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2008-01-28cfq-iosched: relax IOPRIO_CLASS_IDLE restrictionsJens Axboe1-83/+34
Currently you must be root to set idle io prio class on a process. This is due to the fact that the idle class is implemented as a true idle class, meaning that it will not make progress if someone else is requesting disk access. Unfortunately this means that it opens DOS opportunities by locking down file system resources, hence it is root only at the moment. This patch relaxes the idle class a little, by removing the truly idle part (which entals a grace period with associated timer). The modifications make the idle class as close to zero impact as can be done while still guarenteeing progress. This means we can relax the root only criteria as well. Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
2008-01-28io_context sharing - anticipatory changesJens Axboe1-6/+28
changes to anticipatory io scheduler for io_context sharing Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
2008-01-28block: cfq: make the io contect sharing locklessJens Axboe2-135/+181
The io context sharing introduced a per-ioc spinlock, that would protect the cfq io context lookup. That is a regression from the original, since we never needed any locking there because the ioc/cic were process private. The cic lookup is changed from an rbtree construct to a radix tree, which we can then use RCU to make the reader side lockless. That is the performance critical path, modifying the radix tree is only done on process creation (when that process first does IO, actually) and on process exit (if that process has done IO). As it so happens, radix trees are also much faster for this type of lookup where the key is a pointer. It's a very sparse tree. Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
2008-01-28io_context sharing - cfq changesNikanth Karthikesan1-2/+18
changes in the cfq for io_context sharing Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
2008-01-28io context sharing: preliminary supportJens Axboe1-16/+30
Detach task state from ioc, instead keep track of how many processes are accessing the ioc. Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
2008-01-28ioprio: move io priority from task_struct to io_contextJens Axboe2-27/+37
This is where it belongs and then it doesn't take up space for a process that doesn't do IO. Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
2008-01-25Merge git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi-misc-2.6Linus Torvalds2-2/+36
* git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi-misc-2.6: (200 commits) [SCSI] usbstorage: use last_sector_bug flag universally [SCSI] libsas: abstract STP task status into a function [SCSI] ultrastor: clean up inline asm warnings [SCSI] aic7xxx: fix firmware build [SCSI] aacraid: fib context lock for management ioctls [SCSI] ch: remove forward declarations [SCSI] ch: fix device minor number management bug [SCSI] ch: handle class_device_create failure properly [SCSI] NCR5380: fix section mismatch [SCSI] sg: fix /proc/scsi/sg/devices when no SCSI devices [SCSI] IB/iSER: add logical unit reset support [SCSI] don't use __GFP_DMA for sense buffers if not required [SCSI] use dynamically allocated sense buffer [SCSI] scsi.h: add macro for enclosure bit of inquiry data [SCSI] sd: add fix for devices with last sector access problems [SCSI] fix pcmcia compile problem [SCSI] aacraid: add Voodoo Lite class of cards. [SCSI] aacraid: add new driver features flags [SCSI] qla2xxx: Update version number to 8.02.00-k7. [SCSI] qla2xxx: Issue correct MBC_INITIALIZE_FIRMWARE command. ...
2008-01-24Kobject: rename kobject_init_ng() to kobject_init()Greg Kroah-Hartman2-2/+2
Now that the old kobject_init() function is gone, rename kobject_init_ng() to kobject_init() to clean up the namespace. Cc: Kay Sievers <kay.sievers@vrfy.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2008-01-24Kobject: rename kobject_add_ng() to kobject_add()Greg Kroah-Hartman2-3/+3
Now that the old kobject_add() function is gone, rename kobject_add_ng() to kobject_add() to clean up the namespace. Cc: Kay Sievers <kay.sievers@vrfy.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2008-01-24Kobject: convert block/ll_rw_blk.c to use kobject_init/add_ng()Greg Kroah-Hartman1-6/+3
This converts the code to use the new kobject functions, cleaning up the logic in doing so. Cc: Jens Axboe <axboe@kernel.dk> Cc: Kay Sievers <kay.sievers@vrfy.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2008-01-24Kobject: convert block/elevator.c to use kobject_init/add_ng()Greg Kroah-Hartman1-6/+2
This converts the code to use the new kobject functions, cleaning up the logic in doing so. Cc: Jens Axboe <axboe@kernel.dk> Cc: Kay Sievers <kay.sievers@vrfy.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2008-01-24Driver core: convert block from raw kobjects to core devicesKay Sievers2-235/+185
This moves the block devices to /sys/class/block. It will create a flat list of all block devices, with the disks and partitions in one directory. For compatibility /sys/block is created and contains symlinks to the disks. /sys/class/block |-- sda -> ../../devices/pci0000:00/0000:00:1f.2/host0/target0:0:0/0:0:0:0/block/sda |-- sda1 -> ../../devices/pci0000:00/0000:00:1f.2/host0/target0:0:0/0:0:0:0/block/sda/sda1 |-- sda10 -> ../../devices/pci0000:00/0000:00:1f.2/host0/target0:0:0/0:0:0:0/block/sda/sda10 |-- sda5 -> ../../devices/pci0000:00/0000:00:1f.2/host0/target0:0:0/0:0:0:0/block/sda/sda5 |-- sda6 -> ../../devices/pci0000:00/0000:00:1f.2/host0/target0:0:0/0:0:0:0/block/sda/sda6 |-- sda7 -> ../../devices/pci0000:00/0000:00:1f.2/host0/target0:0:0/0:0:0:0/block/sda/sda7 |-- sda8 -> ../../devices/pci0000:00/0000:00:1f.2/host0/target0:0:0/0:0:0:0/block/sda/sda8 |-- sda9 -> ../../devices/pci0000:00/0000:00:1f.2/host0/target0:0:0/0:0:0:0/block/sda/sda9 `-- sr0 -> ../../devices/pci0000:00/0000:00:1f.2/host1/target1:0:0/1:0:0:0/block/sr0 /sys/block/ |-- sda -> ../devices/pci0000:00/0000:00:1f.2/host0/target0:0:0/0:0:0:0/block/sda `-- sr0 -> ../devices/pci0000:00/0000:00:1f.2/host1/target1:0:0/1:0:0:0/block/sr0 Signed-off-by: Kay Sievers <kay.sievers@vrfy.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2008-01-24kset: convert block_subsys to use kset_createGreg Kroah-Hartman1-18/+16
Dynamically create the kset instead of declaring it statically. We also rename block_subsys to block_kset to catch all users of this symbol with a build error instead of an easy-to-ignore build warning. Cc: Kay Sievers <kay.sievers@vrfy.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2008-01-24kobject: remove struct kobj_type from struct ksetGreg Kroah-Hartman1-2/+3
We don't need a "default" ktype for a kset. We should set this explicitly every time for each kset. This change is needed so that we can make ksets dynamic, and cleans up one of the odd, undocumented assumption that the kset/kobject/ktype model has. This patch is based on a lot of help from Kay Sievers. Nasty bug in the block code was found by Dave Young <hidave.darkstar@gmail.com> Cc: Kay Sievers <kay.sievers@vrfy.org> Cc: Dave Young <hidave.darkstar@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2008-01-11[SCSI] block: Introduce new blk_queue_update_dma_alignment interfaceJames Bottomley1-0/+24
The purpose of this is to allow stacked alignment settings, with the ultimate queue alignment being set to the largest alignment requirement in the stack. The reason for this is so that the SCSI mid-layer can relax the default alignment requirements (which are basically causing a lot of superfluous copying to go on in the SG_IO interface) while allowing transports, devices or HBAs to add stricter limits if they need them. Acked-by: Jens Axboe <jens.axboe@oracle.com> Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
2008-01-11[SCSI] libsas, bsg: pass errors through correctlyJames Bottomley1-2/+12
Currently in BSG, errors returned in req->errors aren't passed back to the calling programme (either via SG_IO or via read/write). Fix this, while preserving the SCSI convention of returning status in req->errors. Now update libsas to return errors correctly instead of to ignore them. Acked-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
2008-01-11blktrace: kill the unneeded initcallJens Axboe1-11/+1
It just inits the mutex, we can do that with DEFINE_MUTEX() instead. Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
2008-01-11block: fix blktrace timestampsIngo Molnar1-67/+2
David Dillow reported broken blktrace timestamps. The reason is cpu_clock() which is not a global time source. Fix bkltrace timestamps by using ktime_get() like the networking code does for packet timestamps. This also removes a whole lot of complexity from bkltrace.c and shrinks the code by 500 bytes: text data bss dec hex filename 2888 124 44 3056 bf0 blktrace.o.before 2390 116 44 2550 9f6 blktrace.o.after Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
2007-12-18block: let elv_register() return voidAdrian Bunk5-11/+12
elv_register() always returns 0, and there isn't anything it does where it should return an error (the only error condition is so grave that it's handled with a BUG_ON). Signed-off-by: Adrian Bunk <bunk@kernel.org> Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
2007-12-18as-iosched: fix write batch start pointAaron Carroll1-1/+2
New write batches currently start from where the last one completed. We have no idea where the head is after switching batches, so this makes little sense. Instead, start the next batch from the request with the earliest deadline in the hope that we avoid a deadline expiry later on. Signed-off-by: Aaron Carroll <aaronc@gelato.unsw.edu.au> Acked-by: Nick Piggin <npiggin@suse.de> Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
2007-12-18as-iosched: fix incorrect commentsAaron Carroll1-2/+2
Two comments refer to deadlines applying to reads only. This is not the case. Signed-off-by: Aaron Carroll <aaronc@gelato.unsw.edu.au> Acked-by: Nick Piggin <npiggin@suse.de> Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
2007-12-18block: use jiffies conversion functions in scsi_ioctl.cTejun Heo1-2/+2
Use msecs_to_jiffies() and jiffies_to_msecs() in scsi_ioctl(). Sometimes callers use very large values for e.g. vendor specific media clear command and calculation can overflow. Signed-off-by: Tejun Heo <htejun@gmail.com> Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
2007-11-27Revert "ll_rw_blk: temporarily enable max_segments tweaking"Jens Axboe1-23/+0
This was a temporary debugging thing for sg chaining testing, revert it now as it has served its purpose. This reverts commit 563063a808de6b2004d5b8a09ddcb6125481f4b2. Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
2007-11-27block: Fix memory leak in alloc_disk_node()Jerome Marchand1-0/+1
Fix a memory leak in alloc_disk_node(). Don't forget to free 'dkstats' when the allocation of 'part' failed. Signed-off-by: Jerome Marchand <jmarchan@redhat.com> Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
2007-11-27blktrace: Make sure BLKTRACETEARDOWN does the full cleanup.Aneesh Kumar K.V1-2/+7
if blktrace program segfault it will not be able to call BLKTRACETEARDOWN. Now if we run the blktrace again that would result in a failure to create the block/<device> debugfs directory.This will result in blk_remove_root() to be called which will set blk_tree_root to NULL. But the debugfs block dir still exist because it contain subdirectory. Now if we try to fix it using BLKTRACETEARDOWN it won't work because blk_tree_root is NULL. Fix the same. Tested as below root@qemu-image:/home/kvaneesh/blktrace# ./blktrace -d /dev/hdc Segmentation fault root@qemu-image:/home/kvaneesh/blktrace# ./blktrace -d /dev/hdc BLKTRACESETUP: No such file or directory Failed to start trace on /dev/hdc root@qemu-image:/home/kvaneesh/blktrace# ./blktrace -k /dev/hdc root@qemu-image:/home/kvaneesh/blktrace# ./blktrace -d /dev/hdc Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
2007-11-09Add UNPLUG traces to all appropriate placesAlan D. Brunelle1-9/+15
Added blk_unplug interface, allowing all invocations of unplugs to result in a generated blktrace UNPLUG. Signed-off-by: Alan D. Brunelle <Alan.Brunelle@hp.com> Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
2007-11-09block: fix requeue handling in blk_queue_invalidate_tags()Jens Axboe1-15/+2
Credit goes to juergen.kadidlo@exasol.com for diagnosing this issue and supplying the initial patch. blk_queue_invalidate_tags() must use the proper requeueing paths instead of open coding the re-add of the request, otherwise we bug out in rq accounting. Just switch to using blk_requeue_request(), that takes care of end-tag handling as well and also adds the blktrace REQUEUE notify event that is also appropriate here. Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
2007-11-07cfq_idle_class_timer: add paranoid checks for jiffies overflowOleg Nesterov1-11/+17
In theory, if the queue was idle long enough, cfq_idle_class_timer may have a false (and very long) timeout because jiffies can wrap into the past wrt ->last_end_request. Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru> Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
2007-11-07cfq: fix IOPRIO_CLASS_IDLE delaysOleg Nesterov1-0/+1
After the fresh boot: ionice -c3 -p $$ echo cfq >> /sys/block/XXX/queue/scheduler dd if=/dev/XXX of=/dev/null bs=512 count=1 Now dd hangs in D state and the queue is completely stalled for approximately INITIAL_JIFFIES + CFQ_IDLE_GRACE jiffies. This is because cfq_init_queue() forgets to initialize cfq_data->last_end_request. (I guess this patch is not complete, overflow is still possible) Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru> Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
2007-11-07cfq: fix IOPRIO_CLASS_IDLE accountingOleg Nesterov1-2/+3
Spotted by Nick <gentuu@gmail.com>, hopefully can explain the second trace in http://bugzilla.kernel.org/show_bug.cgi?id=9180. If ->async_idle_cfqq != NULL cfq_put_async_queues() puts it IOPRIO_BE_NR times in a loop. Fix this. Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru> Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
2007-11-03Merge branch 'for-linus' of git://git.kernel.dk/linux-2.6-blockLinus Torvalds2-28/+32
* 'for-linus' of git://git.kernel.dk/linux-2.6-block: [BLOCK] Don't allow empty barriers to be passed down to queues that don't grok them dm: bounce_pfn limit added Deadline iosched: Fix batching fairness Deadline iosched: Reset batch for ordered requests Deadline iosched: Factor out finding latter reques
2007-11-02[BLOCK] Don't allow empty barriers to be passed down to queues that don't ↵Jens Axboe1-1/+6
grok them Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
2007-11-02Deadline iosched: Fix batching fairnessAaron Carroll1-14/+7
After switching data directions, deadline always starts the next batch from the lowest-sector request. This gives excessive deadline expiries and large latency and throughput disparity between high- and low-sector requests; an order of magnitude in some tests. This patch changes the batching behaviour so new batches start from the request whose expiry is earliest. Signed-off-by: Aaron Carroll <aaronc@gelato.unsw.edu.au> Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
2007-11-02Deadline iosched: Reset batch for ordered requestsAaron Carroll1-3/+3
The deadline I/O scheduler does not reset the batch count when starting a new batch at a higher-sectored request. This means the second and subsequent batch in the same data direction will never exceed a single request in size whenever higher-sectored requests are pending. This patch gives new batches in the same data direction as old ones their full quota of requests by resetting the batch count. Signed-off-by: Aaron Carroll <aaronc@gelato.unsw.edu.au> Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
2007-11-02Deadline iosched: Factor out finding latter requesAaron Carroll1-11/+17
Factor finding the next request in sector-sorted order into a function deadline_latter_request. Signed-off-by: Aaron Carroll <aaronc@gelato.unsw.edu.au> Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
2007-11-02[SG] Get rid of __sg_mark_end()Jens Axboe1-1/+1
sg_mark_end() overwrites the page_link information, but all users want __sg_mark_end() behaviour where we just set the end bit. That is the most natural way to use the sg list, since you'll fill it in and then mark the end point. So change sg_mark_end() to only set the termination bit. Add a sg_magic debug check as well, and clear a chain pointer if it is set. Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
2007-10-29compat_ioctl: fix block device compat ioctl regressionPhilip Langdale1-1/+1
The conversion of handlers to compat_blkdev_ioctl accidentally disabled handling of most ioctl numbers on block devices because of a typo. Fix the one line to enable it all again. Signed-off-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Jens Axboe <axboe@carl.home.kernel.dk>
2007-10-29[BLOCK] Fix bad sharing of tag busy list on queues with shared tag mapsJens Axboe1-5/+3
For the locking to work, only the tag map and tag bit map may be shared (incidentally, I was just explaining this to Nick yesterday, but I apparently didn't review the code well enough myself). But we also share the busy list! The busy_list must be queue private, or we need a block_queue_tag covering lock as well. So we have to move the busy_list to the queue. This'll work fine, and it'll actually also fix a problem with blk_queue_invalidate_tags() which will invalidate tags across all shared queues. This is a bit confusing, the low level driver should call it for each queue seperately since otherwise you cannot kill tags on just a single queue for eg a hard drive that stops responding. Since the function has no callers currently, it's not an issue. Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
2007-10-29block: use lock bitops for the tag map.Nick Piggin1-11/+9
The block queue tag map can use lock bitops. Signed-off-by: Nick Piggin <npiggin@suse.de> Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
2007-10-29cfq_get_queue: fix possible NULL pointer accessOleg Nesterov1-1/+4
cfq_get_queue()->cfq_find_alloc_queue() can fail, check the returned value. Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru> Note that this isn't a bug at the moment, since the regular IO path does not call this path without __GFP_WAIT set. However, it could be a future bug, so I've applied it. Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
2007-10-29blk_sync_queue() should cancel request_queue->unplug_workOleg Nesterov1-0/+1
blk_sync_queue() cancels the timer, but forgets to cancel the work. Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru> Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
2007-10-29cfq_exit_queue() should cancel cfq_data->unplug_workOleg Nesterov1-1/+1
Spotted by Nick <gentuu@gmail.com>, perhaps explains the first trace in http://bugzilla.kernel.org/show_bug.cgi?id=9180. cfq_exit_queue() should cancel cfqd->unplug_work before freeing cfqd. blk_sync_queue() seems unneeded, removed. Q: why cfq_exit_queue() calls cfq_shutdown_timer_wq() twice? Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru> Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
2007-10-29block layer: remove a unused argument of drive_stat_acct()Jerome Marchand1-6/+6
The nr_sector argument of drive_stat_acct() is not used anymore since the read and write sectors statistics are now updated in end_that_request_first(). This patch removes the useless argument. Signed-off-by: Jerome Marchand <jmarchan@redhat.com> Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
2007-10-24SG: Change sg_set_page() to take length and offset argumentJens Axboe1-3/+1
Most drivers need to set length and offset as well, so may as well fold those three lines into one. Add sg_assign_page() for those two locations that only needed to set the page, where the offset/length is set outside of the function context. Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
2007-10-23[BLOCK] blk_rq_map_sg: force clear termination bitJens Axboe1-1/+13
Since blk_rq_map_sg() sets the termination bit at the end of the sg table, we could see it prematurely on the next mapping unless we force drivers to do a full sg_init_table() prior to each mapping. So force clear the termination bit to avoid having to put that clear in the driver for every mapping. Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
2007-10-23[BLOCK] Don't clear sg_dma_len/addr() in blk_rq_map_sg()Jens Axboe1-2/+0
It's not a proper lvalue on all archs. Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
2007-10-22[SG] Update block layer to use sg helpersJens Axboe1-2/+6
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
2007-10-20fix typo "insted" -> "instead"Uwe Kleine-König1-1/+1
Signed-off-by: Uwe Kleine-König <ukleinek@informatik.uni-freiburg.de> Signed-off-by: Adrian Bunk <bunk@kernel.org>
2007-10-19Use helpers to obtain task pid in printksPavel Emelyanov1-1/+1
The task_struct->pid member is going to be deprecated, so start using the helpers (task_pid_nr/task_pid_vnr/task_pid_nr_ns) in the kernel. The first thing to start with is the pid, printed to dmesg - in this case we may safely use task_pid_nr(). Besides, printks produce more (much more) than a half of all the explicit pid usage. [akpm@linux-foundation.org: git-drm went and changed lots of stuff] Signed-off-by: Pavel Emelyanov <xemul@openvz.org> Cc: Dave Airlie <airlied@linux.ie> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-10-19kernel-api docbook: fix content problemsRandy Dunlap1-1/+1
Fix kernel-api docbook contents problems. docproc: linux-2.6.23-git13/include/asm-x86/unaligned_32.h: No such file or directory Warning(linux-2.6.23-git13//include/linux/list.h:482): bad line: of list entry Warning(linux-2.6.23-git13//mm/filemap.c:864): No description found for parameter 'ra' Warning(linux-2.6.23-git13//block/ll_rw_blk.c:3760): No description found for parameter 'req' Warning(linux-2.6.23-git13//include/linux/input.h:1077): No description found for parameter 'private' Warning(linux-2.6.23-git13//include/linux/input.h:1077): No description found for parameter 'cdev' Signed-off-by: Randy Dunlap <randy.dunlap@oracle.com> Cc: Jens Axboe <jens.axboe@oracle.com> Cc: WU Fengguang <wfg@mail.ustc.edu.cn> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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