- 23 Aug, 2007 40 commits
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Ian Kent authored
Due to inconsistent locking in the VFS between calls to lookup and revalidate deadlock can occur in the automounter. The inconsistency is that the directory inode mutex is held for both lookup and revalidate calls when called via lookup_hash whereas it is held only for lookup during a path walk. Consequently, if the mutex is held during a call to revalidate autofs4 can't release the mutex to callback the daemon as it can't know whether it owns the mutex. This situation happens when a process tries to create a directory within an automount and a second process also tries to create the same directory between the lookup and the mkdir. Since the first process has dropped the mutex for the daemon callback, the second process takes it during revalidate leading to deadlock between the autofs daemon and the second process when the daemon tries to create the mount point directory. After spending quite a bit of time trying to resolve this on more than one occassion, using rather complex and ulgy approaches, it turns out that just delaying the hashing of the dentry until the create operation works fine. Signed-off-by:
Ian Kent <raven@themaw.net> Signed-off-by:
Andrew Morton <akpm@linux-foundation.org> Signed-off-by:
Linus Torvalds <torvalds@linux-foundation.org>
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Jeff Dike authored
The previous patch which limited the number of sectors in a single request to a COWed device was correct in concept, but the limit was implemented in the wrong place. By putting it in ubd_add, it covered the cases where the COWing was specified on the command line. However, when the command line only has the COW file specified, the fact that it's a COW file isn't known until it's opened, so the limit is missed in these cases. This patch moves the sector limit from ubd_add to ubd_open_dev. Signed-off-by:
Jeff Dike <jdike@linux.intel.com> Cc: <stable@kernel.org> Signed-off-by:
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NeilBrown authored
When a raid1 array is reshaped (number of drives changed), the list of devices is compacted, so that slots for missing devices are filled with working devices from later slots. This requires the "rd%d" symlinks in sysfs to be updated. Signed-off-by:
Neil Brown <neilb@suse.de> Signed-off-by:
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NeilBrown authored
Commit 17571284 was slightly bad. If an array has a write-intent bitmap, and you remove a drive, then readd it, only the changed parts should be resynced. However after the above commit, this only works if the array has not been shut down and restarted. This is because it sets 'fullsync' at little more often than it should. This patch is more careful. Signed-off-by:
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Evgeniy Polyakov authored
In case bus master driver provided bogus value as its private data, search can be incorrect. Problem found by Adrian Bunk. Signed-off-by:
Evgeniy Polyakov <johnpol@2ka.mipt.ru> Cc: Adrian Bunk <bunk@stusta.de> Signed-off-by:
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Adam Litke authored
It seems a simple mistake was made when converting follow_hugetlb_page() over to the VM_FAULT flags bitmasks (in "mm: fault feedback #2", commit 83c54070). By using the wrong bitmask, hugetlb_fault() failures are not being recognized. This results in an infinite loop whenever follow_hugetlb_page is involved in a failed fault. Signed-off-by:
Adam Litke <agl@us.ibm.com> Acked-by:
Nick Piggin <npiggin@suse.de> Signed-off-by:
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Paul Fulghum authored
Get module reference on open() by generic HDLC to prevent module from unloading while interface is active. Signed-off-by:
Paul Fulghum <paulkf@microgate.com> Signed-off-by:
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Siddha, Suresh B authored
Skip calling cache_free_alien() when the platform is not numa capable. This will avoid cache misses that happen while accessing slabp (which is per page memory reference) to get nodeid. Instead use a global variable to skip the call, which is mostly likely to be present in the cache. This gives a 0.8% performance boost with the database oltp workload on a quad-core SMP platform and by any means the number is not small :) Signed-off-by:
Suresh Siddha <suresh.b.siddha@intel.com> Acked-by:
Christoph Lameter <clameter@sgi.com> Signed-off-by:
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Mijo Safradin authored
trivial change: fix warning Signed-off-by:
Mijo Safradin <safradin@de.ibm.com> Acked-by:
Christian Krafft <krafft@de.ibm.com> Signed-off-by:
Corey Minyard <cminyard@mvista.com> Signed-off-by:
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Oleg Nesterov authored
With this patch any thread can dequeue its own private signals via signalfd, even if it was created by another sub-thread. To do so, we pass "current" to dequeue_signal() if the caller is from the same thread group. This also fixes the scheduling of posix timers broken by the previous patch. If the caller doesn't belong to this thread group, we can't handle __SI_TIMER case properly anyway. Perhaps we should forbid the cross-process signalfd usage and convert ctx->tsk to ctx->sighand. Signed-off-by:
Oleg Nesterov <oleg@tv-sign.ru> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Davide Libenzi <davidel@xmailserver.org> Cc: Ingo Molnar <mingo@elte.hu> Cc: Michael Kerrisk <mtk-manpages@gmx.net> Cc: Roland McGrath <roland@redhat.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: <stable@kernel.org> Signed-off-by:
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Oleg Nesterov authored
dequeue_signal: if (__SI_TIMER) { spin_unlock(&tsk->sighand->siglock); do_schedule_next_timer(info); spin_lock(&tsk->sighand->siglock); } Unless tsk == curent, this is absolutely unsafe: nothing prevents tsk from exiting. If signalfd was passed to another process, do_schedule_next_timer() is just wrong. Add yet another "tsk == current" check into dequeue_signal(). This patch fixes an oopsable bug, but breaks the scheduling of posix timers if the shared __SI_TIMER signal was fetched via signalfd attached to another sub-thread. Mostly fixed by the next patch. Signed-off-by: -
Oleg Nesterov authored
sys_timer_create() sets ->it_process and unlocks ->siglock, then checks tmr->it_sigev_notify to define if get_task_struct() is needed. We already passed ->it_id to the caller, another thread can delete this timer and free its memory in between. As a minimal fix, move this code under ->siglock, sys_timer_delete() takes it too before calling release_posix_timer(). A proper serialization would be to take ->it_lock, we add a partly initialized timer on posix_timers_id, not good. Signed-off-by:
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Thomas Gleixner authored
timer_delete does: lock_timer(); timer->it_process = NULL; unlock_timer(); release_posix_timer(); timer->it_process is checked in lock_timer() to prevent access to a timer, which is on the way to be deleted, but the check happens after idr_lock is dropped. This allows release_posix_timer() to delete the timer before the lock code can check the timer: CPU 0 CPU 1 lock_timer(); timer->it_process = NULL; unlock_timer(); lock_timer() spin_lock(idr_lock); timer = idr_find(); spin_lock(timer->lock); spin_unlock(idr_lock); release_posix_timer(); spin_lock(idr_lock); idr_remove(timer); spin_unlock(idr_lock); free_timer(timer); if (timer->......) Change the locking to prevent this. Signed-off-by:
Thomas Gleixner <tglx@linutronix.de> Signed-off-by:
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Geert Uytterhoeven authored
Introduce CONFIG_CHECK_SIGNATURE to control inclusion of check_signature() and avoid problems on platforms that don't have readb(). Let the few legacy (ISA || PCI || X86) drivers that need check_signature() select CONFIG_CHECK_SIGNATURE. Signed-off-by:
Geert Uytterhoeven <geert@linux-m68k.org> Cc: Jeff Dike <jdike@addtoit.com> Cc: Heiko Carstens <heiko.carstens@de.ibm.com> Cc: Roman Zippel <zippel@linux-m68k.org> Cc: Alan Cox <alan@lxorguk.ukuu.org.uk> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: Russell King <rmk@arm.linux.org.uk> Signed-off-by:
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Geert Uytterhoeven authored
m68k/mac: Make mac_hid_mouse_emulate_buttons() declaration visible drivers/char/keyboard.c: In function 'kbd_keycode': drivers/char/keyboard.c:1142: error: implicit declaration of function 'mac_hid_mouse_emulate_buttons' The forward declaration of mac_hid_mouse_emulate_buttons() is not visible on m68k because it's hidden in the middle of a big #ifdef block. Move it to <linux/kbd_kern.h>, correct the type of the second parameter, and include <linux/kbd_kern.h> where needed. Signed-off-by:
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Geert Uytterhoeven authored
zorro: Make the sysfs `config' attribute read-only, as you cannot write to it (there's no .write function neither). Signed-off-by:
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Geert Uytterhoeven authored
m68k: Fix a few hickups in drivers/scsi/Kconfig Signed-off-by:
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Roman Zippel authored
Don't include RODATA into text segment as it includes the kallsyms data and can cause spurious link failures (layout differences can change the number of symbols in kallsyms, i.e. when a symbol is equal to _etext it's not included). Signed-off-by:
Roman Zippel <zippel@linux-m68k.org> Signed-off-by:
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Alan Cox authored
Add the needed constants and defines to activate the existing code. Signed-off-by:
Alan Cox <alan@redhat.com> Signed-off-by:
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Geert Uytterhoeven authored
m68k: Use _AC() instead of #ifdef __ASSEMBLY__ hackery when needed, remove hackery when unused. Signed-off-by:
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Johannes Berg authored
When suspend is ever implemented for pmu68k it really should follow the generic pm_ops concept and not mirror the platform-specific /dev/pmu device with ioctls on it. Hence, this patch removes the unused code there; should the implementers need it they can look at via-pmu.c and/or the history of the file. Signed-off-by:
Johannes Berg <johannes@sipsolutions.net> Signed-off-by:
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Roman Zippel authored
Remove an unnecessary m68k_memoffset export and initialization Signed-off-by:
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Geert Uytterhoeven authored
Kill a superfluous extern declaration Signed-off-by:
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Geert Uytterhoeven authored
m68k: <asm/page.h> needs <linux/compiler.h> because of __attribute_const__ Signed-off-by:
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Alan Cox authored
The new exec code inserts an accounted vma into an mm struct which is not current->mm. The existing memory check code has a hard coded assumption that this does not happen as does the security code. As the correct mm is known we pass the mm to the security method and the helper function. A new security test is added for the case where we need to pass the mm and the existing one is modified to pass current->mm to avoid the need to change large amounts of code. (Thanks to Tobias for fixing rejects and testing) Signed-off-by:
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David Brownell authored
The new rtc-m41t80 driver name doesn't match its module name, which prevents it from properly hotplugging. Since it's new, no platforms yet depend on that name ... so this patch fixes the driver name to match its module name, rather than going the other way around with a MODULE_ALIAS(). NOTE: This sort of bug is a new thing to watch out for with new-style I2C drivers; previously I2C couldn't hotplug. Signed-off-by:
David Brownell <dbrownell@users.sourceforge.net> Acked-by:
Atsushi Nemoto <anemo@mba.ocn.ne.jp> Signed-off-by:
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Andy Whitcroft authored
Lumpy reclaim works by selecting a lead page from the LRU list and then selecting pages for reclaim from the order-aligned area of pages. In the situation were all pages in that region are inactive and not referenced by any process over time, it works well. In the situation where there is even light load on the system, the pages may not free quickly. Out of a area of 1024 pages, maybe only 950 of them are freed when the allocation attempt occurs because lumpy reclaim returned early. This patch alters the behaviour of direct reclaim for large contiguous blocks. The first attempt to call shrink_page_list() is asynchronous but if it fails, the pages are submitted a second time and the calling process waits for the IO to complete. This may stall allocators waiting for contiguous memory but that should be expected behaviour for high-order users. It is preferable behaviour to potentially queueing unnecessary areas for IO. Note that kswapd will not stall in this fashion. [apw@shadowen.org: update to version 2] [apw@shadowen.org: update to version 3] Signed-off-by:
Mel Gorman <mel@csn.ul.ie> Signed-off-by:
Andy Whitcroft <apw@shadowen.org> Signed-off-by:
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Andy Whitcroft authored
As pointed out by Mel when reclaim is applied at higher orders a significant amount of IO may be started. As this takes finite time to drain reclaim will consider more areas than ultimatly needed to satisfy the request. This leads to more reclaim than strictly required and reduced success rates. I was able to confirm Mel's test results on systems locally. These show that even under light load the success rates drop off far more than expected. Testing with a modified version of his patch (which follows) I was able to allocate almost all of ZONE_MOVABLE with a near idle system. I ran 5 test passes sequentially following system boot (the system has 29 hugepages in ZONE_MOVABLE): 2.6.23-rc1 11 8 6 7 7 sync_lumpy 28 28 29 29 26 These show that although hugely better than the near 0% success normally expected we can only allocate about a 1/4 of the zone. Using synchronous reclaim for these allocations we get close to 100% as expected. I have also run our standard high order tests and these show no regressions in allocation success rates at rest, and some significant improvements under load. This patch: We are transitioning pages from active to inactive in clear_active_flags, those need counting as PGDEACTIVATE vm events. Signed-off-by:
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Yoshinori Sato authored
Build error fix. Signed-off-by:
Yoshinori Sato <ysato@users.sourceforge.jp> Signed-off-by:
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Michael Neuling authored
Commit b663a79c ("taskstats: add context-switch counters") incorrectly removed a comma from a printf statement. This causes corruption in the output printing or a seg fault. Signed-off-by:
Michael Neuling <mikey@neuling.org> Acked-by:
Balbir Singh <balbir@linux.vnet.ibm.com> Signed-off-by:
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Andrew Morton authored
If we're going to run the handler from free_irq() then we must do it with local irq's disabled. Otherwise lockdep complains that the handler is taking irq-safe spinlocks in a non-irq-safe fashion. Cc: Ingo Molnar <mingo@elte.hu> Cc: David Woodhouse <dwmw2@infradead.org> Signed-off-by:
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Christian Schmidt authored
The serial_pci driver tries to guess serial ports on unknown devices based on the PCI class (modem or serial). On certain softmodems (AC'97 modems) this can lead to the recognition of non-existing serial ports. This patch adds a blacklist of PCI IDs that are to be ignored by the driver. [akpm@linux-foundation.org: cleanups] Signed-off-by:
Christian Schmidt <schmidt@digadd.de> Cc: Bjorn Helgaas <bjorn.helgaas@hp.com> Cc: Russell King <rmk+lkml@arm.linux.org.uk> Cc: Yinghai Lu <yinghai.lu@sun.com> Acked-by:
Alan Cox <alan@lxorguk.ukuu.org.uk> Signed-off-by:
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Corey Minyard authored
Reading the LSR clears the break, parity, frame error, and overrun bits in the 8250 chip, but these are not being saved in all places that read the LSR. Same goes for the MSR delta bits. Save the LSR bits off whenever the lsr is read so they can be handled later in the receive routine. Save the MSR bits to be handled in the modem status routine. Also, clear the stored bits and clear the interrupt registers before enabling interrupts, to avoid handling old values of the stored bits in the interrupt routines. [akpm@linux-foundation.org: clean up pre-existing code] Signed-off-by:
Corey Minyard <minyard@acm.org> Cc: Russell King <rmk+lkml@arm.linux.org.uk> Cc: Yinghai Lu <yinghai.lu@sun.com> Cc: Bjorn Helgaas <bjorn.helgaas@hp.com> Acked-by:
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Atsushi Nemoto authored
This chip does not have modem control lines. Return TIOCM_CAR and TIOCM_DSR always on get_mctrl() and ajust some bits in termios cflag. Signed-off-by:
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Niels de Vos authored
Add support for the it887x-chips (PCI) manufactured by ITE. Signed-off-by:
Niels de Vos <niels.devos@wincor-nixdorf.com> Cc: Russell King <rmk@arm.linux.org.uk> Acked-by:
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David Woodhouse authored
The uart_set_termios() function will bail out early without bothering to touch the hardware, if it decides that nothing "relevant" has changed. Unfortunately, its idea of "relevant" doesn't include c_[io]speed. So if the baud rate bits are BOTHER and you just change the speed, the change gets optimised away. This patch makes it ignore the old Bfoo bits in c_cflag and just check whether c_ispeed and c_ospeed have changed. Those integers are always set appropriately for us by set_termios(). Signed-off-by:
David Woodhouse <dwmw2@infradead.org> Acked-by:
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john stultz authored
Avoid futex_unlock_pi returning -EFAULT (which results in deadlock), by clearing uval before jumping to retry_locked. Signed-off-by:
John Stultz <johnstul@us.ibm.com> Acked-by:
Steven Rostedt <rostedt@goodmis.org> Cc: Ingo Molnar <mingo@elte.hu> Cc: Thomas Gleixner <tglx@linutronix.de> Signed-off-by:
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Lee Schermerhorn authored
I couldn't find any memory policy documentation in the Documentation directory, so here is my attempt to document it. There's lots more that could be written about the internal design--including data structures, functions, etc. However, if you agree that this is better that the nothing that exists now, perhaps it could be merged. This will provide a baseline for updates to document the many policy patches that are currently being worked. Signed-off-by:
Lee Schermerhorn <lee.schermerhorn@hp.com> Cc: Christoph Lameter <clameter@sgi.com> Cc: Andi Kleen <ak@suse.de> Cc: Michael Kerrisk <mtk-manpages@gmx.net> Acked-by:
Rob Landley <rob@landley.net> Acked-by:
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Adrian Bunk authored
This patch fixes an off-by-one in a BUG_ON() spotted by the Coverity checker. Signed-off-by:
Adrian Bunk <bunk@stusta.de> Cc: Amy Griffis <amy.griffis@hp.com> Cc: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by:
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Kent Yoder authored
Fix up the maintainers info in the tpm drivers. Kylene will be out for some time, so copying the sourceforge list is the best way to get some attention. Cc: Marcel Selhorst <tpm@selhorst.net> Cc: Kylene Jo Hall <kjhall@us.ibm.com> Signed-off-by:
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