1. 13 Oct, 2016 25 commits
  2. 12 Oct, 2016 3 commits
    • Geert Uytterhoeven's avatar
      strparser: Propagate correct error code in strp_recv() · 6d3a4c40
      Geert Uytterhoeven authored
      With m68k-linux-gnu-gcc-4.1:
      
          net/strparser/strparser.c: In function ‘strp_recv’:
          net/strparser/strparser.c:98: warning: ‘err’ may be used uninitialized in this function
      
      Pass "len" (which is an error code when negative) instead of the
      uninitialized "err" variable to fix this.
      
      Fixes: 43a0c675 ("strparser: Stream parser for messages")
      Signed-off-by: default avatarGeert Uytterhoeven <geert@linux-m68k.org>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      6d3a4c40
    • Linus Torvalds's avatar
      Merge tag 'drm-for-v4.9' of git://people.freedesktop.org/~airlied/linux · 6b25e21f
      Linus Torvalds authored
      Pull drm updates from Dave Airlie:
       "Core:
         - Fence destaging work
         - DRIVER_LEGACY to split off legacy drm drivers
         - drm_mm refactoring
         - Splitting drm_crtc.c into chunks and documenting better
         - Display info fixes
         - rbtree support for prime buffer lookup
         - Simple VGA DAC driver
      
        Panel:
         - Add Nexus 7 panel
         - More simple panels
      
        i915:
         - Refactoring GEM naming
         - Refactored vma/active tracking
         - Lockless request lookups
         - Better stolen memory support
         - FBC fixes
         - SKL watermark fixes
         - VGPU improvements
         - dma-buf fencing support
         - Better DP dongle support
      
        amdgpu:
         - Powerplay for Iceland asics
         - Improved GPU reset support
         - UVD/VEC powergating support for CZ/ST
         - Preinitialised VRAM buffer support
         - Virtual display support
         - Initial SI support
         - GTT rework
         - PCI shutdown callback support
         - HPD IRQ storm fixes
      
        amdkfd:
         - bugfixes
      
        tilcdc:
         - Atomic modesetting support
      
        mediatek:
         - AAL + GAMMA engine support
         - Hook up gamma LUT
         - Temporal dithering support
      
        imx:
         - Pixel clock from devicetree
         - drm bridge support for LVDS bridges
         - active plane reconfiguration
         - VDIC deinterlacer support
         - Frame synchronisation unit support
         - Color space conversion support
      
        analogix:
         - PSR support
         - Better panel on/off support
      
        rockchip:
         - rk3399 vop/crtc support
         - PSR support
      
        vc4:
         - Interlaced vblank timing
         - 3D rendering CPU overhead reduction
         - HDMI output fixes
      
        tda998x:
         - HDMI audio ASoC support
      
        sunxi:
         - Allwinner A33 support
         - better TCON support
      
        msm:
         - DT binding cleanups
         - Explicit fence-fd support
      
        sti:
         - remove sti415/416 support
      
        etnaviv:
         - MMUv2 refactoring
         - GC3000 support
      
        exynos:
         - Refactoring HDMI DCC/PHY
         - G2D pm regression fix
         - Page fault issues with wait for vblank
      
        There is no nouveau work in this tree, as Ben didn't get a pull
        request in, and he was fighting moving to atomic and adding mst
        support, so maybe best it waits for a cycle"
      
      * tag 'drm-for-v4.9' of git://people.freedesktop.org/~airlied/linux: (1412 commits)
        drm/crtc: constify drm_crtc_index parameter
        drm/i915: Fix conflict resolution from backmerge of v4.8-rc8 to drm-next
        drm/i915/guc: Unwind GuC workqueue reservation if request construction fails
        drm/i915: Reset the breadcrumbs IRQ more carefully
        drm/i915: Force relocations via cpu if we run out of idle aperture
        drm/i915: Distinguish last emitted request from last submitted request
        drm/i915: Allow DP to work w/o EDID
        drm/i915: Move long hpd handling into the hotplug work
        drm/i915/execlists: Reinitialise context image after GPU hang
        drm/i915: Use correct index for backtracking HUNG semaphores
        drm/i915: Unalias obj->phys_handle and obj->userptr
        drm/i915: Just clear the mmiodebug before a register access
        drm/i915/gen9: only add the planes actually affected by ddb changes
        drm/i915: Allow PCH DPLL sharing regardless of DPLL_SDVO_HIGH_SPEED
        drm/i915/bxt: Fix HDMI DPLL configuration
        drm/i915/gen9: fix the watermark res_blocks value
        drm/i915/gen9: fix plane_blocks_per_line on watermarks calculations
        drm/i915/gen9: minimum scanlines for Y tile is not always 4
        drm/i915/gen9: fix the WaWmMemoryReadLatency implementation
        drm/i915/kbl: KBL also needs to run the SAGV code
        ...
      6b25e21f
    • Linus Torvalds's avatar
      Merge branch 'akpm' (patches from Andrew) · a379f71a
      Linus Torvalds authored
      Merge more updates from Andrew Morton:
      
       - a few block updates that fell in my lap
      
       - lib/ updates
      
       - checkpatch
      
       - autofs
      
       - ipc
      
       - a ton of misc other things
      
      * emailed patches from Andrew Morton <akpm@linux-foundation.org>: (100 commits)
        mm: split gfp_mask and mapping flags into separate fields
        fs: use mapping_set_error instead of opencoded set_bit
        treewide: remove redundant #include <linux/kconfig.h>
        hung_task: allow hung_task_panic when hung_task_warnings is 0
        kthread: add kerneldoc for kthread_create()
        kthread: better support freezable kthread workers
        kthread: allow to modify delayed kthread work
        kthread: allow to cancel kthread work
        kthread: initial support for delayed kthread work
        kthread: detect when a kthread work is used by more workers
        kthread: add kthread_destroy_worker()
        kthread: add kthread_create_worker*()
        kthread: allow to call __kthread_create_on_node() with va_list args
        kthread/smpboot: do not park in kthread_create_on_cpu()
        kthread: kthread worker API cleanup
        kthread: rename probe_kthread_data() to kthread_probe_data()
        scripts/tags.sh: enable code completion in VIM
        mm: kmemleak: avoid using __va() on addresses that don't have a lowmem mapping
        kdump, vmcoreinfo: report memory sections virtual addresses
        ipc/sem.c: add cond_resched in exit_sme
        ...
      a379f71a
  3. 11 Oct, 2016 12 commits
    • Michal Hocko's avatar
      mm: split gfp_mask and mapping flags into separate fields · 9c5d760b
      Michal Hocko authored
      mapping->flags currently encodes two different things into a single flag.
      It contains sticky gfp_mask for page cache allocations and AS_ codes used
      to report errors/enospace and other states which are mapping specific.
      Condensing the two semantically unrelated things saves few bytes but it
      also complicates other things.  For one thing the gfp flags space is
      reduced and in fact we are already running out of available bits.  It can
      be assumed that more gfp flags will be necessary later on.
      
      To not introduce the address_space grow (at least on x86_64) we can stick
      it right after private_lock because we have a hole there.
      
      struct address_space {
              struct inode *             host;                 /*     0     8 */
              struct radix_tree_root     page_tree;            /*     8    16 */
              spinlock_t                 tree_lock;            /*    24     4 */
              atomic_t                   i_mmap_writable;      /*    28     4 */
              struct rb_root             i_mmap;               /*    32     8 */
              struct rw_semaphore        i_mmap_rwsem;         /*    40    40 */
              /* --- cacheline 1 boundary (64 bytes) was 16 bytes ago --- */
              long unsigned int          nrpages;              /*    80     8 */
              long unsigned int          nrexceptional;        /*    88     8 */
              long unsigned int          writeback_index;      /*    96     8 */
              const struct address_space_operations  * a_ops;  /*   104     8 */
              long unsigned int          flags;                /*   112     8 */
              spinlock_t                 private_lock;         /*   120     4 */
      
              /* XXX 4 bytes hole, try to pack */
      
              /* --- cacheline 2 boundary (128 bytes) --- */
              struct list_head           private_list;         /*   128    16 */
              void *                     private_data;         /*   144     8 */
      
              /* size: 152, cachelines: 3, members: 14 */
              /* sum members: 148, holes: 1, sum holes: 4 */
              /* last cacheline: 24 bytes */
      };
      
      Link: http://lkml.kernel.org/r/20160912114852.GI14524@dhcp22.suse.czSigned-off-by: default avatarMichal Hocko <mhocko@suse.com>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      9c5d760b
    • Michal Hocko's avatar
      fs: use mapping_set_error instead of opencoded set_bit · 5114a97a
      Michal Hocko authored
      The mapping_set_error() helper sets the correct AS_ flag for the mapping
      so there is no reason to open code it.  Use the helper directly.
      
      [akpm@linux-foundation.org: be honest about conversion from -ENXIO to -EIO]
      Link: http://lkml.kernel.org/r/20160912111608.2588-2-mhocko@kernel.orgSigned-off-by: default avatarMichal Hocko <mhocko@suse.com>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      5114a97a
    • Masahiro Yamada's avatar
      treewide: remove redundant #include <linux/kconfig.h> · 97139d4a
      Masahiro Yamada authored
      Kernel source files need not include <linux/kconfig.h> explicitly
      because the top Makefile forces to include it with:
      
        -include $(srctree)/include/linux/kconfig.h
      
      This commit removes explicit includes except the following:
      
        * arch/s390/include/asm/facilities_src.h
        * tools/testing/radix-tree/linux/kernel.h
      
      These two are used for host programs.
      
      Link: http://lkml.kernel.org/r/1473656164-11929-1-git-send-email-yamada.masahiro@socionext.comSigned-off-by: default avatarMasahiro Yamada <yamada.masahiro@socionext.com>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      97139d4a
    • John Siddle's avatar
      hung_task: allow hung_task_panic when hung_task_warnings is 0 · 48a6d64e
      John Siddle authored
      Previously hung_task_panic would not be respected if enabled after
      hung_task_warnings had already been decremented to 0.
      
      Permit the kernel to panic if hung_task_panic is enabled after
      hung_task_warnings has already been decremented to 0 and another task
      hangs for hung_task_timeout_secs seconds.
      
      Check if hung_task_panic is enabled so we don't return prematurely, and
      check if hung_task_warnings is non-zero so we don't print the warning
      unnecessarily.
      
      [akpm@linux-foundation.org: fix off-by-one]
      Link: http://lkml.kernel.org/r/1473450214-4049-1-git-send-email-jsiddle@redhat.comSigned-off-by: default avatarJohn Siddle <jsiddle@redhat.com>
      Cc: Tetsuo Handa <penguin-kernel@i-love.sakura.ne.jp>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      48a6d64e
    • Jonathan Corbet's avatar
      kthread: add kerneldoc for kthread_create() · e154ccc8
      Jonathan Corbet authored
      This macro is referenced in other kerneldoc comments, but lacks one of its
      own; fix that.
      
      Link: http://lkml.kernel.org/r/20160826072313.726a3485@lwn.netSigned-off-by: default avatarJonathan Corbet <corbet@lwn.net>
      Reported-by: default avatarMauro Carvalho Chehab <mchehab@s-opensource.com>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      e154ccc8
    • Petr Mladek's avatar
      kthread: better support freezable kthread workers · dbf52682
      Petr Mladek authored
      This patch allows to make kthread worker freezable via a new @flags
      parameter. It will allow to avoid an init work in some kthreads.
      
      It currently does not affect the function of kthread_worker_fn()
      but it might help to do some optimization or fixes eventually.
      
      I currently do not know about any other use for the @flags
      parameter but I believe that we will want more flags
      in the future.
      
      Finally, I hope that it will not cause confusion with @flags member
      in struct kthread. Well, I guess that we will want to rework the
      basic kthreads implementation once all kthreads are converted into
      kthread workers or workqueues. It is possible that we will merge
      the two structures.
      
      Link: http://lkml.kernel.org/r/1470754545-17632-12-git-send-email-pmladek@suse.comSigned-off-by: default avatarPetr Mladek <pmladek@suse.com>
      Acked-by: default avatarTejun Heo <tj@kernel.org>
      Cc: Oleg Nesterov <oleg@redhat.com>
      Cc: Ingo Molnar <mingo@redhat.com>
      Cc: Peter Zijlstra <peterz@infradead.org>
      Cc: Steven Rostedt <rostedt@goodmis.org>
      Cc: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
      Cc: Josh Triplett <josh@joshtriplett.org>
      Cc: Thomas Gleixner <tglx@linutronix.de>
      Cc: Jiri Kosina <jkosina@suse.cz>
      Cc: Borislav Petkov <bp@suse.de>
      Cc: Michal Hocko <mhocko@suse.cz>
      Cc: Vlastimil Babka <vbabka@suse.cz>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      dbf52682
    • Petr Mladek's avatar
      kthread: allow to modify delayed kthread work · 9a6b06c8
      Petr Mladek authored
      There are situations when we need to modify the delay of a delayed kthread
      work. For example, when the work depends on an event and the initial delay
      means a timeout. Then we want to queue the work immediately when the event
      happens.
      
      This patch implements kthread_mod_delayed_work() as inspired workqueues.
      It cancels the timer, removes the work from any worker list and queues it
      again with the given timeout.
      
      A very special case is when the work is being canceled at the same time.
      It might happen because of the regular kthread_cancel_delayed_work_sync()
      or by another kthread_mod_delayed_work(). In this case, we do nothing and
      let the other operation win. This should not normally happen as the caller
      is supposed to synchronize these operations a reasonable way.
      
      Link: http://lkml.kernel.org/r/1470754545-17632-11-git-send-email-pmladek@suse.comSigned-off-by: default avatarPetr Mladek <pmladek@suse.com>
      Acked-by: default avatarTejun Heo <tj@kernel.org>
      Cc: Oleg Nesterov <oleg@redhat.com>
      Cc: Ingo Molnar <mingo@redhat.com>
      Cc: Peter Zijlstra <peterz@infradead.org>
      Cc: Steven Rostedt <rostedt@goodmis.org>
      Cc: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
      Cc: Josh Triplett <josh@joshtriplett.org>
      Cc: Thomas Gleixner <tglx@linutronix.de>
      Cc: Jiri Kosina <jkosina@suse.cz>
      Cc: Borislav Petkov <bp@suse.de>
      Cc: Michal Hocko <mhocko@suse.cz>
      Cc: Vlastimil Babka <vbabka@suse.cz>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      9a6b06c8
    • Petr Mladek's avatar
      kthread: allow to cancel kthread work · 37be45d4
      Petr Mladek authored
      We are going to use kthread workers more widely and sometimes we will need
      to make sure that the work is neither pending nor running.
      
      This patch implements cancel_*_sync() operations as inspired by
      workqueues.  Well, we are synchronized against the other operations via
      the worker lock, we use del_timer_sync() and a counter to count parallel
      cancel operations.  Therefore the implementation might be easier.
      
      First, we check if a worker is assigned.  If not, the work has newer been
      queued after it was initialized.
      
      Second, we take the worker lock.  It must be the right one.  The work must
      not be assigned to another worker unless it is initialized in between.
      
      Third, we try to cancel the timer when it exists.  The timer is deleted
      synchronously to make sure that the timer call back is not running.  We
      need to temporary release the worker->lock to avoid a possible deadlock
      with the callback.  In the meantime, we set work->canceling counter to
      avoid any queuing.
      
      Fourth, we try to remove the work from a worker list. It might be
      the list of either normal or delayed works.
      
      Fifth, if the work is running, we call kthread_flush_work().  It might
      take an arbitrary time.  We need to release the worker-lock again.  In the
      meantime, we again block any queuing by the canceling counter.
      
      As already mentioned, the check for a pending kthread work is done under a
      lock.  In compare with workqueues, we do not need to fight for a single
      PENDING bit to block other operations.  Therefore we do not suffer from
      the thundering storm problem and all parallel canceling jobs might use
      kthread_flush_work().  Any queuing is blocked until the counter gets zero.
      
      Link: http://lkml.kernel.org/r/1470754545-17632-10-git-send-email-pmladek@suse.comSigned-off-by: default avatarPetr Mladek <pmladek@suse.com>
      Acked-by: default avatarTejun Heo <tj@kernel.org>
      Cc: Oleg Nesterov <oleg@redhat.com>
      Cc: Ingo Molnar <mingo@redhat.com>
      Cc: Peter Zijlstra <peterz@infradead.org>
      Cc: Steven Rostedt <rostedt@goodmis.org>
      Cc: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
      Cc: Josh Triplett <josh@joshtriplett.org>
      Cc: Thomas Gleixner <tglx@linutronix.de>
      Cc: Jiri Kosina <jkosina@suse.cz>
      Cc: Borislav Petkov <bp@suse.de>
      Cc: Michal Hocko <mhocko@suse.cz>
      Cc: Vlastimil Babka <vbabka@suse.cz>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      37be45d4
    • Petr Mladek's avatar
      kthread: initial support for delayed kthread work · 22597dc3
      Petr Mladek authored
      We are going to use kthread_worker more widely and delayed works
      will be pretty useful.
      
      The implementation is inspired by workqueues.  It uses a timer to queue
      the work after the requested delay.  If the delay is zero, the work is
      queued immediately.
      
      In compare with workqueues, each work is associated with a single worker
      (kthread).  Therefore the implementation could be much easier.  In
      particular, we use the worker->lock to synchronize all the operations with
      the work.  We do not need any atomic operation with a flags variable.
      
      In fact, we do not need any state variable at all.  Instead, we add a list
      of delayed works into the worker.  Then the pending work is listed either
      in the list of queued or delayed works.  And the existing check of pending
      works is the same even for the delayed ones.
      
      A work must not be assigned to another worker unless reinitialized.
      Therefore the timer handler might expect that dwork->work->worker is valid
      and it could simply take the lock.  We just add some sanity checks to help
      with debugging a potential misuse.
      
      Link: http://lkml.kernel.org/r/1470754545-17632-9-git-send-email-pmladek@suse.comSigned-off-by: default avatarPetr Mladek <pmladek@suse.com>
      Acked-by: default avatarTejun Heo <tj@kernel.org>
      Cc: Oleg Nesterov <oleg@redhat.com>
      Cc: Ingo Molnar <mingo@redhat.com>
      Cc: Peter Zijlstra <peterz@infradead.org>
      Cc: Steven Rostedt <rostedt@goodmis.org>
      Cc: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
      Cc: Josh Triplett <josh@joshtriplett.org>
      Cc: Thomas Gleixner <tglx@linutronix.de>
      Cc: Jiri Kosina <jkosina@suse.cz>
      Cc: Borislav Petkov <bp@suse.de>
      Cc: Michal Hocko <mhocko@suse.cz>
      Cc: Vlastimil Babka <vbabka@suse.cz>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      22597dc3
    • Petr Mladek's avatar
      kthread: detect when a kthread work is used by more workers · 8197b3d4
      Petr Mladek authored
      Nothing currently prevents a work from queuing for a kthread worker when
      it is already running on another one.  This means that the work might run
      in parallel on more than one worker.  Also some operations are not
      reliable, e.g.  flush.
      
      This problem will be even more visible after we add kthread_cancel_work()
      function.  It will only have "work" as the parameter and will use
      worker->lock to synchronize with others.
      
      Well, normally this is not a problem because the API users are sane.
      But bugs might happen and users also might be crazy.
      
      This patch adds a warning when we try to insert the work for another
      worker.  It does not fully prevent the misuse because it would make the
      code much more complicated without a big benefit.
      
      It adds the same warning also into kthread_flush_work() instead of the
      repeated attempts to get the right lock.
      
      A side effect is that one needs to explicitly reinitialize the work if it
      must be queued into another worker.  This is needed, for example, when the
      worker is stopped and started again.  It is a bit inconvenient.  But it
      looks like a good compromise between the stability and complexity.
      
      I have double checked all existing users of the kthread worker API and
      they all seems to initialize the work after the worker gets started.
      
      Just for completeness, the patch adds a check that the work is not already
      in a queue.
      
      The patch also puts all the checks into a separate function.  It will be
      reused when implementing delayed works.
      
      Link: http://lkml.kernel.org/r/1470754545-17632-8-git-send-email-pmladek@suse.comSigned-off-by: default avatarPetr Mladek <pmladek@suse.com>
      Cc: Oleg Nesterov <oleg@redhat.com>
      Cc: Tejun Heo <tj@kernel.org>
      Cc: Ingo Molnar <mingo@redhat.com>
      Cc: Peter Zijlstra <peterz@infradead.org>
      Cc: Steven Rostedt <rostedt@goodmis.org>
      Cc: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
      Cc: Josh Triplett <josh@joshtriplett.org>
      Cc: Thomas Gleixner <tglx@linutronix.de>
      Cc: Jiri Kosina <jkosina@suse.cz>
      Cc: Borislav Petkov <bp@suse.de>
      Cc: Michal Hocko <mhocko@suse.cz>
      Cc: Vlastimil Babka <vbabka@suse.cz>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      8197b3d4
    • Petr Mladek's avatar
      kthread: add kthread_destroy_worker() · 35033fe9
      Petr Mladek authored
      The current kthread worker users call flush() and stop() explicitly.
      This function does the same plus it frees the kthread_worker struct
      in one call.
      
      It is supposed to be used together with kthread_create_worker*() that
      allocates struct kthread_worker.
      
      Link: http://lkml.kernel.org/r/1470754545-17632-7-git-send-email-pmladek@suse.comSigned-off-by: default avatarPetr Mladek <pmladek@suse.com>
      Cc: Oleg Nesterov <oleg@redhat.com>
      Cc: Tejun Heo <tj@kernel.org>
      Cc: Ingo Molnar <mingo@redhat.com>
      Cc: Peter Zijlstra <peterz@infradead.org>
      Cc: Steven Rostedt <rostedt@goodmis.org>
      Cc: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
      Cc: Josh Triplett <josh@joshtriplett.org>
      Cc: Thomas Gleixner <tglx@linutronix.de>
      Cc: Jiri Kosina <jkosina@suse.cz>
      Cc: Borislav Petkov <bp@suse.de>
      Cc: Michal Hocko <mhocko@suse.cz>
      Cc: Vlastimil Babka <vbabka@suse.cz>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      35033fe9
    • Petr Mladek's avatar
      kthread: add kthread_create_worker*() · fbae2d44
      Petr Mladek authored
      Kthread workers are currently created using the classic kthread API,
      namely kthread_run().  kthread_worker_fn() is passed as the @threadfn
      parameter.
      
      This patch defines kthread_create_worker() and
      kthread_create_worker_on_cpu() functions that hide implementation details.
      
      They enforce using kthread_worker_fn() for the main thread.  But I doubt
      that there are any plans to create any alternative.  In fact, I think that
      we do not want any alternative main thread because it would be hard to
      support consistency with the rest of the kthread worker API.
      
      The naming and function of kthread_create_worker() is inspired by the
      workqueues API like the rest of the kthread worker API.
      
      The kthread_create_worker_on_cpu() variant is motivated by the original
      kthread_create_on_cpu().  Note that we need to bind per-CPU kthread
      workers already when they are created.  It makes the life easier.
      kthread_bind() could not be used later for an already running worker.
      
      This patch does _not_ convert existing kthread workers.  The kthread
      worker API need more improvements first, e.g.  a function to destroy the
      worker.
      
      IMPORTANT:
      
      kthread_create_worker_on_cpu() allows to use any format of the worker
      name, in compare with kthread_create_on_cpu().  The good thing is that it
      is more generic.  The bad thing is that most users will need to pass the
      cpu number in two parameters, e.g.  kthread_create_worker_on_cpu(cpu,
      "helper/%d", cpu).
      
      To be honest, the main motivation was to avoid the need for an empty
      va_list.  The only legal way was to create a helper function that would be
      called with an empty list.  Other attempts caused compilation warnings or
      even errors on different architectures.
      
      There were also other alternatives, for example, using #define or
      splitting __kthread_create_worker().  The used solution looked like the
      least ugly.
      
      Link: http://lkml.kernel.org/r/1470754545-17632-6-git-send-email-pmladek@suse.comSigned-off-by: default avatarPetr Mladek <pmladek@suse.com>
      Acked-by: default avatarTejun Heo <tj@kernel.org>
      Cc: Oleg Nesterov <oleg@redhat.com>
      Cc: Ingo Molnar <mingo@redhat.com>
      Cc: Peter Zijlstra <peterz@infradead.org>
      Cc: Steven Rostedt <rostedt@goodmis.org>
      Cc: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
      Cc: Josh Triplett <josh@joshtriplett.org>
      Cc: Thomas Gleixner <tglx@linutronix.de>
      Cc: Jiri Kosina <jkosina@suse.cz>
      Cc: Borislav Petkov <bp@suse.de>
      Cc: Michal Hocko <mhocko@suse.cz>
      Cc: Vlastimil Babka <vbabka@suse.cz>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      fbae2d44