- 16 Dec, 2008 1 commit
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Hiroshi Shimamoto authored
Impact: cleanup Replace incrementing irq stat with inc_irq_stat() in non-unified functions. Signed-off-by:
Hiroshi Shimamoto <h-shimamoto@ct.jp.nec.com> Signed-off-by:
Ingo Molnar <mingo@elte.hu>
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- 12 Dec, 2008 2 commits
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Hiroshi Shimamoto authored
Impact: cleanup Introduce inc_irq_stat() macro and unify irq_stat accounting code. Signed-off-by:
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Ingo Molnar authored
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- 10 Dec, 2008 37 commits
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Linus Torvalds authored
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Linus Torvalds authored
Merge branch 'sched-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip * 'sched-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip: sched: CPU remove deadlock fix
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Hugh Dickins authored
Lee Schermerhorn noticed yesterday that I broke the mapping_writably_mapped test in 2.6.7! Bad bad bug, good good find. The i_mmap_writable count must be incremented for VM_SHARED (just as i_writecount is for VM_DENYWRITE, but while holding the i_mmap_lock) when dup_mmap() copies the vma for fork: it has its own more optimal version of __vma_link_file(), and I missed this out. So the count was later going down to 0 (dangerous) when one end unmapped, then wrapping negative (inefficient) when the other end unmapped. The only impact on x86 would have been that setting a mandatory lock on a file which has at some time been opened O_RDWR and mapped MAP_SHARED (but not necessarily PROT_WRITE) across a fork, might fail with -EAGAIN when it should succeed, or succeed when it should fail. But those architectures which rely on flush_dcache_page() to flush userspace modifications back into the page before the kernel reads it, may in some cases have skipped the flush after such a fork - though any repetitive test will soon wrap the count negative, in which case it will flush_dcache_page() unnecessarily. Fix would be a two-liner, but mapping variable added, and comment moved. Reported-by:
Lee Schermerhorn <Lee.Schermerhorn@hp.com> Signed-off-by:
Hugh Dickins <hugh@veritas.com> Signed-off-by:
Linus Torvalds <torvalds@linux-foundation.org>
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git://git.kernel.org/pub/scm/linux/kernel/git/frob/linux-2.6-rolandLinus Torvalds authored
* 'to-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/frob/linux-2.6-roland: tracehook: exec double-reporting fix
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Manfred Spraul authored
The last patch to lib/idr.c caused a bug if idr_get_new_above() was called on an empty idr. Usually, nodes stay on the same layer. New layers are added to the top of the tree. The exception is idr_get_new_above() on an empty tree: In this case, the new root node is first added on layer 0, then moved upwards. p->layer was not updated. As usual: You shall never rely on the source code comments, they will only mislead you. Signed-off-by:
Manfred Spraul <manfred@colorfullife.com> Signed-off-by:
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Akira Takeuchi authored
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:
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Akira Takeuchi authored
Fix __put_user_asm8() by jumping to the end label (3:) from the exception handler, rather than jumping back to retry the second store instruction (label 2:). Signed-off-by:
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Akira Takeuchi authored
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:
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Akira Takeuchi authored
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: -
Cyrill Gorcunov authored
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:
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git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6Linus Torvalds authored
* git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6: crypto: api - Disallow cryptomgr as a module if algorithms are built-in
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git://git.kernel.org/pub/scm/linux/kernel/git/jbarnes/pci-2.6Linus Torvalds authored
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jbarnes/pci-2.6: PCIe: ASPM: Break out of endless loop waiting for PCI config bits to switch PCI: stop leaking 'slot_name' in pci_create_slot
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git://git.kernel.org/pub/scm/linux/kernel/git/aegl/linux-2.6Linus Torvalds authored
* 'release' of git://git.kernel.org/pub/scm/linux/kernel/git/aegl/linux-2.6: [IA64] SN: prevent IRQ retargetting in request_irq() [IA64] Fix section mismatch ioc3uart_init()/ioc3uart_submodule [IA64] Clear up section mismatch for ioc4_ide_attach_one. [IA64] Clear up section mismatch with arch_unregister_cpu() [IA64] Clear up section mismatch for sn_check_wars. [IA64] Updated the generic_defconfig to work with the 2.6.28-rc7 kernel. [IA64] Fix GRU compile error w/o CONFIG_HUGETLB_PAGE [IA64] eliminate NULL test and memset after alloc_bootmem [IA64] remove BUILD_BUG_ON from paravirt_getreg()
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git://ftp.linux-mips.org/pub/scm/upstream-linusLinus Torvalds authored
* 'upstream' of git://ftp.linux-mips.org/pub/scm/upstream-linus: MIPS: Better than nothing implementation of PCI mmap to fix X.
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Kay Sievers authored
The pktcdvd created class devices only export some sysfs files, but have no char dev_t registered in the driver. At class device creation time they copy the dev_t value of the block device to the char device, wich will register a new char device in the driver core and userspace, with a conflicting dev_t value. In many cases the class devices dev_t just points to a random USB device. This fixes the sysfs "duplicate entry" errors. Signed-off-by:
Kay Sievers <kay.sievers@vrfy.org> Acked-by:
Peter Osterlund <petero2@telia.com> Cc: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by:
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git://git.kernel.org/pub/scm/linux/kernel/git/ieee1394/linux1394-2.6Linus Torvalds authored
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ieee1394/linux1394-2.6: firewire: fw-ohci: fix IOMMU resource exhaustion ieee1394: node manager causes up to ~3.25s delay in freezing tasks
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Andrew Morton authored
sparc64: drivers/video/mb862xx/mb862xxfb.c:929: warning: long long unsigned int format, resource_size_t arg (arg 4) drivers/video/mb862xx/mb862xxfb.c:931: warning: long long unsigned int format, resource_size_t arg (arg 4) We don't know what type the architecture uses to implement u64, hence they cannot be printed. Cc: Anatolij Gustschin <agust@denx.de> Cc: Dmitry Baryshkov <dbaryshkov@gmail.com> Cc: Anton Vorontsov <avorontsov@ru.mvista.com> Cc: Matteo Fortini <m.fortini@selcomgroup.com> Cc: Krzysztof Helt <krzysztof.h1@poczta.fm> Signed-off-by:
Andrew Morton <akpm@linux-foundation.org> Signed-off-by:
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Hugh Dickins authored
Miles Lane tailing /sys files hit a BUG which Pekka Enberg has tracked to my 966c8c12 sprint_symbol(): use less stack exposing a bug in slub's list_locations() - kallsyms_lookup() writes a 0 to namebuf[KSYM_NAME_LEN-1], but that was beyond the end of page provided. The 100 slop which list_locations() allows at end of page looks roughly enough for all the other stuff it might print after the symbol before it checks again: break out KSYM_SYMBOL_LEN earlier than before. Latencytop and ftrace and are using KSYM_NAME_LEN buffers where they need KSYM_SYMBOL_LEN buffers, and vmallocinfo a 2*KSYM_NAME_LEN buffer where it wants a KSYM_SYMBOL_LEN buffer: fix those before anyone copies them. [akpm@linux-foundation.org: ftrace.h needs module.h] Signed-off-by:
Pekka Enberg <penberg@cs.helsinki.fi> Acked-by:
Steven Rostedt <srostedt@redhat.com> Acked-by:
Frederic Weisbecker <fweisbec@gmail.com> Cc: Rusty Russell <rusty@rustcorp.com.au> Signed-off-by:
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Dmitri Monakhov authored
On umount two event will be dispatched to watcher: 1: inotify_dev_queue_event(.., IN_UNMOUNT,..) 2: remove_watch(watch, dev) ->inotify_dev_queue_event(.., IN_IGNORED, ..) But if watcher has IN_ONESHOT bit set then the watcher will be released inside first event. Which result in accessing invalid object later. IMHO it is not pure regression. This bug wasn't triggered while initial inotify interface testing phase because of another bug in IN_ONESHOT handling logic :) commit ac74c00e Author: Ulisses Furquim <ulissesf@gmail.com> Date: Fri Feb 8 04:18:16 2008 -0800 inotify: fix check for one-shot watches before destroying them As the IN_ONESHOT bit is never set when an event is sent we must check it in the watch's mask and not in the event's mask. TESTCASE: mkdir mnt mount -ttmpfs none mnt mkdir mnt/d ./inotify mnt/d& umount mnt ## << lockup or crash here TESTSOURCE: /* gcc -oinotify inotify.c */ #include <stdio.h> #include <stdlib.h> #include <sys/inotify.h> int main(int argc, char **argv) { char buf[1024]; struct inotify_event *ie; char *p; int i; ssize_t l; p = argv[1]; i = inotify_init(); inotify_add_watch(i, p, ~0); l = read(i, buf, sizeof(buf)); printf("read %d bytes\n", l); ie = (struct inotify_event *) buf; printf("event mask: %d\n", ie->mask); return 0; } Signed-off-by:Dmitri Monakhov <dmonakhov@openvz.org> Cc: John McCutchan <ttb@tentacle.dhs.org> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: Robert Love <rlove@google.com> Cc: Ulisses Furquim <ulissesf@gmail.com> Signed-off-by:
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Eric Dumazet authored
atomic_long_xchg() is not correctly defined for 32bit arches. Signed-off-by:
Eric Dumazet <dada1@cosmosbay.com> Cc: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca> Signed-off-by:
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Brice Goglin authored
Since commit 2f007e74, do_pages_stat() gets the page address from user-space and puts the corresponding status back while holding the mmap_sem for read. There is no need to hold mmap_sem there while some page-faults may occur. This patch adds a temporary address and status buffer so as to only hold mmap_sem while working on these kernel buffers. This is implemented by extracting do_pages_stat_array() out of do_pages_stat(). Signed-off-by:
Brice Goglin <Brice.Goglin@inria.fr> Cc: Christoph Lameter <clameter@sgi.com> Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Cc: Nick Piggin <npiggin@suse.de> Cc: Hugh Dickins <hugh@veritas.com> Signed-off-by:
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Balaji Rao authored
Signed-off-by:
Balaji Rao <balajirrao@gmail.com> Acked-by:
Ben Dooks <ben-linux@fluff.org> Signed-off-by:
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Matt Mackall authored
The large pages fix from bcf8039e broke 32-bit pagemap by pulling the pagemap entry code out into a function with the wrong return type. Pagemap entries are 64 bits on all systems and unsigned long is only 32 bits on 32-bit systems. Signed-off-by:
Matt Mackall <mpm@selenic.com> Reported-by:
Doug Graham <dgraham@nortel.com> Cc: Alexey Dobriyan <adobriyan@gmail.com> Cc: Dave Hansen <dave@linux.vnet.ibm.com> Cc: <stable@kernel.org> [2.6.26.x, 2.6.27.x] Signed-off-by:
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KAMEZAWA Hiroyuki authored
Fix a total bootup freeze on ia64. Signed-off-by:
KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Tested-by:
Li Zefan <lizf@cn.fujitsu.com> Reported-by:
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Randy Dunlap authored
Fix build error when RTC_INTF_DEV=n: drivers/rtc/rtc-twl4030.c:402: error: 'twl4030_rtc_ioctl' undeclared here (not in a function) make[3]: *** [drivers/rtc/rtc-twl4030.o] Error 1 Signed-off-by:
Randy Dunlap <randy.dunlap@oracle.com> Cc: David Brownell <dbrownell@users.sourceforge.net> Cc: Tony Lindgren <tony@atomide.com> Cc: Samuel Ortiz <sameo@openedhand.com> Signed-off-by:
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Geoff Levand authored
Add a call to cancel_work_sync() in fbcon_exit() to cancel any pending work in the fbcon workqueue. The current implementation of fbcon_exit() sets the fbcon workqueue function info->queue.func to NULL, but does not assure that there is no work pending when it does so. On occasion, depending on system timing, there will still be pending work in the queue when fbcon_exit() is called. This results in a null pointer deference when run_workqueue() tries to call the queue's work function. Fixes errors on shutdown similar to these: Console: switching to colour dummy device 80x25 Unable to handle kernel paging request for data at address 0x00000000 Signed-off-by:
Geoff Levand <geoffrey.levand@am.sony.com> Cc: Krzysztof Helt <krzysztof.h1@poczta.fm> Cc: Geert Uytterhoeven <geert@linux-m68k.org> Signed-off-by:
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KOSAKI Motohiro authored
Currently, lru_add_drain_all() has two version. (1) use schedule_on_each_cpu() (2) don't use schedule_on_each_cpu() Gerald Schaefer reported it doesn't work well on SMP (not NUMA) S390 machine. offline_pages() calls lru_add_drain_all() followed by drain_all_pages(). While drain_all_pages() works on each cpu, lru_add_drain_all() only runs on the current cpu for architectures w/o CONFIG_NUMA. This let us run into the BUG_ON(!PageBuddy(page)) in __offline_isolated_pages() during memory hotplug stress test on s390. The page in question was still on the pcp list, because of a race with lru_add_drain_all() and drain_all_pages() on different cpus. Actually, Almost machine has CONFIG_UNEVICTABLE_LRU=y. Then almost machine use (1) version lru_add_drain_all although the machine is UP. Then this ifdef is not valueable. simple removing is better. Signed-off-by:
KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> Cc: Christoph Lameter <cl@linux-foundation.org> Cc: Lee Schermerhorn <Lee.Schermerhorn@hp.com> Acked-by:
Gerald Schaefer <gerald.schaefer@de.ibm.com> Cc: Dave Hansen <dave@linux.vnet.ibm.com> Signed-off-by:
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Andrew Morton authored
Revert commit e8ced39d Author: Mingming Cao <cmm@us.ibm.com> Date: Fri Jul 11 19:27:31 2008 -0400 percpu_counter: new function percpu_counter_sum_and_set As described in revert "percpu counter: clean up percpu_counter_sum_and_set()" the new percpu_counter_sum_and_set() is racy against updates to the cpu-local accumulators on other CPUs. Revert that change. This means that ext4 will be slow again. But correct. Reported-by: -
Andrew Morton authored
Revert commit 1f7c14c6 Author: Mingming Cao <cmm@us.ibm.com> Date: Thu Oct 9 12:50:59 2008 -0400 percpu counter: clean up percpu_counter_sum_and_set() Before this patch we had the following: percpu_counter_sum(): return the percpu_counter's value percpu_counter_sum_and_set(): return the percpu_counter's value, copying that value into the central value and zeroing the per-cpu counters before returning. After this patch, percpu_counter_sum_and_set() has gone, and percpu_counter_sum() gets the old percpu_counter_sum_and_set() functionality. Problem is, as Eric points out, the old percpu_counter_sum_and_set() functionality was racy and wrong. It zeroes out counters on "other" cpus, without holding any locks which will prevent races agaist updates from those other CPUS. This patch reverts 1f7c14c6. This means that percpu_counter_sum_and_set() still has the race, but percpu_counter_sum() does not. Note that this is not a simple revert - ext4 has since started using percpu_counter_sum() for its dirty_blocks counter as well. Note that this revert patch changes percpu_counter_sum() semantics. Before the patch, a call to percpu_counter_sum() will bring the counter's central counter mostly up-to-date, so a following percpu_counter_read() will return a close value. After this patch, a call to percpu_counter_sum() will leave the counter's central accumulator unaltered, so a subsequent call to percpu_counter_read() can now return a significantly inaccurate result. If there is any code in the tree which was introduced after e8ced39d was merged, and which depends upon the new percpu_counter_sum() semantics, that code will break. Reported-by: -
Eric Dumazet authored
We should first delete the counter from percpu_counters list before freeing memory, or a percpu_counter_hotcpu_callback() could dereference a NULL pointer. Signed-off-by:
David S. Miller <davem@davemloft.net> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Mingming Cao <cmm@us.ibm.com> Signed-off-by:
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Alessandro Zummo authored
Add missing id_table to the drivers in subject. Patch is against the latest git. It should go in with 2.6.28 if possible, the drivers won't work without the id_table bits. Signed-off-by:
Alessandro Zummo <a.zummo@towertech.it> Reported-by:
Imre Kaloz <kaloz@openwrt.org> Tested-by:
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Tom Zanussi authored
Running kmemtraced, which uses splice() on relayfs, causes a hard lock on x86-64 SMP. As described by Tom Zanussi: It looks like you hit the same problem as described here: commit 8191ecd1 splice: fix infinite loop in generic_file_splice_read() relay uses the same loop but it never got noticed or fixed. Cc: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca> Tested-by:
Tom Zanussi <tzanussi@gmail.com> Signed-off-by:
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Balbir Singh authored
mconsole_init() passed 256 bytes as length in os_create_unix_socket, while the sizeof UNIX_PATH_MAX is 108. This patch fixes that problem and avoids a big overrun bug reported on UML bootup. sockaddr_un.sun_path is UNIX_PATH_MAX long which causes the problem. Reported-by:
Vikas K Managutte <vikki.km@gmail.com> Reported-by:
Sarvesh Kumar Lal Das <skldas@gmail.com> Signed-off-by:
Balbir Singh <balbir@linux.vnet.ibm.com> Reviewed-by:
WANG Cong <wangcong@zeuux.org> Cc: Jeff Dike <jdike@addtoit.com> Cc: <stable@kernel.org> [please check with Jeff] Signed-off-by:
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Andrew Morton authored
On second thoughts, this is just going to disturb people while telling us things which we already knew. Cc: Peter Korsgaard <jacmet@sunsite.dk> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Kay Sievers <kay.sievers@vrfy.org> Cc: David Woodhouse <dwmw2@infradead.org> Signed-off-by:
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Herbert Xu authored
If we have at least one algorithm built-in then it no longer makes sense to have the testing framework, and hence cryptomgr to be a module. It should be either on or off, i.e., built-in or disabled. This just happens to stop a potential runaway modprobe loop that seems to trigger on at least one distro. With fixes from Evgeniy Polyakov. Signed-off-by:Herbert Xu <herbert@gondor.apana.org.au>
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Stefan Richter authored
There is a DMA map/ unmap imbalance whenever a block write request packet is sent and then dequeued with ohci_cancel_packet. The latter may happen frequently if the AR resp tasklet is executed before the AT req tasklet for the same transaction. Add the missing dma_unmap_single. This fixes https://bugzilla.redhat.com/show_bug.cgi?id=475156 Reported-by: Emmanuel Kowalski Tested-by: Emmanuel Kowalski Signed-off-by:
Stefan Richter <stefanr@s5r6.in-berlin.de>
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Roland McGrath authored
The patch 6341c393 "tracehook: exec" introduced a small regression in 2.6.27 regarding binfmt_misc exec event reporting. Since the reporting is now done in the common search_binary_handler() function, an exec of a misc binary will result in two (or possibly multiple) exec events being reported, instead of just a single one, because the misc handler contains a recursive call to search_binary_handler. To add to the confusion, if PTRACE_O_TRACEEXEC is not active, the multiple SIGTRAP signals will in fact cause only a single ptrace intercept, as the signals are not queued. However, if PTRACE_O_TRACEEXEC is on, the debugger will actually see multiple ptrace intercepts (PTRACE_EVENT_EXEC). The test program included below demonstrates the problem. This change fixes the bug by calling tracehook_report_exec() only in the outermost search_binary_handler() call (bprm->recursion_depth == 0). The additional change to restore bprm->recursion_depth after each binfmt load_binary call is actually superfluous for this bug, since we test the value saved on entry to search_binary_handler(). But it keeps the use of of the depth count to its most obvious expected meaning. Depending on what binfmt handlers do in certain cases, there could have been false-positive tests for recursion limits before this change. /* Test program using PTRACE_O_TRACEEXEC. This forks and exec's the first argument with the rest of the arguments, while ptrace'ing. It expects to see one PTRACE_EVENT_EXEC stop and then a successful exit, with no other signals or events in between. Test for kernel doing two PTRACE_EVENT_EXEC stops for a binfmt_misc exec: $ gcc -g traceexec.c -o traceexec $ sudo sh -c 'echo :test:M::foobar::/bin/cat: > /proc/sys/fs/binfmt_misc/register' $ echo 'foobar test' > ./foobar $ chmod +x ./foobar $ ./traceexec ./foobar; echo $? ==> good <== foobar test 0 $ ==> bad <== foobar test unexpected status 0x4057f != 0 3 $ */ #include <stdio.h> #include <sys/types.h> #include <sys/wait.h> #include <sys/ptrace.h> #include <unistd.h> #include <signal.h> #include <stdlib.h> static void wait_for (pid_t child, int expect) { int status; pid_t p = wait (&status); if (p != child) { perror ("wait"); exit (2); } if (status != expect) { fprintf (stderr, "unexpected status %#x != %#x\n", status, expect); exit (3); } } int main (int argc, char **argv) { pid_t child = fork (); if (child < 0) { perror ("fork"); return 127; } else if (child == 0) { ptrace (PTRACE_TRACEME); raise (SIGUSR1); execv (argv[1], &argv[1]); perror ("execve"); _exit (127); } wait_for (child, W_STOPCODE (SIGUSR1)); if (ptrace (PTRACE_SETOPTIONS, child, 0L, (void *) (long) PTRACE_O_TRACEEXEC) != 0) { perror ("PTRACE_SETOPTIONS"); return 4; } if (ptrace (PTRACE_CONT, child, 0L, 0L) != 0) { perror ("PTRACE_CONT"); return 5; } wait_for (child, W_STOPCODE (SIGTRAP | (PTRACE_EVENT_EXEC << 8))); if (ptrace (PTRACE_CONT, child, 0L, 0L) != 0) { perror ("PTRACE_CONT"); return 6; } wait_for (child, W_EXITCODE (0, 0)); return 0; } Reported-by:
Arnd Bergmann <arnd@arndb.de> CC: Ulrich Weigand <ulrich.weigand@de.ibm.com> Signed-off-by:
Roland McGrath <roland@redhat.com>
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