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2011-05-24um: Use RWSEM_GENERIC_SPINLOCK on x86Richard Weinberger
Commit d12337 (rwsem: Remove redundant asmregparm annotation) broke rwsem on UML. As we cannot compile UML with -mregparm=3 and keeping asmregparm only for UML is inadequate the easiest solution is using RWSEM_GENERIC_SPINLOCK. Thanks to Thomas Gleixner for the idea. Reported-by: Toralf Förster <toralf.foerster@gmx.de> Tested-by: Toralf Förster <toralf.foerster@gmx.de> Signed-off-by: Richard Weinberger <richard@nod.at> Cc: user-mode-linux-devel@lists.sourceforge.net Cc: <stable@kernel.org> # .39.x Link: http://lkml.kernel.org/r/%3C1306183893-26655-1-git-send-email-richard%40nod.at%3E Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2011-05-24Merge branch 'fixes-2.6.39' into for-2.6.40Tejun Heo
2011-05-23Merge branch 'for-linus' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial: (39 commits) b43: fix comment typo reqest -> request Haavard Skinnemoen has left Atmel cris: typo in mach-fs Makefile Kconfig: fix copy/paste-ism for dell-wmi-aio driver doc: timers-howto: fix a typo ("unsgined") perf: Only include annotate.h once in tools/perf/util/ui/browsers/annotate.c md, raid5: Fix spelling error in comment ('Ofcourse' --> 'Of course'). treewide: fix a few typos in comments regulator: change debug statement be consistent with the style of the rest Revert "arm: mach-u300/gpio: Fix mem_region resource size miscalculations" audit: acquire creds selectively to reduce atomic op overhead rtlwifi: don't touch with treewide double semicolon removal treewide: cleanup continuations and remove logging message whitespace ath9k_hw: don't touch with treewide double semicolon removal include/linux/leds-regulator.h: fix syntax in example code tty: fix typo in descripton of tty_termios_encode_baud_rate xtensa: remove obsolete BKL kernel option from defconfig m68k: fix comment typo 'occcured' arch:Kconfig.locks Remove unused config option. treewide: remove extra semicolons ...
2011-05-19Merge branches 'sched-core-for-linus' and 'sched-urgent-for-linus' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip * 'sched-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip: (60 commits) sched: Fix and optimise calculation of the weight-inverse sched: Avoid going ahead if ->cpus_allowed is not changed sched, rt: Update rq clock when unthrottling of an otherwise idle CPU sched: Remove unused parameters from sched_fork() and wake_up_new_task() sched: Shorten the construction of the span cpu mask of sched domain sched: Wrap the 'cfs_rq->nr_spread_over' field with CONFIG_SCHED_DEBUG sched: Remove unused 'this_best_prio arg' from balance_tasks() sched: Remove noop in alloc_rt_sched_group() sched: Get rid of lock_depth sched: Remove obsolete comment from scheduler_tick() sched: Fix sched_domain iterations vs. RCU sched: Next buddy hint on sleep and preempt path sched: Make set_*_buddy() work on non-task entities sched: Remove need_migrate_task() sched: Move the second half of ttwu() to the remote cpu sched: Restructure ttwu() some more sched: Rename ttwu_post_activation() to ttwu_do_wakeup() sched: Remove rq argument from ttwu_stat() sched: Remove rq->lock from the first half of ttwu() sched: Drop rq->lock from sched_exec() ... * 'sched-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip: sched: Fix rt_rq runtime leakage bug
2011-05-18um: fix abortRichard Weinberger
os_dump_core() uses abort() to terminate UML in case of an fatal error. glibc's abort() calls raise(SIGABRT) which makes use of tgkill(). tgkill() has no effect within UML's kernel threads because they are not pthreads. As fallback abort() executes an invalid instruction to terminate the process. Therefore UML gets killed by SIGSEGV and leaves a ugly log entry in the host's kernel ring buffer. To get rid of this we use our own abort routine. Signed-off-by: Richard Weinberger <richard@nod.at> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2011-05-12Merge commit 'v2.6.39-rc7' into sched/coreIngo Molnar
2011-04-28um: adjust current_thread_info() for newer gcc versionsRichard Weinberger
In some cases gcc >= 4.5.2 will optimize away current_thread_info(). To prevent gcc from doing so the stack address has to be obtained via inline asm. Signed-off-by: Richard Weinberger <richard@nod.at> Acked-by: Kirill A. Shutemov <kirill@shutemov.name> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2011-04-28uml: fix hppfs buildRandy Dunlap
Make HoneyPot ProcFS depend on CONFIG_PROC_FS so that it will build. Recommended by Christoph Hellwig. Addresses https://bugzilla.kernel.org/show_bug.cgi?id=33692 Reported-by: Simon Danner <danner.simon@gmail.com> Signed-off-by: Randy Dunlap <randy.dunlap@oracle.com> Cc: Jeff Dike <jdike@addtoit.com> Cc: Christoph Hellwig <hch@infradead.org> Signed-off-by: Richard Weinberger <richard@nod.at> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2011-04-28um: mdd support for 64 bit atomic operationsRichard Weinberger
This adds support for 64 bit atomic operations on 32 bit UML systems. XFS needs them since 2.6.38. $ make ARCH=um SUBARCH=i386 ... LD .tmp_vmlinux1 fs/built-in.o: In function `xlog_regrant_reserve_log_space': xfs_log.c:(.text+0xd8584): undefined reference to `atomic64_read_386' xfs_log.c:(.text+0xd85ac): undefined reference to `cmpxchg8b_emu' ... Addresses https://bugzilla.kernel.org/show_bug.cgi?id=32812 Reported-by: Martin Walch <walch.martin@web.de> Tested-by: Martin Walch <walch.martin@web.de> Cc: Martin Walch <walch.martin@web.de> Cc: <stable@kernel.org> [2.6.38.x 084189a: um: disable CONFIG_CMPXCHG_LOCAL] Signed-off-by: Richard Weinberger <richard@nod.at> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2011-04-26Merge branch 'master' into for-nextJiri Kosina
Fast-forwarded to current state of Linus' tree as there are patches to be applied for files that didn't exist on the old branch.
2011-04-21Merge commit 'v2.6.39-rc4' into sched/coreIngo Molnar
Merge reason: Pick up upstream fixes. Signed-off-by: Ingo Molnar <mingo@elte.hu>
2011-04-14um: disable CONFIG_CMPXCHG_LOCALRichard Weinberger
Commit 8a5ec0ba "Lockless (and preemptless) fastpaths for slub" makes use of this_cpu_cmpxchg_double() which needs this_cpu_cmpxchg16b_emu() on x86_64. Implementing cmpxchg16b emulation for UML would introduce too much complexity. So just disable it. Signed-off-by: Richard Weinberger <richard@nod.at> Reported-by: Sergei Trofimovich <slyich@gmail.com> Acked-by: Pekka Enberg <penberg@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2011-04-14um: fix call tracer and bug handlerRichard Weinberger
Commit 1de1502c ("x86, um: now we can get rid of trivial uml headers") removed accidentally bug.h which broke UML's call tracer and bug handler. Without asm-generic/bug.h UML uses BUG() from arch/x86/ which makes use of ud2. UML cannot use ud2, it raises SIGILL in user mode. As UML has a different stack for handling signals the call trace will be cut off. Signed-off-by: Richard Weinberger <richard@nod.at> Reported-by: Sergei Trofimovich <slyich@gmail.com> Tested-by: Sergei Trofimovich <slyich@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2011-04-14sched: Provide scheduler_ipi() callback in response to smp_send_reschedule()Peter Zijlstra
For future rework of try_to_wake_up() we'd like to push part of that function onto the CPU the task is actually going to run on. In order to do so we need a generic callback from the existing scheduler IPI. This patch introduces such a generic callback: scheduler_ipi() and implements it as a NOP. BenH notes: PowerPC might use this IPI on offline CPUs under rare conditions! Acked-by: Russell King <rmk+kernel@arm.linux.org.uk> Acked-by: Martin Schwidefsky <schwidefsky@de.ibm.com> Acked-by: Chris Metcalf <cmetcalf@tilera.com> Acked-by: Jesper Nilsson <jesper.nilsson@axis.com> Acked-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Ralf Baechle <ralf@linux-mips.org> Reviewed-by: Frank Rowand <frank.rowand@am.sony.com> Cc: Mike Galbraith <efault@gmx.de> Cc: Nick Piggin <npiggin@kernel.dk> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Link: http://lkml.kernel.org/r/20110405152728.744338123@chello.nl
2011-04-10treewide: remove extra semicolonsJustin P. Mattock
Signed-off-by: Justin P. Mattock <justinmattock@gmail.com> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
2011-03-31Fix common misspellingsLucas De Marchi
Fixes generated by 'codespell' and manually reviewed. Signed-off-by: Lucas De Marchi <lucas.demarchi@profusion.mobi>
2011-03-30genirq: Remove the now obsolete config options and select statementsThomas Gleixner
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2011-03-24um: Use generic show_interrupts()Thomas Gleixner
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2011-03-24um: Convert genirq namespaceThomas Gleixner
Scripted with coccinelle. Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2011-03-24percpu: Always align percpu output section to PAGE_SIZETejun Heo
Percpu allocator honors alignment request upto PAGE_SIZE and both the percpu addresses in the percpu address space and the translated kernel addresses should be aligned accordingly. The calculation of the former depends on the alignment of percpu output section in the kernel image. The linker script macros PERCPU_VADDR() and PERCPU() are used to define this output section and the latter takes @align parameter. Several architectures are using @align smaller than PAGE_SIZE breaking percpu memory alignment. This patch removes @align parameter from PERCPU(), renames it to PERCPU_SECTION() and makes it always align to PAGE_SIZE. While at it, add PCPU_SETUP_BUG_ON() checks such that alignment problems are reliably detected and remove percpu alignment comment recently added in workqueue.c as the condition would trigger BUG way before reaching there. For um, this patch raises the alignment of percpu area. As the area is in .init, there shouldn't be any noticeable difference. This problem was discovered by David Howells while debugging boot failure on mn10300. Signed-off-by: Tejun Heo <tj@kernel.org> Acked-by: Mike Frysinger <vapier@gentoo.org> Cc: uclinux-dist-devel@blackfin.uclinux.org Cc: David Howells <dhowells@redhat.com> Cc: Jeff Dike <jdike@addtoit.com> Cc: user-mode-linux-devel@lists.sourceforge.net
2011-03-22um: remove file pointer from ioctlRichard Weinberger
Commit 6caa76b ("tty: now phase out the ioctl file pointer for good") removed the ioctl file pointer. User Mode Linux's line driver uses this ioctl and needs a signature update too. Signed-off-by: Richard Weinberger <richard@nod.at> Cc: Alan Cox <alan@lxorguk.ukuu.org.uk> Cc: Greg KH <greg@kroah.com> Cc: Jeff Dike <jdike@addtoit.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2011-03-22uml: kernels on {i386,x86_64} produce bad coredumpsPaul Pluzhnikov
One of our users reported that when a user-level program SIGSEGVs under UML kernel, the resulting core dump is not very usable. I have reproduced that with the latest kernel: make ARCH=um defconfig; make ARCH=um Run the resulting kernel, then "inside" run this program: #include <pthread.h> void *fn(void *p) { abort(); } int main() { pthread_t tid; pthread_create(&tid, 0, fn, 0); pthread_join(tid, 0); return 0; } Analyze the coredump with GDB. Here is what you'll see: sudo gdb -q -ex 'set solib-absolute-prefix ../root_fs' -ex 'file ../root_fs/var/tmp/mt-abort' -ex 'core ../root_fs/var/tmp/core.762' Reading symbols from /usr/local/google/root_fs/var/tmp/mt-abort...done. [New Thread 763] [New Thread 762] Core was generated by `./mt-abort'. Program terminated with signal 6, Aborted. #0 0x0000000040255250 in raise () from ../root_fs/lib64/libc.so.6 (gdb) info thread 2 Thread 762 0x0000000000000000 in ?? () * 1 Thread 763 0x0000000040255250 in raise () from ../root_fs/lib64/libc.so.6 Note that thread#2 looks funny. (gdb) thread 2 [Switching to thread 2 (Thread 762)]#0 0x0000000000000000 in ?? () (gdb) info reg rax 0x0 0 rbx 0x0 0 rcx 0x0 0 rdx 0x0 0 rsi 0x0 0 rdi 0x0 0 rbp 0x0 0x0 rsp 0x0 0x0 r8 0x0 0 r9 0x0 0 r10 0x0 0 r11 0x0 0 r12 0x0 0 r13 0x0 0 r14 0x0 0 r15 0x0 0 rip 0x0 0 eflags 0x0 [ ] cs 0x0 0 ss 0x0 0 ds 0x0 0 es 0x0 0 fs 0x0 0 gs 0x0 0 Examining the core shows that NT_PRSTATUS notes for all threads other than the one that crashed are zeroed out. I believe this is happening because neither ELF_CORE_COPY_TASK_REGS nor task_pt_regs are defined under ARCH=um, and so elf_core_copy_task_regs() becomes a no-op. Attached patch fixes this for SUBARCH={x86_64,i386}. Signed-off-by: Paul Pluzhnikov <ppluzhnikov@google.com> Cc: Jeff Dike <jdike@addtoit.com> Acked-by: WANG Cong <xiyou.wangcong@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2011-03-22mm: NUMA aware alloc_task_struct_node()Eric Dumazet
All kthreads being created from a single helper task, they all use memory from a single node for their kernel stack and task struct. This patch suite creates kthread_create_on_cpu(), adding a 'cpu' parameter to parameters already used by kthread_create(). This parameter serves in allocating memory for the new kthread on its memory node if available. Users of this new function are : ksoftirqd, kworker, migration, pktgend... This patch: Add a node parameter to alloc_task_struct(), and change its name to alloc_task_struct_node() This change is needed to allow NUMA aware kthread_create_on_cpu() Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com> Acked-by: David S. Miller <davem@davemloft.net> Reviewed-by: Andi Kleen <ak@linux.intel.com> Acked-by: Rusty Russell <rusty@rustcorp.com.au> Cc: Tejun Heo <tj@kernel.org> Cc: Tony Luck <tony.luck@intel.com> Cc: Fenghua Yu <fenghua.yu@intel.com> Cc: David Howells <dhowells@redhat.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>
2011-03-20Merge branch 'trivial' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/mmarek/kbuild-2.6 * 'trivial' of git://git.kernel.org/pub/scm/linux/kernel/git/mmarek/kbuild-2.6: (25 commits) video: change to new flag variable scsi: change to new flag variable rtc: change to new flag variable rapidio: change to new flag variable pps: change to new flag variable net: change to new flag variable misc: change to new flag variable message: change to new flag variable memstick: change to new flag variable isdn: change to new flag variable ieee802154: change to new flag variable ide: change to new flag variable hwmon: change to new flag variable dma: change to new flag variable char: change to new flag variable fs: change to new flag variable xtensa: change to new flag variable um: change to new flag variables s390: change to new flag variable mips: change to new flag variable ... Fix up trivial conflict in drivers/hwmon/Makefile
2011-03-17um: change to new flag variablesmatt mooney
Replace EXTRA_CFLAGS with ccflags-y and EXTRA_AFLAGS with asflags-y. Signed-off-by: matt mooney <mfm@muteddisk.com> Acked-by: WANG Cong <xiyou.wangcong@gmail.com> Signed-off-by: Michal Marek <mmarek@suse.cz>
2011-03-16Merge branch 'for-2.6.39' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/tj/percpu * 'for-2.6.39' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/percpu: percpu, x86: Add arch-specific this_cpu_cmpxchg_double() support percpu: Generic support for this_cpu_cmpxchg_double() alpha: use L1_CACHE_BYTES for cacheline size in the linker script percpu: align percpu readmostly subsection to cacheline Fix up trivial conflict in arch/x86/kernel/vmlinux.lds.S due to the percpu alignment having changed ("x86: Reduce back the alignment of the per-CPU data section")
2011-03-15Merge branch 'um-irq-for-linus' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip * 'um-irq-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip: um: Select GENERIC_HARDIRQS_NO_DEPRECATED um: Use proper accessors in show_interrupts() um: Convert irq_chips to new functions um: Remove stale irq_chip.end
2011-03-15Merge branch 'x86-asm-for-linus' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip * 'x86-asm-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip: x86, binutils, xen: Fix another wrong size directive x86: Remove dead config option X86_CPU x86: Really print supported CPUs if PROCESSOR_SELECT=y x86: Fix a bogus unwind annotation in lib/semaphore_32.S um, x86-64: Fix UML build after adding CFI annotations to lib/rwsem_64.S x86: Remove unused bits from lib/thunk_*.S x86: Use {push,pop}_cfi in more places x86-64: Add CFI annotations to lib/rwsem_64.S x86, asm: Cleanup unnecssary macros in asm-offsets.c x86, system.h: Drop unused __SAVE/__RESTORE macros x86: Use bitmap library functions x86: Partly unify asm-offsets_{32,64}.c x86: Reduce back the alignment of the per-CPU data section
2011-03-15Merge branch 'core-locking-for-linus' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip * 'core-locking-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip: rtmutex: tester: Remove the remaining BKL leftovers lockdep/timers: Explain in detail the locking problems del_timer_sync() may cause rtmutex: Simplify PI algorithm and make highest prio task get lock rwsem: Remove redundant asmregparm annotation rwsem: Move duplicate function prototypes to linux/rwsem.h rwsem: Unify the duplicate rwsem_is_locked() inlines rwsem: Move duplicate init macros and functions to linux/rwsem.h rwsem: Move duplicate struct rwsem declaration to linux/rwsem.h x86: Cleanup rwsem_count_t typedef rwsem: Cleanup includes locking: Remove deprecated lock initializers cred: Replace deprecated spinlock initialization kthread: Replace deprecated spinlock initialization xtensa: Replace deprecated spinlock initialization um: Replace deprecated spinlock initialization sparc: Replace deprecated spinlock initialization mips: Replace deprecated spinlock initialization cris: Replace deprecated spinlock initialization alpha: Replace deprecated spinlock initialization rtmutex-tester: Remove BKL tests
2011-03-14open-style analog of vfs_path_lookup()Al Viro
new function: file_open_root(dentry, mnt, name, flags) opens the file vfs_path_lookup would arrive to. Note that name can be empty; in that case the usual requirement that dentry should be a directory is lifted. open-coded equivalents switched to it, may_open() got down exactly one caller and became static. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2011-03-09x86: Remove dead config option X86_CPUJan Beulich
This isn't being referenced anywhere, and the selects done from it can be easily done together with all the other X86 ones. v2: Also adjust UML's Kconfig.x86. Signed-off-by: Jan Beulich <jbeulich@novell.com> LKML-Reference: <4D7603DA02000078000351C1@vpn.id2.novell.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2011-03-01um, x86-64: Fix UML build after adding CFI annotations to lib/rwsem_64.SJan Beulich
arch/um/Kconfig.x86 has X86_32 but not X86_64 - that's resulting in asm/dwarf2.h producing the 32-bit (pushl_cfi & Co) macros instead of the 64-bit ones. Signed-off-by: Jan Beulich <jbeulich@novell.com> Cc: Jeff Dike <jdike@addtoit.com> LKML-Reference: <4D6CE3400200007800034498@vpn.id2.novell.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2011-02-14um: Select GENERIC_HARDIRQS_NO_DEPRECATEDThomas Gleixner
irq chips converted and proper accessor functions used. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: Jeff Dike <jdike@addtoit.com> Cc: Andrew Morton <akpm@linux-foundation.org> LKML-Reference: <20110206224515.430825903@linutronix.de>
2011-02-14um: Use proper accessors in show_interrupts()Thomas Gleixner
Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: Jeff Dike <jdike@addtoit.com> Cc: Andrew Morton <akpm@linux-foundation.org> LKML-Reference: <20110206224515.322707425@linutronix.de>
2011-02-14um: Convert irq_chips to new functionsThomas Gleixner
Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: Jeff Dike <jdike@addtoit.com> Cc: Andrew Morton <akpm@linux-foundation.org> LKML-Reference: <20110206224515.224027758@linutronix.de>
2011-02-14um: Remove stale irq_chip.endThomas Gleixner
irq_chip.end got obsolete with the remnoval of __do_IRQ(). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: Jeff Dike <jdike@addtoit.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Andrew Morton <akpm@linux-foundation.org> LKML-Reference: <20110206224515.135703209@linutronix.de>
2011-01-27um: Replace deprecated spinlock initializationThomas Gleixner
SPIN_LOCK_UNLOCK is deprecated. Use the lockdep capable variant instead. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: Jeff Dike <jdike@addtoit.com>
2011-01-25percpu: align percpu readmostly subsection to cachelineTejun Heo
Currently percpu readmostly subsection may share cachelines with other percpu subsections which may result in unnecessary cacheline bounce and performance degradation. This patch adds @cacheline parameter to PERCPU() and PERCPU_VADDR() linker macros, makes each arch linker scripts specify its cacheline size and use it to align percpu subsections. This is based on Shaohua's x86 only patch. Signed-off-by: Tejun Heo <tj@kernel.org> Cc: Shaohua Li <shaohua.li@intel.com>
2011-01-21um: Use generic irq KconfigThomas Gleixner
No functional change. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Jeff Dike <jdike@addtoit.com>
2011-01-21genirq: Remove __do_IRQThomas Gleixner
All architectures are finally converted. Remove the cruft. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: Richard Henderson <rth@twiddle.net> Cc: Mike Frysinger <vapier@gentoo.org> Cc: David Howells <dhowells@redhat.com> Cc: Tony Luck <tony.luck@intel.com> Cc: Greg Ungerer <gerg@uclinux.org> Cc: Michal Simek <monstr@monstr.eu> Acked-by: David Howells <dhowells@redhat.com> Cc: Kyle McMartin <kyle@mcmartin.ca> Acked-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Chen Liqin <liqin.chen@sunplusct.com> Cc: "David S. Miller" <davem@davemloft.net> Cc: Chris Metcalf <cmetcalf@tilera.com> Cc: Jeff Dike <jdike@addtoit.com>
2011-01-20kconfig: rename CONFIG_EMBEDDED to CONFIG_EXPERTDavid Rientjes
The meaning of CONFIG_EMBEDDED has long since been obsoleted; the option is used to configure any non-standard kernel with a much larger scope than only small devices. This patch renames the option to CONFIG_EXPERT in init/Kconfig and fixes references to the option throughout the kernel. A new CONFIG_EMBEDDED option is added that automatically selects CONFIG_EXPERT when enabled and can be used in the future to isolate options that should only be considered for embedded systems (RISC architectures, SLOB, etc). Calling the option "EXPERT" more accurately represents its intention: only expert users who understand the impact of the configuration changes they are making should enable it. Reviewed-by: Ingo Molnar <mingo@elte.hu> Acked-by: David Woodhouse <david.woodhouse@intel.com> Signed-off-by: David Rientjes <rientjes@google.com> Cc: Greg KH <gregkh@suse.de> Cc: "David S. Miller" <davem@davemloft.net> Cc: Jens Axboe <axboe@kernel.dk> Cc: Arnd Bergmann <arnd@arndb.de> Cc: Robin Holt <holt@sgi.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>
2011-01-13thp: pte alloc trans splittingAndrea Arcangeli
pte alloc routines must wait for split_huge_page if the pmd is not present and not null (i.e. pmd_trans_splitting). The additional branches are optimized away at compile time by pmd_trans_splitting if the config option is off. However we must pass the vma down in order to know the anon_vma lock to wait for. [akpm@linux-foundation.org: coding-style fixes] Signed-off-by: Andrea Arcangeli <aarcange@redhat.com> Acked-by: Rik van Riel <riel@redhat.com> Acked-by: Mel Gorman <mel@csn.ul.ie> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2011-01-13uml: use simple_write_to_buffer()Akinobu Mita
Simplify write file operation for mmapper by using simple_write_to_buffer(). Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com> Cc: Jeff Dike <jdike@addtoit.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2011-01-13uml: mmapper_kern needs MODULE_LICENSERandy Dunlap
Add missing MODULE_LICENSE(): WARNING: modpost: missing MODULE_LICENSE() in arch/um/drivers/mmapper_kern.o Signed-off-by: Randy Dunlap <randy.dunlap@oracle.com> Cc: Greg Lonnon <glonnon@ridgerun.com> Cc: Jeff Dike <jdike@addtoit.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2011-01-13arch/um/drivers/line.c: safely iterate over list of winch handlersWill Newton
unregister_winch() should use list_for_each_safe(), as it can delete from the list. Signed-off-by: Will Newton <will.newton@gmail.com> Cc: richard -rw- weinberger <richard.weinberger@gmail.com> Acked-by: WANG Cong <xiyou.wangcong@gmail.com> Cc: Jeff Dike <jdike@addtoit.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2011-01-13um: mark CONFIG_HIGHMEM as brokenRichard Weinberger
Currently CONFIG_HIGHMEM is broken on User Mode Linux. I'm not sure if it worked ever. It doesn't compile and this breaks randomconfig testing. Signed-off-by: Richard Weinberger <richard@nod.at> Cc: Jeff Dike <jdike@addtoit.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2010-11-25uml: disable winch irq before freeing handler dataWill Newton
Disable the winch irq early to make sure we don't take an interrupt part way through the freeing of the handler data, resulting in a crash on shutdown: winch_interrupt : read failed, errno = 9 fd 13 is losing SIGWINCH support ------------[ cut here ]------------ WARNING: at lib/list_debug.c:48 list_del+0xc6/0x100() list_del corruption, next is LIST_POISON1 (00100100) 082578c8: [<081fd77f>] dump_stack+0x22/0x24 082578e0: [<0807a18a>] warn_slowpath_common+0x5a/0x80 08257908: [<0807a23e>] warn_slowpath_fmt+0x2e/0x30 08257920: [<08172196>] list_del+0xc6/0x100 08257940: [<08060244>] free_winch+0x14/0x80 08257958: [<080606fb>] winch_interrupt+0xdb/0xe0 08257978: [<080a65b5>] handle_IRQ_event+0x35/0xe0 08257998: [<080a8717>] handle_edge_irq+0xb7/0x170 082579bc: [<08059bc4>] do_IRQ+0x34/0x50 082579d4: [<08059e1b>] sigio_handler+0x5b/0x80 082579ec: [<0806a374>] sig_handler_common+0x44/0xb0 08257a68: [<0806a538>] sig_handler+0x38/0x50 08257a78: [<0806a77c>] handle_signal+0x5c/0xa0 08257a9c: [<0806be28>] hard_handler+0x18/0x20 08257aac: [<00c14400>] 0xc14400 Signed-off-by: Will Newton <will.newton@gmail.com> Acked-by: WANG Cong <xiyou.wangcong@gmail.com> Cc: Jeff Dike <jdike@addtoit.com> Cc: <stable@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2010-11-17BKL: remove extraneous #include <smp_lock.h>Arnd Bergmann
The big kernel lock has been removed from all these files at some point, leaving only the #include. Remove this too as a cleanup. Signed-off-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2010-11-12um: fix ptrace build errorRichard Weinberger
Both commits 0a3d763f1a68 ("ptrace: cleanup arch_ptrace() on um") and 9b05a69e0534 ("ptrace: change signature of arch_ptrace()") broke the um build. This patch fixes the issues. 0a3d763f1a68 introduced the undeclared variable "datavp". The patch seems completely untested. :-( 9b05a69e0534 changed arch_ptrace()'s signature but did not update um/include/asm/ptrace-generic.h. Signed-off-by: Richard Weinberger <richard@nod.at> Cc: Namhyung Kim <namhyung@gmail.com> Cc: Jeff Dike <jdike@addtoit.com> Tested-by: Will Newton <will.newton@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2010-10-28Merge branch 'kconfig' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/mmarek/kbuild-2.6 * 'kconfig' of git://git.kernel.org/pub/scm/linux/kernel/git/mmarek/kbuild-2.6: (38 commits) kbuild: convert `arch/tile' to the kconfig mainmenu upgrade README: cite nconfig Revert "kconfig: Temporarily disable dependency warnings" kconfig: Use PATH_MAX instead of 128 for path buffer sizes. kconfig: Fix realloc usage() kconfig: Propagate const kconfig: Don't go out from read config loop when you read new symbol kconfig: fix menuconfig on debian lenny kbuild: migrate all arch to the kconfig mainmenu upgrade kconfig: expand file names kconfig: use the file's name of sourced file kconfig: constify file name kconfig: don't emit warning upon rootmenu's prompt redefinition kconfig: replace KERNELVERSION usage by the mainmenu's prompt kconfig: delay gconf window initialization kconfig: expand by default the rootmenu's prompt kconfig: add a symbol string expansion helper kconfig: regen parser kconfig: implement the `mainmenu' directive kconfig: allow PACKAGE to be defined on the compiler's command-line ... Fix up trivial conflict in arch/mn10300/Kconfig
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