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2010-10-11oprofile, ARM: Use oprofile_arch_exit() to cleanup on failureRobert Richter
There is duplicate cleanup code in the init and exit functions. Now, oprofile_arch_exit() is also used if oprofile_arch_init() fails. Acked-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Robert Richter <robert.richter@amd.com>
2010-10-11oprofile, ARM: Rework op_create_counter()Robert Richter
This patch simplifies op_create_counter(). Removing if/else if paths and return code variable by direct returning from function. Acked-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Robert Richter <robert.richter@amd.com>
2010-10-11oprofile, ARM: Remove some goto statementsRobert Richter
This patch removes some unnecessary goto statements. Acked-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Robert Richter <robert.richter@amd.com>
2010-10-11Merge branch 'oprofile/core' (early part) into oprofile/perfRobert Richter
Conflicts: arch/arm/oprofile/common.c Signed-off-by: Robert Richter <robert.richter@amd.com>
2010-10-11oprofile, ARM: Release resources on failureRobert Richter
This patch fixes a resource leak on failure, where the oprofilefs and some counters may not released properly. Signed-off-by: Robert Richter <robert.richter@amd.com> Acked-by: Will Deacon <will.deacon@arm.com> Cc: linux-arm-kernel@lists.infradead.org Cc: <stable@kernel.org> # .35.x LKML-Reference: <20100929145225.GJ13563@erda.amd.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2010-10-11Merge branch 'oprofile/urgent' (early part) into oprofile/perfRobert Richter
2010-10-11sh: oprofile: Use perf-events oprofile backendMatt Fleming
Now that we've got a generic perf-events based oprofile backend we might as well make use of it seeing as SH doesn't do anything special with its oprofile backend. Also introduce a new CONFIG_HW_PERF_EVENTS symbol so that we can fallback to using the timer interrupt for oprofile if the CPU doesn't support perf events. Also, to avoid a section mismatch warning we need to annotate oprofile_arch_exit() with an __exit marker. Signed-off-by: Matt Fleming <matt@console-pimps.org> Acked-by: Paul Mundt <lethal@linux-sh.org> Signed-off-by: Robert Richter <robert.richter@amd.com>
2010-10-11oprofile: Abstract the perf-events backendMatt Fleming
Move the perf-events backend from arch/arm/oprofile into drivers/oprofile so that the code can be shared between architectures. This allows each architecture to maintain only a single copy of the PMU accessor functions instead of one for both perf and OProfile. It also becomes possible for other architectures to delete much of their OProfile code in favour of the common code now available in drivers/oprofile/oprofile_perf.c. Signed-off-by: Matt Fleming <matt@console-pimps.org> Tested-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Robert Richter <robert.richter@amd.com>
2010-10-11ARM: oprofile: Move non-ARM code into separate init/exitMatt Fleming
In preparation for moving the majority of this oprofile code into an architecture-neutral place separate the architecture-independent code into oprofile_perf_init() and oprofile_perf_exit(). Signed-off-by: Matt Fleming <matt@console-pimps.org> Tested-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Robert Richter <robert.richter@amd.com>
2010-10-11ARM: oprofile: Rename op_arm to oprofile_perfMatt Fleming
In preparation for moving the generic functions out of this file, give the functions more general names (e.g. remove "arm" from the names). Signed-off-by: Matt Fleming <matt@console-pimps.org> Tested-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Robert Richter <robert.richter@amd.com>
2010-10-11oprofile: Make op_name_from_perf_id() globalMatt Fleming
Make op_name_from_perf_id() global so that we have a way for each architecture to construct an oprofile name for op->cpu_type. We need to remove the argument from the function prototype so that we can hide all implementation details inside the function. Signed-off-by: Matt Fleming <matt@console-pimps.org> Signed-off-by: Robert Richter <robert.richter@amd.com>
2010-10-11perf: New helper function for pmu nameMatt Fleming
Introduce perf_pmu_name() helper function that returns the name of the pmu. This gives us a generic way to get the name of a pmu regardless of how an architecture identifies it internally. Signed-off-by: Matt Fleming <matt@console-pimps.org> Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Acked-by: Paul Mundt <lethal@linux-sh.org> Signed-off-by: Robert Richter <robert.richter@amd.com>
2010-10-11perf: Add helper function to return number of countersMatt Fleming
The number of counters for the registered pmu is needed in a few places so provide a helper function that returns this number. Signed-off-by: Matt Fleming <matt@console-pimps.org> Tested-by: Will Deacon <will.deacon@arm.com> Acked-by: Paul Mundt <lethal@linux-sh.org> Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Signed-off-by: Robert Richter <robert.richter@amd.com>
2010-10-01oprofile, x86: Simplify init/exit functionsRobert Richter
Now, that we only call the exit function if init succeeds with commit: 979048e oprofile: don't call arch exit code from init code on failure we can simplify the x86 init/exit functions too. Variable using_nmi becomes obsolete. Signed-off-by: Robert Richter <robert.richter@amd.com>
2010-10-01oprofile, x86: Adding backtrace dump for 32bit process in compat modeJiri Olsa
This patch implements the oprofile backtrace generation for 32 bit applications running in the 64bit environment (compat mode). With this change it's possible to get backtrace for 32bits applications under the 64bits environment using oprofile's callgraph options. opcontrol --setup -c ... opreport -l -cg ... Signed-off-by: Jiri Olsa <jolsa@redhat.com> Signed-off-by: Robert Richter <robert.richter@amd.com>
2010-10-01oprofile, x86: Using struct stack_frame for 64bit processes dumpJiri Olsa
Removing unnecessary struct frame_head and replacing it with struct stack_frame. The struct stack_frame is already defined and used in other places in kernel, so there's no reason to define new structure. Signed-off-by: Jiri Olsa <jolsa@redhat.com> Signed-off-by: Robert Richter <robert.richter@amd.com>
2010-10-01Merge branch 'oprofile/urgent' into oprofile/coreRobert Richter
Conflicts: arch/arm/oprofile/common.c Signed-off-by: Robert Richter <robert.richter@amd.com>
2010-09-30oprofile, ARM: Release resources on failureRobert Richter
This patch fixes a resource leak on failure, where the oprofilefs and some counters may not released properly. Signed-off-by: Robert Richter <robert.richter@amd.com> Acked-by: Will Deacon <will.deacon@arm.com> Cc: linux-arm-kernel@lists.infradead.org Cc: <stable@kernel.org> # .35.x LKML-Reference: <20100929145225.GJ13563@erda.amd.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2010-09-27Merge branch 'urgent' of ↵Ingo Molnar
git://git.kernel.org/pub/scm/linux/kernel/git/rric/oprofile into perf/urgent
2010-09-24perf, x86: Catch spurious interrupts after disabling countersRobert Richter
Some cpus still deliver spurious interrupts after disabling a counter. This caused 'undelivered NMI' messages. This patch fixes this. Introduced by: 4177c42: perf, x86: Try to handle unknown nmis with an enabled PMU Reported-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Robert Richter <robert.richter@amd.com> Cc: Don Zickus <dzickus@redhat.com> Cc: gorcunov@gmail.com <gorcunov@gmail.com> Cc: fweisbec@gmail.com <fweisbec@gmail.com> Cc: ying.huang@intel.com <ying.huang@intel.com> Cc: ming.m.lin@intel.com <ming.m.lin@intel.com> Cc: yinghai@kernel.org <yinghai@kernel.org> Cc: andi@firstfloor.org <andi@firstfloor.org> Cc: eranian@google.com <eranian@google.com> Cc: Peter Zijlstra <peterz@infradead.org> LKML-Reference: <20100915162034.GO13563@erda.amd.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2010-09-22tracing/x86: Don't use mcount in kvmclock.cSteven Rostedt
The guest can use the paravirt clock in kvmclock.c which is used by sched_clock(), which in turn is used by the tracing mechanism for timestamps, which leads to infinite recursion. Disable mcount/tracing for kvmclock.o. Cc: stable@kernel.org Cc: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> Cc: Avi Kivity <avi@redhat.com> Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
2010-09-22tracing/x86: Don't use mcount in pvclock.cJeremy Fitzhardinge
When using a paravirt clock, pvclock.c can be used by sched_clock(), which in turn is used by the tracing mechanism for timestamps, which leads to infinite recursion. Disable mcount/tracing for pvclock.o. Cc: stable@kernel.org Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> LKML-Reference: <4C9A9A3F.4040201@goop.org> Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
2010-09-22Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/sparc-2.6Linus Torvalds
* git://git.kernel.org/pub/scm/linux/kernel/git/davem/sparc-2.6: sparc: Prevent no-handler signal syscall restart recursion. sparc: Don't mask signal when we can't setup signal frame. sparc64: Fix race in signal instruction flushing. sparc64: Support RAW perf events.
2010-09-22powerpc: fix double syscall restartsAl Viro
Make sigreturn zero regs->trap, make do_signal() do the same on all paths. As it is, signal interrupting e.g. read() from fd 512 (== ERESTARTSYS) with another signal getting unblocked when the first handler finishes will lead to restart one insn earlier than it ought to. Same for multiple signals with in-kernel handlers interrupting that sucker at the same time. Same for multiple signals of any kind interrupting that sucker on 64bit... Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Acked-by: Paul Mackerras <paulus@samba.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2010-09-22Merge branch 'for-linus' of git://git.kernel.dk/linux-2.6-blockLinus Torvalds
* 'for-linus' of git://git.kernel.dk/linux-2.6-block: bdi: Fix warnings in __mark_inode_dirty for /dev/zero and friends char: Mark /dev/zero and /dev/kmem as not capable of writeback bdi: Initialize noop_backing_dev_info properly cfq-iosched: fix a kernel OOPs when usb key is inserted block: fix blk_rq_map_kern bio direction flag cciss: freeing uninitialized data on error path
2010-09-22bdi: Fix warnings in __mark_inode_dirty for /dev/zero and friendsJan Kara
Inodes of devices such as /dev/zero can get dirty for example via utime(2) syscall or due to atime update. Backing device of such inodes (zero_bdi, etc.) is however unable to handle dirty inodes and thus __mark_inode_dirty complains. In fact, inode should be rather dirtied against backing device of the filesystem holding it. This is generally a good rule except for filesystems such as 'bdev' or 'mtd_inodefs'. Inodes in these pseudofilesystems are referenced from ordinary filesystem inodes and carry mapping with real data of the device. Thus for these inodes we have to use inode->i_mapping->backing_dev_info as we did so far. We distinguish these filesystems by checking whether sb->s_bdi points to a non-trivial backing device or not. Example: Assume we have an ext3 filesystem on /dev/sda1 mounted on /. There's a device inode A described by a path "/dev/sdb" on this filesystem. This inode will be dirtied against backing device "8:0" after this patch. bdev filesystem contains block device inode B coupled with our inode A. When someone modifies a page of /dev/sdb, it's B that gets dirtied and the dirtying happens against the backing device "8:16". Thus both inodes get filed to a correct bdi list. Cc: stable@kernel.org Signed-off-by: Jan Kara <jack@suse.cz> Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
2010-09-22char: Mark /dev/zero and /dev/kmem as not capable of writebackJan Kara
These devices don't do any writeback but their device inodes still can get dirty so mark bdi appropriately so that bdi code does the right thing and files inodes to lists of bdi carrying the device inodes. Cc: stable@kernel.org Signed-off-by: Jan Kara <jack@suse.cz> Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
2010-09-22bdi: Initialize noop_backing_dev_info properlyJan Kara
Properly initialize this backing dev info so that writeback code does not barf when getting to it e.g. via sb->s_bdi. Cc: stable@kernel.org Signed-off-by: Jan Kara <jack@suse.cz> Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
2010-09-21sparc: Prevent no-handler signal syscall restart recursion.David S. Miller
Explicitly clear the "in-syscall" bit when we have no signal handler and back up the program counters to back up the system call. Reported-by: Al Viro <viro@ZenIV.linux.org.uk> Signed-off-by: David S. Miller <davem@davemloft.net>
2010-09-21sparc: Don't mask signal when we can't setup signal frame.David S. Miller
Don't invoke the signal handler tracehook in that situation either. Reported-by: Al Viro <viro@ZenIV.linux.org.uk> Signed-off-by: David S. Miller <davem@davemloft.net>
2010-09-21Merge branch 'for-linus/i2c/2636-rc5' of git://git.fluff.org/bjdooks/linuxLinus Torvalds
* 'for-linus/i2c/2636-rc5' of git://git.fluff.org/bjdooks/linux: i2c-omap: Make sure i2c bus is free before setting it to idle
2010-09-21fs: {lock,unlock}_flocks() stubs to prepare for BKL removalSage Weil
The lock structs are currently protected by the BKL, but are accessed by code in fs/locks.c and misc file system and DLM code. These stubs will allow all users to switch to the new interface before the implementation is changed to a spinlock. Acked-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Sage Weil <sage@newdream.net> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2010-09-22i2c-omap: Make sure i2c bus is free before setting it to idleMathias Nyman
If the i2c bus receives an interrupt with both BB (bus busy) and ARDY (register access ready) statuses set during the tranfer of the last message the bus was put to idle while still busy. This caused bus to timeout. Signed-off-by: Mathias Nyman <mathias.nyman@nokia.com> Acked-by: Tony Lindgren <tony@atomide.com> Signed-off-by: Ben Dooks <ben-linux@fluff.org>
2010-09-21Merge branch 'sched-fixes-for-linus' of ↵Linus Torvalds
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: Fix nohz balance kick sched: Fix user time incorrectly accounted as system time on 32-bit
2010-09-21Merge branch 'perf-fixes-for-linus' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip * 'perf-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip: hw breakpoints: Fix pid namespace bug x86: Fix instruction breakpoint encoding oprofile: Add Support for Intel CPU Family 6 / Model 22 (Intel Celeron 540) kprobes: Fix Kconfig dependency
2010-09-21Merge branch 'for-linus' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/sage/ceph-client * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/sage/ceph-client: ceph: select CRYPTO ceph: check mapping to determine if FILE_CACHE cap is used ceph: only send one flushsnap per cap_snap per mds session ceph: fix cap_snap and realm split ceph: stop sending FLUSHSNAPs when we hit a dirty capsnap ceph: correctly set 'follows' in flushsnap messages ceph: fix dn offset during readdir_prepopulate ceph: fix file offset wrapping at 4GB on 32-bit archs ceph: fix reconnect encoding for old servers ceph: fix pagelist kunmap tail ceph: fix null pointer deref on anon root dentry release
2010-09-21Merge branch 'drm-intel-fixes' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/ickle/drm-intel * 'drm-intel-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/ickle/drm-intel: drm/i915: Hold a reference to the object whilst unbinding the eviction list drm/i915,agp/intel: Add second set of PCI-IDs for B43 drm/i915: Fix Sandybridge fence registers drm/i915/crt: Downgrade warnings for hotplug failures drm/i915: Ensure that the crtcinfo is populated during mode_fixup()
2010-09-21Merge git://git.kernel.org/pub/scm/linux/kernel/git/rusty/linux-2.6-for-linusLinus Torvalds
* git://git.kernel.org/pub/scm/linux/kernel/git/rusty/linux-2.6-for-linus: lguest: update comments to reflect LHCALL_LOAD_GDT_ENTRY. virtio: console: Prevent userspace from submitting NULL buffers virtio: console: Fix poll blocking even though there is data to read
2010-09-21sched: Fix nohz balance kickSuresh Siddha
There's a situation where the nohz balancer will try to wake itself: cpu-x is idle which is also ilb_cpu got a scheduler tick during idle and the nohz_kick_needed() in trigger_load_balance() checks for rq_x->nr_running which might not be zero (because of someone waking a task on this rq etc) and this leads to the situation of the cpu-x sending a kick to itself. And this can cause a lockup. Avoid this by not marking ourself eligible for kicking. Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com> Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> LKML-Reference: <1284400941.2684.19.camel@sbsiddha-MOBL3.sc.intel.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2010-09-21oprofile: Add Support for Intel CPU Family 6 / Model 29Jiri Olsa
This patch adds CPU type detection for dunnington processor (Family 6 / Model 29) to be identified as core 2 family cpu type (wikipedia source). I tested oprofile on Intel(R) Xeon(R) CPU E7440 reporting itself as model 29, and it runs without an issue. Spec: http://www.intel.com/Assets/en_US/PDF/specupdate/320336.pdf Signed-off-by: Jiri Olsa <jolsa@redhat.com> Acked-by: Andi Kleen <ak@linux.intel.com> Cc: stable@kernel.org Signed-off-by: Robert Richter <robert.richter@amd.com>
2010-09-21cfq-iosched: fix a kernel OOPs when usb key is insertedVivek Goyal
Mike reported a kernel crash when a usb key hotplug is performed while all kernel thrads are not in a root cgroup and are running in one of the child cgroups of blkio controller. BUG: unable to handle kernel NULL pointer dereference at 0000002c IP: [<c11c7b08>] cfq_get_queue+0x232/0x412 *pde = 00000000 Oops: 0000 [#1] PREEMPT last sysfs file: /sys/devices/pci0000:00/0000:00:1d.7/usb2/2-1/2-1:1.0/host3/scsi_host/host3/uevent [..] Pid: 30039, comm: scsi_scan_3 Not tainted 2.6.35.2-fg.roam #1 Volvi2 /Aspire 4315 EIP: 0060:[<c11c7b08>] EFLAGS: 00010086 CPU: 0 EIP is at cfq_get_queue+0x232/0x412 EAX: f705f9c0 EBX: e977abac ECX: 00000000 EDX: 00000000 ESI: f00da400 EDI: f00da4ec EBP: e977a800 ESP: dff8fd00 DS: 007b ES: 007b FS: 0000 GS: 0000 SS: 0068 Process scsi_scan_3 (pid: 30039, ti=dff8e000 task=f6b6c9a0 task.ti=dff8e000) Stack: 00000000 00000000 00000001 01ff0000 f00da508 00000000 f00da524 f00da540 <0> e7994940 dd631750 f705f9c0 e977a820 e977ac44 f00da4d0 00000001 f6b6c9a0 <0> 00000010 00008010 0000000b 00000000 00000001 e977a800 dd76fac0 00000246 Call Trace: [<c11c7f10>] ? cfq_set_request+0x228/0x34c [<c11c7ce8>] ? cfq_set_request+0x0/0x34c [<c11bb3b9>] ? elv_set_request+0xf/0x1c [<c11bdd51>] ? get_request+0x1ad/0x22f [<c11bddf2>] ? get_request_wait+0x1f/0x11a [<c11d013b>] ? kvasprintf+0x33/0x3b [<c127b537>] ? scsi_execute+0x1d/0x103 [<c127b675>] ? scsi_execute_req+0x58/0x83 [<c127c391>] ? scsi_probe_and_add_lun+0x188/0x7c2 [<c12718c6>] ? attribute_container_add_device+0x15/0xfa [<c11c95d1>] ? kobject_get+0xf/0x13 [<c126d1db>] ? get_device+0x10/0x14 [<c127be93>] ? scsi_alloc_target+0x217/0x24d [<c127cbd8>] ? __scsi_scan_target+0x95/0x480 [<c10204eb>] ? dequeue_entity+0x14/0x1fe [<c1020491>] ? update_curr+0x165/0x1ab [<c1020491>] ? update_curr+0x165/0x1ab [<c127d00d>] ? scsi_scan_channel+0x4a/0x76 [<c127d0b0>] ? scsi_scan_host_selected+0x77/0xad [<c127d13c>] ? do_scan_async+0x0/0x11a [<c127d137>] ? do_scsi_scan_host+0x51/0x56 [<c127d13c>] ? do_scan_async+0x0/0x11a [<c127d14a>] ? do_scan_async+0xe/0x11a [<c127d13c>] ? do_scan_async+0x0/0x11a [<c10354c5>] ? kthread+0x5e/0x63 [<c1035467>] ? kthread+0x0/0x63 [<c1002af6>] ? kernel_thread_helper+0x6/0x10 Code: 44 24 1c 54 83 44 24 18 54 83 fa 03 75 94 8b 06 c7 86 64 02 00 00 01 00 00 00 83 e0 03 09 f0 89 06 8b 44 24 28 8b 90 58 01 00 00 <8b> 42 2c 85 c0 75 03 8b 42 08 8d 54 24 48 52 8d 4c 24 50 51 68 EIP: [<c11c7b08>] cfq_get_queue+0x232/0x412 SS:ESP 0068:dff8fd00 CR2: 000000000000002c ---[ end trace 9a88306573f69b12 ]--- The problem here is that we don't have bdi->dev information available when thread does some IO. Hence when dev_name() tries to access bdi->dev, it crashes. This problem does not happen if kernel threads are in root group as root group is statically allocated at device initialization time and we don't hit this piece of code. Fix it by delaying the filling of major and minor number information of device in blk_group. Initially a blk_group is created with 0 as device information and this information is filled later once some more IO comes in from same group. Reported-by: Mike Kazantsev <mk.fraggod@gmail.com> Signed-off-by: Vivek Goyal <vgoyal@redhat.com> Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
2010-09-21block: fix blk_rq_map_kern bio direction flagBenny Halevy
This bug was introduced in 7b6d91daee5cac6402186ff224c3af39d79f4a0e "block: unify flags for struct bio and struct request" Cc: Boaz Harrosh <bharrosh@panasas.com> Signed-off-by: Benny Halevy <bhalevy@panasas.com> Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
2010-09-21cciss: freeing uninitialized data on error pathDan Carpenter
The "h->scatter_list" is allocated inside a for loop. If any of those allocations fail, then the rest of the list is uninitialized data. When we free it we should start from the top and free backwards so that we don't call kfree() on uninitialized pointers. Also if the allocation for "h->scatter_list" fails then we would get an Oops here. I should have noticed this when I send: 4ee69851c "cciss: handle allocation failure." but I didn't. Sorry about that. Signed-off-by: Dan Carpenter <error27@gmail.com> Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
2010-09-21Merge remote branch 'linus' into drm-intel-fixesChris Wilson
2010-09-20sparc64: Fix race in signal instruction flushing.David S. Miller
If another cpu does a very wide munmap() on the signal frame area, it can tear down the page table hierarchy from underneath us. Borrow an idea from the 64-bit fault path's get_user_insn(), and disable cross call interrupts during the page table traversal to lock them in place while we operate. Reported-by: Al Viro <viro@ZenIV.linux.org.uk> Signed-off-by: David S. Miller <davem@davemloft.net>
2010-09-21lguest: update comments to reflect LHCALL_LOAD_GDT_ENTRY.Rusty Russell
We used to have a hypercall which reloaded the entire GDT, then we switched to one which loaded a single entry (to match the IDT code). Some comments were not updated, so fix them. Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> Reported by: Eviatar Khen <eviatarkhen@gmail.com>
2010-09-21virtio: console: Prevent userspace from submitting NULL buffersAmit Shah
A userspace could submit a buffer with 0 length to be written to the host. Prevent such a situation. This was not needed previously, but recent changes in the way write() works exposed this condition to trigger a virtqueue event to the host, causing a NULL buffer to be sent across. Signed-off-by: Amit Shah <amit.shah@redhat.com> Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> CC: stable@kernel.org
2010-09-21virtio: console: Fix poll blocking even though there is data to readHans de Goede
I found this while working on a Linux agent for spice, the symptom I was seeing was select blocking on the spice vdagent virtio serial port even though there were messages queued up there. virtio_console's port_fops_poll checks port->inbuf != NULL to determine if read won't block. However if an application reads enough bytes from inbuf through port_fops_read, to empty the current port->inbuf, port->inbuf will be NULL even though there may be buffers left in the virtqueue. This causes poll() to block even though there is data to be read, this patch fixes this by using will_read_block(port) instead of the port->inbuf != NULL check. Signed-off-By: Hans de Goede <hdegoede@redhat.com> Signed-off-by: Amit Shah <amit.shah@redhat.com> Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> Cc: stable@kernel.org
2010-09-20Linux 2.6.36-rc5v2.6.36-rc5Linus Torvalds
2010-09-20Merge git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging-2.6Linus Torvalds
* git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging-2.6: Staging: vt6655: fix buffer overflow Revert: "Staging: batman-adv: Adding netfilter-bridge hooks"
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