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2011-12-30Revert "clockevents: Set noop handler in clockevents_exchange_device()"Linus Torvalds
This reverts commit de28f25e8244c7353abed8de0c7792f5f883588c. It results in resume problems for various people. See for example http://thread.gmane.org/gmane.linux.kernel/1233033 http://thread.gmane.org/gmane.linux.kernel/1233389 http://thread.gmane.org/gmane.linux.kernel/1233159 http://thread.gmane.org/gmane.linux.kernel/1227868/focus=1230877 and the fedora and ubuntu bug reports https://bugzilla.redhat.com/show_bug.cgi?id=767248 https://bugs.launchpad.net/ubuntu/+source/linux/+bug/904569 which got bisected down to the stable version of this commit. Reported-by: Jonathan Nieder <jrnieder@gmail.com> Reported-by: Phil Miller <mille121@illinois.edu> Reported-by: Philip Langdale <philipl@overt.org> Reported-by: Tim Gardner <tim.gardner@canonical.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Greg KH <gregkh@suse.de> Cc: stable@kernel.org # for stable kernels that applied the original Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2011-12-30Merge git://www.linux-watchdog.org/linux-watchdogLinus Torvalds
* git://www.linux-watchdog.org/linux-watchdog: watchdog: iTCO_wdt.c - problems with newer hardware due to SMI clearing (part 2) watchdog: hpwdt: Changes to handle NX secure bit in 32bit path watchdog: sp805: Fix section mismatch in ID table. watchdog: move coh901327 state holders
2011-12-29Merge branch 'iommu/fixes' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/joro/iommu * 'iommu/fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/joro/iommu: iommu: Initialize domain->handler in iommu_domain_alloc()
2011-12-29Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/netLinus Torvalds
* git://git.kernel.org/pub/scm/linux/kernel/git/davem/net: packet: fix possible dev refcnt leak when bind fail netem: dont call vfree() under spinlock and BH disabled netfilter: ctnetlink: fix scheduling while atomic if helper is autoloaded netfilter: ctnetlink: fix return value of ctnetlink_get_expect()
2011-12-29Merge branch 'perf-urgent-for-linus' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip * 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: perf/x86: Fix raw_spin_unlock_irqrestore() usage oprofile, arm/sh: Fix oprofile_arch_exit() linkage issue
2011-12-29Merge branch 'for-linus' of git://oss.sgi.com/xfs/xfsLinus Torvalds
* 'for-linus' of git://oss.sgi.com/xfs/xfs: xfs: log all dirty inodes in xfs_fs_sync_fs xfs: log the inode in ->write_inode calls for kupdate
2011-12-29Merge branch 'for-linus' of git://git.kernel.dk/linux-blockLinus Torvalds
* 'for-linus' of git://git.kernel.dk/linux-block: block: fix blk_queue_end_tag() block: re-use existing 'reading' variable instead of checking direction again block, cfq: fix empty queue crash caused by request merge
2011-12-29mm: hugetlb: fix non-atomic enqueue of huge pageHillf Danton
If a huge page is enqueued under the protection of hugetlb_lock, then the operation is atomic and safe. Signed-off-by: Hillf Danton <dhillf@gmail.com> Reviewed-by: Michal Hocko <mhocko@suse.cz> Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Cc: <stable@vger.kernel.org> [2.6.37+] Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2011-12-29procfs: do not confuse jiffies with cputime64_tAndreas Schwab
Commit 2a95ea6c0d129b4 ("procfs: do not overflow get_{idle,iowait}_time for nohz") did not take into account that one some architectures jiffies and cputime use different units. This causes get_idle_time() to return numbers in the wrong units, making the idle time fields in /proc/stat wrong. Instead of converting the usec value returned by get_cpu_{idle,iowait}_time_us to units of jiffies, use the new function usecs_to_cputime64 to convert it to the correct unit of cputime64_t. Signed-off-by: Andreas Schwab <schwab@linux-m68k.org> Acked-by: Michal Hocko <mhocko@suse.cz> Cc: Arnd Bergmann <arnd@arndb.de> Cc: "Artem S. Tashkinov" <t.artem@mailcity.com> Cc: Dave Jones <davej@redhat.com> Cc: Alexey Dobriyan <adobriyan@gmail.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: "Luck, Tony" <tony.luck@intel.com> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2011-12-29mm/mempolicy.c: refix mbind_range() vma issueKOSAKI Motohiro
commit 8aacc9f550 ("mm/mempolicy.c: fix pgoff in mbind vma merge") is the slightly incorrect fix. Why? Think following case. 1. map 4 pages of a file at offset 0 [0123] 2. map 2 pages just after the first mapping of the same file but with page offset 2 [0123][23] 3. mbind() 2 pages from the first mapping at offset 2. mbind_range() should treat new vma is, [0123][23] |23| mbind vma but it does [0123][23] |01| mbind vma Oops. then, it makes wrong vma merge and splitting ([01][0123] or similar). This patch fixes it. [testcase] test result - before the patch case4: 126: test failed. expect '2,4', actual '2,2,2' case5: passed case6: passed case7: passed case8: passed case_n: 246: test failed. expect '4,2', actual '1,4' ------------[ cut here ]------------ kernel BUG at mm/filemap.c:135! invalid opcode: 0000 [#4] SMP DEBUG_PAGEALLOC (snip long bug on messages) test result - after the patch case4: passed case5: passed case6: passed case7: passed case8: passed case_n: passed source: mbind_vma_test.c ============================================================ #include <numaif.h> #include <numa.h> #include <sys/mman.h> #include <stdio.h> #include <unistd.h> #include <stdlib.h> #include <string.h> static unsigned long pagesize; void* mmap_addr; struct bitmask *nmask; char buf[1024]; FILE *file; char retbuf[10240] = ""; int mapped_fd; char *rubysrc = "ruby -e '\ pid = %d; \ vstart = 0x%llx; \ vend = 0x%llx; \ s = `pmap -q #{pid}`; \ rary = []; \ s.each_line {|line|; \ ary=line.split(\" \"); \ addr = ary[0].to_i(16); \ if(vstart <= addr && addr < vend) then \ rary.push(ary[1].to_i()/4); \ end; \ }; \ print rary.join(\",\"); \ '"; void init(void) { void* addr; char buf[128]; nmask = numa_allocate_nodemask(); numa_bitmask_setbit(nmask, 0); pagesize = getpagesize(); sprintf(buf, "%s", "mbind_vma_XXXXXX"); mapped_fd = mkstemp(buf); if (mapped_fd == -1) perror("mkstemp "), exit(1); unlink(buf); if (lseek(mapped_fd, pagesize*8, SEEK_SET) < 0) perror("lseek "), exit(1); if (write(mapped_fd, "\0", 1) < 0) perror("write "), exit(1); addr = mmap(NULL, pagesize*8, PROT_NONE, MAP_SHARED, mapped_fd, 0); if (addr == MAP_FAILED) perror("mmap "), exit(1); if (mprotect(addr+pagesize, pagesize*6, PROT_READ|PROT_WRITE) < 0) perror("mprotect "), exit(1); mmap_addr = addr + pagesize; /* make page populate */ memset(mmap_addr, 0, pagesize*6); } void fin(void) { void* addr = mmap_addr - pagesize; munmap(addr, pagesize*8); memset(buf, 0, sizeof(buf)); memset(retbuf, 0, sizeof(retbuf)); } void mem_bind(int index, int len) { int err; err = mbind(mmap_addr+pagesize*index, pagesize*len, MPOL_BIND, nmask->maskp, nmask->size, 0); if (err) perror("mbind "), exit(err); } void mem_interleave(int index, int len) { int err; err = mbind(mmap_addr+pagesize*index, pagesize*len, MPOL_INTERLEAVE, nmask->maskp, nmask->size, 0); if (err) perror("mbind "), exit(err); } void mem_unbind(int index, int len) { int err; err = mbind(mmap_addr+pagesize*index, pagesize*len, MPOL_DEFAULT, NULL, 0, 0); if (err) perror("mbind "), exit(err); } void Assert(char *expected, char *value, char *name, int line) { if (strcmp(expected, value) == 0) { fprintf(stderr, "%s: passed\n", name); return; } else { fprintf(stderr, "%s: %d: test failed. expect '%s', actual '%s'\n", name, line, expected, value); // exit(1); } } /* AAAA PPPPPPNNNNNN might become PPNNNNNNNNNN case 4 below */ void case4(void) { init(); sprintf(buf, rubysrc, getpid(), mmap_addr, mmap_addr+pagesize*6); mem_bind(0, 4); mem_unbind(2, 2); file = popen(buf, "r"); fread(retbuf, sizeof(retbuf), 1, file); Assert("2,4", retbuf, "case4", __LINE__); fin(); } /* AAAA PPPPPPNNNNNN might become PPPPPPPPPPNN case 5 below */ void case5(void) { init(); sprintf(buf, rubysrc, getpid(), mmap_addr, mmap_addr+pagesize*6); mem_bind(0, 2); mem_bind(2, 2); file = popen(buf, "r"); fread(retbuf, sizeof(retbuf), 1, file); Assert("4,2", retbuf, "case5", __LINE__); fin(); } /* AAAA PPPPNNNNXXXX might become PPPPPPPPPPPP 6 */ void case6(void) { init(); sprintf(buf, rubysrc, getpid(), mmap_addr, mmap_addr+pagesize*6); mem_bind(0, 2); mem_bind(4, 2); mem_bind(2, 2); file = popen(buf, "r"); fread(retbuf, sizeof(retbuf), 1, file); Assert("6", retbuf, "case6", __LINE__); fin(); } /* AAAA PPPPNNNNXXXX might become PPPPPPPPXXXX 7 */ void case7(void) { init(); sprintf(buf, rubysrc, getpid(), mmap_addr, mmap_addr+pagesize*6); mem_bind(0, 2); mem_interleave(4, 2); mem_bind(2, 2); file = popen(buf, "r"); fread(retbuf, sizeof(retbuf), 1, file); Assert("4,2", retbuf, "case7", __LINE__); fin(); } /* AAAA PPPPNNNNXXXX might become PPPPNNNNNNNN 8 */ void case8(void) { init(); sprintf(buf, rubysrc, getpid(), mmap_addr, mmap_addr+pagesize*6); mem_bind(0, 2); mem_interleave(4, 2); mem_interleave(2, 2); file = popen(buf, "r"); fread(retbuf, sizeof(retbuf), 1, file); Assert("2,4", retbuf, "case8", __LINE__); fin(); } void case_n(void) { init(); sprintf(buf, rubysrc, getpid(), mmap_addr, mmap_addr+pagesize*6); /* make redundunt mappings [0][1234][34][7] */ mmap(mmap_addr + pagesize*4, pagesize*2, PROT_READ|PROT_WRITE, MAP_FIXED|MAP_SHARED, mapped_fd, pagesize*3); /* Expect to do nothing. */ mem_unbind(2, 2); file = popen(buf, "r"); fread(retbuf, sizeof(retbuf), 1, file); Assert("4,2", retbuf, "case_n", __LINE__); fin(); } int main(int argc, char** argv) { case4(); case5(); case6(); case7(); case8(); case_n(); return 0; } ============================================================= Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> Acked-by: Johannes Weiner <hannes@cmpxchg.org> Cc: Minchan Kim <minchan.kim@gmail.com> Cc: Caspar Zhang <caspar@casparzhang.com> Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> Cc: Christoph Lameter <cl@linux.com> Cc: Hugh Dickins <hugh.dickins@tiscali.co.uk> Cc: Mel Gorman <mel@csn.ul.ie> Cc: Lee Schermerhorn <lee.schermerhorn@hp.com> Cc: <stable@vger.kernel.org> [3.1.x] Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2011-12-29gspca: Fix bulk mode cameras no longer working (regression fix)Hans de Goede
The new iso bandwidth calculation code accidentally has broken support for bulk mode cameras. This has broken the following drivers: finepix, jeilinj, ovfx2, ov534, ov534_9, se401, sq905, sq905c, sq930x, stv0680, vicam. Thix patch fixes this. Fix tested with: se401, sq905, sq905c, stv0680 & vicam cams. Signed-off-by: Hans de Goede <hdegoede@redhat.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2011-12-29Input: sentelic - fix retrieving number of buttonsTai-hwa Liang
Fixing wrong register offset which is used to retrieve the number of buttons attached to the hardware. Signed-off-by: Tai-hwa Liang <avatar@sentelic.com> Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
2011-12-29ceph: disable use of dcache for readdir etc.Sage Weil
Ceph attempts to use the dcache to satisfy negative lookups and readdir when the entire directory contents are in cache. Disable this behavior until lingering bugs in this code are shaken out; we'll re-enable these hooks once things are fully stable. Signed-off-by: Sage Weil <sage@newdream.net>
2011-12-29block: fix blk_queue_end_tag()Dan Williams
Commit 5e081591 "block: warn if tag is greater than real_max_depth" cleaned up blk_queue_end_tag() to warn when the tag is truly invalid (greater than real_max_depth). However, it changed behavior in the tag < max_depth case to not end the request. Leading to triggering of BUG_ON(blk_queued_rq(rq)) in the request completion path: http://marc.info/?l=linux-kernel&m=132204370518629&w=2 In order to allow blk_queue_resize_tags() to shrink the tag space blk_queue_end_tag() must always complete tags with a value less than real_max_depth regardless of the current max_depth. The comment about "handling the shrink case" seems to be what prompted changes in this space, so remove it and BUG on all invalid tags (made even simpler by Matthew's suggestion to use an unsigned compare). Signed-off-by: Dan Williams <dan.j.williams@intel.com> Cc: Tao Ma <boyu.mt@taobao.com> Cc: Matthew Wilcox <matthew@wil.cx> Reported-by: Meelis Roos <mroos@ut.ee> Reported-by: Ed Nadolski <edmund.nadolski@intel.com> Cc: Tejun Heo <tj@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Jens Axboe <axboe@kernel.dk>
2011-12-28ARM: EXYNOS: Remove duplicated SROMC static memory mappingThomas Abraham
SROMC static memory mapping is included in the common s5p initialization code. Hence, remove the duplicated SROMC static memory mapping for EXYNOS. Signed-off-by: Thomas Abraham <thomas.abraham@linaro.org> Cc: stable@kernel.org Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>
2011-12-28ARM: SAMSUNG: Fix build error when selecting CPU_FREQ_S3C24XX_DEBUGFS on S3C2440Denis Kuzmenko
Following is happened when CONFIG_CPU_FREQ_S3C24XX_DEBUGFS is selected without building of s3c2410-iotiming.c file: arch/arm/mach-s3c2440/built-in.o:(.data+0x38c): undefined reference to `s3c2410_iotiming_debugfs Basically, the CONFIG_S3C2410_IOTIMING is not selected for MACH_MINI2440. Because the s3c2410-iotiming.c is not ever compiled and enabling CONFIG_CPU_FREQ_S3C24XX_DEBUGFS option caused undefined reference to s3c2410_iotiming_debugfs() defined in that file. The s3c2410_iotiming_debugfs defined as NULL for this case. Signed-off-by: Denis Kuzmenko <linux@solonet.org.ua> Cc: stable@kernel.org [kgene.kim@samsung.com: removed useless changes] Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>
2011-12-27packet: fix possible dev refcnt leak when bind failWei Yongjun
If bind is fail when bind is called after set PACKET_FANOUT sock option, the dev refcnt will leak. Signed-off-by: Wei Yongjun <yongjun_wei@trendmicro.com.cn> Signed-off-by: David S. Miller <davem@davemloft.net>
2011-12-27watchdog: iTCO_wdt.c - problems with newer hardware due to SMI clearing (part 2)Wim Van Sebroeck
Redhat Bugzilla: Bug 727875 - TCO_EN bit is disabled by TCO driver The previous patch breaks reset watchdog behaviour on the older hardware. It is therefor better to make sure that the behaviour for older hardware (<=ICH5 or 6300ESB) is preserved and that the behaviour for newer hardware is changed. We therefor use the iTCO_version to see if we need the clearing of the SMI_TCO_EN bit in the SMI_EN register. So the new behaviour becomes: turn_SMI_watchdog_clear_off=0 -> Do not turn off SMI clearing watchdog. turn_SMI_watchdog_clear_off=1 -> Turn off SMI clearing watchdog when iTCO_version=1 (ICHO till ICH5 + 6300ESB only) turn_SMI_watchdog_clear_off=2 -> Turn off SMI clearing watchdog. Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
2011-12-26drm/i915: Disable RC6 on Sandybridge by defaultKeith Packard
RC6 fails again. > I found my system freeze mostly during starting up X and KDE. Sometimes it > works for some minutes, sometimes it freezes immediatly. When the freeze > happens, everything is dead (even the reset button does not work, I need to > power cycle). > I disabled RC6, and my system runs wonderfully. > The system is a Z68 Pro board with Sandybridge i5-2500K processor, 8 > GB of RAM and UEFI firmware. Reported-by: Kai Krakow <hurikhan77@gmail.com> Signed-off-by: Keith Packard <keithp@keithp.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2011-12-26drm/i915: Disable semaphores by default on SNBKeith Packard
Semaphores still cause problems on some machines: > From Udo Steinberg: > > With Linux-3.2-rc6 I'm frequently seeing GPU hangs when large amounts of > text scroll in an xterm, such as when extracting a tar archive. Such as this > one (note the timestamps): > > I can reproduce it fairly easily with something > as simple as: > > while true; do dmesg; done This patch turns them off on SNB while leaving them on for IVB. Reported-by: Udo Steinberg <udo@hypervisor.org> Cc: Daniel Vetter <daniel@ffwll.ch> Cc: Eugeni Dodonov <eugeni@dodonov.net> Signed-off-by: Keith Packard <keithp@keithp.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2011-12-26Merge branch 'kvm-updates/3.2' of git://git.kernel.org/pub/scm/virt/kvm/kvmLinus Torvalds
* 'kvm-updates/3.2' of git://git.kernel.org/pub/scm/virt/kvm/kvm: KVM: PPC: e500: include linux/export.h KVM: PPC: fix kvmppc_start_thread() for CONFIG_SMP=N KVM: PPC: protect use of kvmppc_h_pr KVM: PPC: move compute_tlbie_rb to book3s_64 common header KVM: Don't automatically expose the TSC deadline timer in cpuid KVM: Device assignment permission checks KVM: Remove ability to assign a device without iommu support KVM: x86: Prevent starting PIT timers in the absence of irqchip support
2011-12-26Merge tag 'for-linus' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/ieee1394/linux1394 post 3.2-rc7 pull request * tag 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ieee1394/linux1394: MAINTAINERS: firewire git URL update
2011-12-26vfs: fix handling of lock allocation failure in lease-break caseLinus Torvalds
Bruce Fields notes that commit 778fc546f749 ("locks: fix tracking of inprogress lease breaks") introduced a possible error pointer dereference on failure to allocate memory. locks_conflict() will dereference the passed-in new lease lock structure that may be an error pointer. This means an open (without O_NONBLOCK set) on a file with a lease applied (generally only done when Samba or nfsd (with v4) is running) could crash if a kmalloc() fails. So instead of playing games with IS_ERROR() all over the place, just check the allocation failure early. That makes the code more straightforward, and avoids this possible bad pointer dereference. Based-on-patch-by: J. Bruce Fields <bfields@redhat.com> Cc: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2011-12-26watchdog: hpwdt: Changes to handle NX secure bit in 32bit pathMingarelli, Thomas
This patch makes use of the set_memory_x() kernel API in order to make necessary BIOS calls to source NMIs. This is needed for SLES11 SP2 and the latest upstream kernel as it appears the NX Execute Disable has grown in its control. Signed-off by: Thomas Mingarelli <thomas.mingarelli@hp.com> Signed-off by: Wim Van Sebroeck <wim@iguana.be> Cc: stable@kernel.org
2011-12-26watchdog: sp805: Fix section mismatch in ID table.Nick Bowler
The AMBA ID table is marked as __initdata, yet it is referenced by the driver struct which is not. This causes a (somewhat unhelpful) section mismatch warning: WARNING: drivers/watchdog/sp805_wdt.o(.data+0x4c): Section mismatch in reference from the variable sp805_wdt_driver to the (unknown reference) .init.data:(unknown) Fix this by removing the annotation. Signed-off-by: Nick Bowler <nbowler@elliptictech.com> Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
2011-12-26watchdog: move coh901327 state holdersLinus Walleij
The state holders used in the PM path of the drivers report as unused variables when compiling without CONFIG_PM so let's move them inside CONFIG_PM. Signed-off-by: Linus Walleij <linus.walleij@linaro.org> Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
2011-12-26KVM: PPC: e500: include linux/export.hScott Wood
This is required for THIS_MODULE. We recently stopped acquiring it via some other header. Signed-off-by: Scott Wood <scottwood@freescale.com> Signed-off-by: Alexander Graf <agraf@suse.de>
2011-12-26KVM: PPC: fix kvmppc_start_thread() for CONFIG_SMP=NMichael Neuling
Currently kvmppc_start_thread() tries to wake other SMT threads via xics_wake_cpu(). Unfortunately xics_wake_cpu only exists when CONFIG_SMP=Y so when compiling with CONFIG_SMP=N we get: arch/powerpc/kvm/built-in.o: In function `.kvmppc_start_thread': book3s_hv.c:(.text+0xa1e0): undefined reference to `.xics_wake_cpu' The following should be fine since kvmppc_start_thread() shouldn't called to start non-zero threads when SMP=N since threads_per_core=1. Signed-off-by: Michael Neuling <mikey@neuling.org> Signed-off-by: Alexander Graf <agraf@suse.de>
2011-12-26KVM: PPC: protect use of kvmppc_h_prAndreas Schwab
kvmppc_h_pr is only available if CONFIG_KVM_BOOK3S_64_PR. Signed-off-by: Andreas Schwab <schwab@linux-m68k.org> Signed-off-by: Alexander Graf <agraf@suse.de>
2011-12-26KVM: PPC: move compute_tlbie_rb to book3s_64 common headerAndreas Schwab
compute_tlbie_rb is only used on ppc64 and cannot be compiled on ppc32. Signed-off-by: Andreas Schwab <schwab@linux-m68k.org> Signed-off-by: Alexander Graf <agraf@suse.de>
2011-12-26KVM: Don't automatically expose the TSC deadline timer in cpuidJan Kiszka
Unlike all of the other cpuid bits, the TSC deadline timer bit is set unconditionally, regardless of what userspace wants. This is broken in several ways: - if userspace doesn't use KVM_CREATE_IRQCHIP, and doesn't emulate the TSC deadline timer feature, a guest that uses the feature will break - live migration to older host kernels that don't support the TSC deadline timer will cause the feature to be pulled from under the guest's feet; breaking it - guests that are broken wrt the feature will fail. Fix by not enabling the feature automatically; instead report it to userspace. Because the feature depends on KVM_CREATE_IRQCHIP, which we cannot guarantee will be called, we expose it via a KVM_CAP_TSC_DEADLINE_TIMER and not KVM_GET_SUPPORTED_CPUID. Fixes the Illumos guest kernel, which uses the TSC deadline timer feature. [avi: add the KVM_CAP + documentation] Reported-by: Alexey Zaytsev <alexey.zaytsev@gmail.com> Tested-by: Alexey Zaytsev <alexey.zaytsev@gmail.com> Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com> Signed-off-by: Avi Kivity <avi@redhat.com>
2011-12-25KVM: Device assignment permission checksAlex Williamson
Only allow KVM device assignment to attach to devices which: - Are not bridges - Have BAR resources (assume others are special devices) - The user has permissions to use Assigning a bridge is a configuration error, it's not supported, and typically doesn't result in the behavior the user is expecting anyway. Devices without BAR resources are typically chipset components that also don't have host drivers. We don't want users to hold such devices captive or cause system problems by fencing them off into an iommu domain. We determine "permission to use" by testing whether the user has access to the PCI sysfs resource files. By default a normal user will not have access to these files, so it provides a good indication that an administration agent has granted the user access to the device. [Yang Bai: add missing #include] [avi: fix comment style] Signed-off-by: Alex Williamson <alex.williamson@redhat.com> Signed-off-by: Yang Bai <hamo.by@gmail.com> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2011-12-25KVM: Remove ability to assign a device without iommu supportAlex Williamson
This option has no users and it exposes a security hole that we can allow devices to be assigned without iommu protection. Make KVM_DEV_ASSIGN_ENABLE_IOMMU a mandatory option. Signed-off-by: Alex Williamson <alex.williamson@redhat.com> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2011-12-25KVM: x86: Prevent starting PIT timers in the absence of irqchip supportJan Kiszka
User space may create the PIT and forgets about setting up the irqchips. In that case, firing PIT IRQs will crash the host: BUG: unable to handle kernel NULL pointer dereference at 0000000000000128 IP: [<ffffffffa10f6280>] kvm_set_irq+0x30/0x170 [kvm] ... Call Trace: [<ffffffffa11228c1>] pit_do_work+0x51/0xd0 [kvm] [<ffffffff81071431>] process_one_work+0x111/0x4d0 [<ffffffff81071bb2>] worker_thread+0x152/0x340 [<ffffffff81075c8e>] kthread+0x7e/0x90 [<ffffffff815a4474>] kernel_thread_helper+0x4/0x10 Prevent this by checking the irqchip mode before starting a timer. We can't deny creating the PIT if the irqchips aren't set up yet as current user land expects this order to work. Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2011-12-25MAINTAINERS: firewire git URL updateStefan Richter
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
2011-12-24Merge branch 'drm-fixes' of git://people.freedesktop.org/~airlied/linuxLinus Torvalds
* 'drm-fixes' of git://people.freedesktop.org/~airlied/linux: vmwgfx: fix incorrect VRAM size check in vmw_kms_fb_create() drm/radeon/kms: bail on BTC parts if MC ucode is missing
2011-12-24Merge branch 'nf' of git://1984.lsi.us.es/netDavid S. Miller
2011-12-24netem: dont call vfree() under spinlock and BH disabledEric Dumazet
commit 6373a9a286 (netem: use vmalloc for distribution table) added a regression, since vfree() is called while holding a spinlock and BH being disabled. Fix this by doing the pointers swap in critical section, and freeing after spinlock release. Also add __GFP_NOWARN to the kmalloc() try, since we fallback to vmalloc(). Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com> Acked-by: Stephen Hemminger <shemminger@vyatta.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2011-12-24netfilter: ctnetlink: fix scheduling while atomic if helper is autoloadedPablo Neira Ayuso
This patch fixes one scheduling while atomic error: [ 385.565186] ctnetlink v0.93: registering with nfnetlink. [ 385.565349] BUG: scheduling while atomic: lt-expect_creat/16163/0x00000200 It can be triggered with utils/expect_create included in libnetfilter_conntrack if the FTP helper is not loaded. Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
2011-12-24netfilter: ctnetlink: fix return value of ctnetlink_get_expect()Pablo Neira Ayuso
This fixes one bogus error that is returned to user-space: libnetfilter_conntrack/utils# ./expect_get TEST: get expectation (-1)(Unknown error 18446744073709551504) This patch includes the correct handling for EAGAIN (nfnetlink uses this error value to restart the operation after module auto-loading). Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
2011-12-23Linux 3.2-rc7HEADv3.2-rc7masterLinus Torvalds
2011-12-23Merge branch 'for-linus' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs: VFS: Fix race between CPU hotplug and lglocks
2011-12-23Merge tag 'writeback' of git://git.kernel.org/pub/scm/linux/kernel/git/wfg/linuxLinus Torvalds
for linus: writeback reason binary tracing format fix * tag 'writeback' of git://git.kernel.org/pub/scm/linux/kernel/git/wfg/linux: writeback: show writeback reason with __print_symbolic
2011-12-23Merge branch 'rc-fixes' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/mmarek/kbuild * 'rc-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/mmarek/kbuild: kconfig: adapt update-po-config to new UML layout
2011-12-23Merge branch 'v4l_for_linus' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-media * 'v4l_for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-media: [media] omap3isp: Fix crash caused by subdevs now having a pointer to devnodes
2011-12-23Merge branch 'for-linus' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/mason/linux-btrfs * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mason/linux-btrfs: Btrfs: call d_instantiate after all ops are setup Btrfs: fix worker lock misuse in find_worker
2011-12-23Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/sparcLinus Torvalds
* git://git.kernel.org/pub/scm/linux/kernel/git/davem/sparc: sparc64: Fix MSIQ HV call ordering in pci_sun4v_msiq_build_irq().
2011-12-23Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/netLinus Torvalds
* git://git.kernel.org/pub/scm/linux/kernel/git/davem/net: netfilter: xt_connbytes: handle negation correctly net: relax rcvbuf limits rps: fix insufficient bounds checking in store_rps_dev_flow_table_cnt() net: introduce DST_NOPEER dst flag mqprio: Avoid panic if no options are provided bridge: provide a mtu() method for fake_dst_ops
2011-12-23ARM: 7237/1: PL330: Fix driver freezeJavi Merino
Add a req_running field to the pl330_thread to track which request (if any) has been submitted to the DMA. This mechanism replaces the old one in which we tried to guess the same by looking at the PC of the DMA, which could prevent the driver from sending more requests if it didn't guess correctly. Reference: <1323631637-9610-1-git-send-email-javi.merino@arm.com> Signed-off-by: Javi Merino <javi.merino@arm.com> Acked-by: Jassi Brar <jaswinder.singh@linaro.org> Tested-by: Tushar Behera <tushar.behera@linaro.org> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2011-12-23xfs: log all dirty inodes in xfs_fs_sync_fsChristoph Hellwig
Since Linux 2.6.36 the writeback code has introduces various measures for live lock prevention during sync(). Unfortunately some of these are actively harmful for the XFS model, where the inode gets marked dirty for metadata from the data I/O handler. The older_than_this checks that are now more strictly enforced since writeback: avoid livelocking WB_SYNC_ALL writeback by only calling into __writeback_inodes_sb and thus only sampling the current cut off time once. But on a slow enough devices the previous asynchronous sync pass might not have fully completed yet, and thus XFS might mark metadata dirty only after that sampling of the cut off time for the blocking pass already happened. I have not myself reproduced this myself on a real system, but by introducing artificial delay into the XFS I/O completion workqueues it can be reproduced easily. Fix this by iterating over all XFS inodes in ->sync_fs and log all that are dirty. This might log inode that only got redirtied after the previous pass, but given how cheap delayed logging of inodes is it isn't a major concern for performance. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Dave Chinner <dchinner@redhat.com> Tested-by: Mark Tinguely <tinguely@sgi.com> Reviewed-by: Mark Tinguely <tinguely@sgi.com> Signed-off-by: Ben Myers <bpm@sgi.com>