: Fix application of kernel module relocationsMark Salter
This fixes the MN10300 kernel module linking to match the toolchain. RELA relocs don't use the value at the location being relocated. This has been working because the tools always leave the value at the target location cleared. Signed-off-by: Mark Salter <msalter@redhat.com> Signed-off-by: David Howells <dhowells@redhat.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-11-30MN10300: Tighten up the code using case rangesRobert P. J. Day
Compress a set of consecutive switch cases into a case-range. Signed-off-by: Robert P. J. Day <rpjday@crashcourse.ca> Signed-off-by: David Howells <dhowells@redhat.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-11-12MN10300: Don't do misalignment handling for userspaceDavid Howells
Don't do misalignment handling for userspace misalignment faults: just generate an appropriate SIGBUS instead. Signed-off-by: David Howells <dhowells@redhat.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-11-12MN10300: Don't handle misaligned loading and storing of SPDavid Howells
Don't handle the misaligned loading and storing of the SP register as in C code that's most certainly a compiler bug. Signed-off-by: David Howells <dhowells@redhat.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-11-12MN10300: Handle misaligned SP-based operandsDavid Howells
Support misalignment handling for instructions that have kernel SP-based address operands, including fixing those that include IMM8 or IMM16 displacements. Signed-off-by: David Howells <dhowells@redhat.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-11-12MN10300: Fix misaligned index-register addressing handlingDavid Howells
Fix misalignment handling for an address calculated from the sum of two registers. Signed-off-by: David Howells <dhowells@redhat.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-11-12MN10300: Handle misaligned postinc-with-imm addressing mode correctlyDavid Howells
Correctly handle misalignment in MOV instructions with postinc-with-immediate addressing mode operands. In these, the immediate value is the increment to be applied the address register, not the displacement to the address. Signed-off-by: David Howells <dhowells@redhat.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-11-12MN10300: Perform misalignment fixups of MOV_LccDavid Howells
Perform misalignment fixups of the MOV_Lcc instructions (move postinc memory to register and conditionally loop). Signed-off-by: David Howells <dhowells@redhat.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-11-12MN10300: Allow misalignment fixup in interrupt handlingDavid Howells
Allow misalignment fixup in interrupt handling in the MN10300 arch. Signed-off-by: David Howells <dhowells@redhat.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-11-12MN10300: Fix register-postinc addressing misalignment handlingDavid Howells
Fix misalignment handling of operands with register postincrement addressing. The flag to indicate that postincrement is required should not be interpreted as an specification of a value to be added to the address. Also add BUGs to catch unimplemented parameter markings in the opcodes table. Signed-off-by: David Howells <dhowells@redhat.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-11-12MN10300: Extract the displacement from an insn correctly in misalignment fixupDavid Howells
Extract the displacement from an MN10300 instruction correctly in the misalignment fixup handler. The code should extract the displacement in LSB order, not MSB order. Signed-off-by: David Howells <dhowells@redhat.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-11-12MN10300: Add further misalignment fixupsDavid Howells
Add further misalignment fixup support to the MN10300 arch, notably for ABS32 and SP+disp addressing. Signed-off-by: David Howells <dhowells@redhat.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-11-12MN10300: Add built-in testing for misalignment handlerDavid Howells
Add configurable built-in testing for the MN10300 misalignment handler. Signed-off-by: David Howells <dhowells@redhat.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-11-12MN10300: Clean up the misalignment handler a littleDavid Howells
Clean up the MN10300 misalignment handler a little by: (1) Use ilog2() rather than doing implementing log2() locally. (2) Make format_tbl[] const and static. (3) Making the debugging prints more consistent. Signed-off-by: David Howells <dhowells@redhat.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-10-20mn10300: use bcd2bin/bin2bcdAdrian Bunk
Change mn10300 to use the new bcd2bin/bin2bcd functions instead of the obsolete BCD_TO_BIN/BIN_TO_BCD macros. Signed-off-by: Adrian Bunk <bunk@kernel.org> Acked-by: David Howells <dhowells@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-10-20container freezer: implement freezer cgroup subsystemMatt Helsley
This patch implements a new freezer subsystem in the control groups framework. It provides a way to stop and resume execution of all tasks in a cgroup by writing in the cgroup filesystem. The freezer subsystem in the container filesystem defines a file named freezer.state. Writing "FROZEN" to the state file will freeze all tasks in the cgroup. Subsequently writing "RUNNING" will unfreeze the tasks in the cgroup. Reading will return the current state. * Examples of usage : # mkdir /containers/freezer # mount -t cgroup -ofreezer freezer /containers # mkdir /containers/0 # echo $some_pid > /containers/0/tasks to get status of the freezer subsystem : # cat /containers/0/freezer.state RUNNING to freeze all tasks in the container : # echo FROZEN > /containers/0/freezer.state # cat /containers/0/freezer.state FREEZING # cat /containers/0/freezer.state FROZEN to unfreeze all tasks in the container : # echo RUNNING > /containers/0/freezer.state # cat /containers/0/freezer.state RUNNING This is the basic mechanism which should do the right thing for user space task in a simple scenario. It's important to note that freezing can be incomplete. In that case we return EBUSY. This means that some tasks in the cgroup are busy doing something that prevents us from completely freezing the cgroup at this time. After EBUSY, the cgroup will remain partially frozen -- reflected by freezer.state reporting "FREEZING" when read. The state will remain "FREEZING" until one of these things happens: 1) Userspace cancels the freezing operation by writing "RUNNING" to the freezer.state file 2) Userspace retries the freezing operation by writing "FROZEN" to the freezer.state file (writing "FREEZING" is not legal and returns EIO) 3) The tasks that blocked the cgroup from entering the "FROZEN" state disappear from the cgroup's set of tasks. [akpm@linux-foundation.org: coding-style fixes] [akpm@linux-foundation.org: export thaw_process] Signed-off-by: Cedric Le Goater <clg@fr.ibm.com> Signed-off-by: Matt Helsley <matthltc@us.ibm.com> Acked-by: Serge E. Hallyn <serue@us.ibm.com> Tested-by: Matt Helsley <matthltc@us.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-10-13Merge branch 'master' of ↵David Woodhouse
git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6 Conflicts: include/asm-x86/statfs.h
2008-10-01MN10300: Fix IRQ handlingDavid Howells
Fix the IRQ handling on the MN10300 arch. This patch makes a number of significant changes: (1) It separates the irq_chip definition for edge-triggered interrupts from the one for level-triggered interrupts. This is necessary because the MN10300 PIC latches the IRQ channel's interrupt request bit (GxICR_REQUEST), even after the device has ceased to assert its interrupt line and the interrupt channel has been disabled in the PIC. So for level-triggered interrupts we need to clear this bit when we re-enable - which is achieved by setting GxICR_DETECT but not GxICR_REQUEST when writing to the register. Not doing this results in spurious interrupts occurring because calling mask_ack() at the start of handle_level_irq() is insufficient - it fails to clear the REQUEST latch because the device that caused the interrupt is still asserting its interrupt line at this point. (2) IRQ disablement [irq_chip::disable_irq()] shouldn't clear the interrupt request flag for edge-triggered interrupts lest it lose an interrupt. (3) IRQ unmasking [irq_chip::unmask_irq()] also shouldn't clear the interrupt request flag for edge-triggered interrupts lest it lose an interrupt. (4) The end() operation is now left to the default (no-operation) as __do_IRQ() is compiled out. This may affect misrouted_irq(), but according to Thomas Gleixner it's the correct thing to do. (5) handle_level_irq() is used for edge-triggered interrupts rather than handle_edge_irq() as the MN10300 PIC latches interrupt events even on masked IRQ channels, thus rendering IRQ_PENDING unnecessary. It is sufficient to call mask_ack() at the start and unmask() at the end. (6) For level-triggered interrupts, ack() is now NULL as it's not used, and there is no effective ACK function on the PIC. mask_ack() is now the same as mask() as the latch continues to latch, even when the channel is masked. Further, the patch discards the disable() op implementation as its now the same as the mask() op implementation, which is used instead. It also discards the enable() op implementations as they're now the same as the unmask() op implementations, which are used instead. Signed-off-by: David Howells <dhowells@redhat.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-09-24MN10300: Make sched_clock() report time since bootDavid Howells
Make sched_clock() report time since boot rather than time since last timer interrupt. Make sched_clock() expand and scale the 32-bit TSC value running at IOCLK speed (~33MHz) to a 64-bit nanosecond counter, using cnt32_to_63() acquired from the ARM arch and without using slow DIVU instructions every call. Signed-off-by: David Howells <dhowells@redhat.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-09-11MN10300: Change the fault handler to check in_atomic() not in_interrupt()David Howells
Change the MN10300 fault handler to make it check in_atomic() rather than in_interrupt() as commit 6edaf68a87d17570790fd55f0c451a29ec1d6703 did for other architectures: Author: Peter Zijlstra <a.p.zijlstra@chello.nl> Date: Wed Dec 6 20:32:18 2006 -0800 [PATCH] mm: arch do_page_fault() vs in_atomic() In light of the recent pagefault and filemap_copy_from_user work I've gone through all the arch pagefault handlers to make sure the inc_preempt_count() 'feature' works as expected. Several sections of code (including the new filemap_copy_from_user) rely on the fact that faults do not take locks under increased preempt count. Signed-off-by: David Howells <dhowells@redhat.com> Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-09-06Remove redundant CONFIG_ARCH_SUPPORTS_AOUTDavid Woodhouse
We don't need this any more; arguably we never really did. Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
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