1. 05 Jan, 2018 1 commit
  2. 21 Nov, 2017 1 commit
    • Kees Cook's avatar
      treewide: setup_timer() -> timer_setup() · e99e88a9
      Kees Cook authored
      This converts all remaining cases of the old setup_timer() API into using
      timer_setup(), where the callback argument is the structure already
      holding the struct timer_list. These should have no behavioral changes,
      since they just change which pointer is passed into the callback with
      the same available pointers after conversion. It handles the following
      examples, in addition to some other variations.
      
      Casting from unsigned long:
      
          void my_callback(unsigned long data)
          {
              struct something *ptr = (struct something *)data;
          ...
          }
          ...
          setup_timer(&ptr->my_timer, my_callback, ptr);
      
      and forced object casts:
      
          void my_callback(struct something *ptr)
          {
          ...
          }
          ...
          setup_timer(&ptr->my_timer, my_callback, (unsigned long)ptr);
      
      become:
      
          void my_callback(struct timer_list *t)
          {
              struct something *ptr = from_timer(ptr, t, my_timer);
          ...
          }
          ...
          timer_setup(&ptr->my_timer, my_callback, 0);
      
      Direct function assignments:
      
          void my_callback(unsigned long data)
          {
              struct something *ptr = (struct something *)data;
          ...
          }
          ...
          ptr->my_timer.function = my_callback;
      
      have a temporary cast added, along with converting the args:
      
          void my_callback(struct timer_list *t)
          {
              struct something *ptr = from_timer(ptr, t, my_timer);
          ...
          }
          ...
          ptr->my_timer.function = (TIMER_FUNC_TYPE)my_callback;
      
      And finally, callbacks without a data assignment:
      
          void my_callback(unsigned long data)
          {
          ...
          }
          ...
          setup_timer(&ptr->my_timer, my_callback, 0);
      
      have their argument renamed to verify they're unused during conversion:
      
          void my_callback(struct timer_list *unused)
          {
          ...
          }
          ...
          timer_setup(&ptr->my_timer, my_callback, 0);
      
      The conversion is done with the following Coccinelle script:
      
      spatch --very-quiet --all-includes --include-headers \
      	-I ./arch/x86/include -I ./arch/x86/include/generated \
      	-I ./include -I ./arch/x86/include/uapi \
      	-I ./arch/x86/include/generated/uapi -I ./include/uapi \
      	-I ./include/generated/uapi --include ./include/linux/kconfig.h \
      	--dir . \
      	--cocci-file ~/src/data/timer_setup.cocci
      
      @fix_address_of@
      expression e;
      @@
      
       setup_timer(
      -&(e)
      +&e
       , ...)
      
      // Update any raw setup_timer() usages that have a NULL callback, but
      // would otherwise match change_timer_function_usage, since the latter
      // will update all function assignments done in the face of a NULL
      // function initialization in setup_timer().
      @change_timer_function_usage_NULL@
      expression _E;
      identifier _timer;
      type _cast_data;
      @@
      
      (
      -setup_timer(&_E->_timer, NULL, _E);
      +timer_setup(&_E->_timer, NULL, 0);
      |
      -setup_timer(&_E->_timer, NULL, (_cast_data)_E);
      +timer_setup(&_E->_timer, NULL, 0);
      |
      -setup_timer(&_E._timer, NULL, &_E);
      +timer_setup(&_E._timer, NULL, 0);
      |
      -setup_timer(&_E._timer, NULL, (_cast_data)&_E);
      +timer_setup(&_E._timer, NULL, 0);
      )
      
      @change_timer_function_usage@
      expression _E;
      identifier _timer;
      struct timer_list _stl;
      identifier _callback;
      type _cast_func, _cast_data;
      @@
      
      (
      -setup_timer(&_E->_timer, _callback, _E);
      +timer_setup(&_E->_timer, _callback, 0);
      |
      -setup_timer(&_E->_timer, &_callback, _E);
      +timer_setup(&_E->_timer, _callback, 0);
      |
      -setup_timer(&_E->_timer, _callback, (_cast_data)_E);
      +timer_setup(&_E->_timer, _callback, 0);
      |
      -setup_timer(&_E->_timer, &_callback, (_cast_data)_E);
      +timer_setup(&_E->_timer, _callback, 0);
      |
      -setup_timer(&_E->_timer, (_cast_func)_callback, _E);
      +timer_setup(&_E->_timer, _callback, 0);
      |
      -setup_timer(&_E->_timer, (_cast_func)&_callback, _E);
      +timer_setup(&_E->_timer, _callback, 0);
      |
      -setup_timer(&_E->_timer, (_cast_func)_callback, (_cast_data)_E);
      +timer_setup(&_E->_timer, _callback, 0);
      |
      -setup_timer(&_E->_timer, (_cast_func)&_callback, (_cast_data)_E);
      +timer_setup(&_E->_timer, _callback, 0);
      |
      -setup_timer(&_E._timer, _callback, (_cast_data)_E);
      +timer_setup(&_E._timer, _callback, 0);
      |
      -setup_timer(&_E._timer, _callback, (_cast_data)&_E);
      +timer_setup(&_E._timer, _callback, 0);
      |
      -setup_timer(&_E._timer, &_callback, (_cast_data)_E);
      +timer_setup(&_E._timer, _callback, 0);
      |
      -setup_timer(&_E._timer, &_callback, (_cast_data)&_E);
      +timer_setup(&_E._timer, _callback, 0);
      |
      -setup_timer(&_E._timer, (_cast_func)_callback, (_cast_data)_E);
      +timer_setup(&_E._timer, _callback, 0);
      |
      -setup_timer(&_E._timer, (_cast_func)_callback, (_cast_data)&_E);
      +timer_setup(&_E._timer, _callback, 0);
      |
      -setup_timer(&_E._timer, (_cast_func)&_callback, (_cast_data)_E);
      +timer_setup(&_E._timer, _callback, 0);
      |
      -setup_timer(&_E._timer, (_cast_func)&_callback, (_cast_data)&_E);
      +timer_setup(&_E._timer, _callback, 0);
      |
       _E->_timer@_stl.function = _callback;
      |
       _E->_timer@_stl.function = &_callback;
      |
       _E->_timer@_stl.function = (_cast_func)_callback;
      |
       _E->_timer@_stl.function = (_cast_func)&_callback;
      |
       _E._timer@_stl.function = _callback;
      |
       _E._timer@_stl.function = &_callback;
      |
       _E._timer@_stl.function = (_cast_func)_callback;
      |
       _E._timer@_stl.function = (_cast_func)&_callback;
      )
      
      // callback(unsigned long arg)
      @change_callback_handle_cast
       depends on change_timer_function_usage@
      identifier change_timer_function_usage._callback;
      identifier change_timer_function_usage._timer;
      type _origtype;
      identifier _origarg;
      type _handletype;
      identifier _handle;
      @@
      
       void _callback(
      -_origtype _origarg
      +struct timer_list *t
       )
       {
      (
      	... when != _origarg
      	_handletype *_handle =
      -(_handletype *)_origarg;
      +from_timer(_handle, t, _timer);
      	... when != _origarg
      |
      	... when != _origarg
      	_handletype *_handle =
      -(void *)_origarg;
      +from_timer(_handle, t, _timer);
      	... when != _origarg
      |
      	... when != _origarg
      	_handletype *_handle;
      	... when != _handle
      	_handle =
      -(_handletype *)_origarg;
      +from_timer(_handle, t, _timer);
      	... when != _origarg
      |
      	... when != _origarg
      	_handletype *_handle;
      	... when != _handle
      	_handle =
      -(void *)_origarg;
      +from_timer(_handle, t, _timer);
      	... when != _origarg
      )
       }
      
      // callback(unsigned long arg) without existing variable
      @change_callback_handle_cast_no_arg
       depends on change_timer_function_usage &&
                           !change_callback_handle_cast@
      identifier change_timer_function_usage._callback;
      identifier change_timer_function_usage._timer;
      type _origtype;
      identifier _origarg;
      type _handletype;
      @@
      
       void _callback(
      -_origtype _origarg
      +struct timer_list *t
       )
       {
      +	_handletype *_origarg = from_timer(_origarg, t, _timer);
      +
      	... when != _origarg
      -	(_handletype *)_origarg
      +	_origarg
      	... when != _origarg
       }
      
      // Avoid already converted callbacks.
      @match_callback_converted
       depends on change_timer_function_usage &&
                  !change_callback_handle_cast &&
      	    !change_callback_handle_cast_no_arg@
      identifier change_timer_function_usage._callback;
      identifier t;
      @@
      
       void _callback(struct timer_list *t)
       { ... }
      
      // callback(struct something *handle)
      @change_callback_handle_arg
       depends on change_timer_function_usage &&
      	    !match_callback_converted &&
                  !change_callback_handle_cast &&
                  !change_callback_handle_cast_no_arg@
      identifier change_timer_function_usage._callback;
      identifier change_timer_function_usage._timer;
      type _handletype;
      identifier _handle;
      @@
      
       void _callback(
      -_handletype *_handle
      +struct timer_list *t
       )
       {
      +	_handletype *_handle = from_timer(_handle, t, _timer);
      	...
       }
      
      // If change_callback_handle_arg ran on an empty function, remove
      // the added handler.
      @unchange_callback_handle_arg
       depends on change_timer_function_usage &&
      	    change_callback_handle_arg@
      identifier change_timer_function_usage._callback;
      identifier change_timer_function_usage._timer;
      type _handletype;
      identifier _handle;
      identifier t;
      @@
      
       void _callback(struct timer_list *t)
       {
      -	_handletype *_handle = from_timer(_handle, t, _timer);
       }
      
      // We only want to refactor the setup_timer() data argument if we've found
      // the matching callback. This undoes changes in change_timer_function_usage.
      @unchange_timer_function_usage
       depends on change_timer_function_usage &&
                  !change_callback_handle_cast &&
                  !change_callback_handle_cast_no_arg &&
      	    !change_callback_handle_arg@
      expression change_timer_function_usage._E;
      identifier change_timer_function_usage._timer;
      identifier change_timer_function_usage._callback;
      type change_timer_function_usage._cast_data;
      @@
      
      (
      -timer_setup(&_E->_timer, _callback, 0);
      +setup_timer(&_E->_timer, _callback, (_cast_data)_E);
      |
      -timer_setup(&_E._timer, _callback, 0);
      +setup_timer(&_E._timer, _callback, (_cast_data)&_E);
      )
      
      // If we fixed a callback from a .function assignment, fix the
      // assignment cast now.
      @change_timer_function_assignment
       depends on change_timer_function_usage &&
                  (change_callback_handle_cast ||
                   change_callback_handle_cast_no_arg ||
                   change_callback_handle_arg)@
      expression change_timer_function_usage._E;
      identifier change_timer_function_usage._timer;
      identifier change_timer_function_usage._callback;
      type _cast_func;
      typedef TIMER_FUNC_TYPE;
      @@
      
      (
       _E->_timer.function =
      -_callback
      +(TIMER_FUNC_TYPE)_callback
       ;
      |
       _E->_timer.function =
      -&_callback
      +(TIMER_FUNC_TYPE)_callback
       ;
      |
       _E->_timer.function =
      -(_cast_func)_callback;
      +(TIMER_FUNC_TYPE)_callback
       ;
      |
       _E->_timer.function =
      -(_cast_func)&_callback
      +(TIMER_FUNC_TYPE)_callback
       ;
      |
       _E._timer.function =
      -_callback
      +(TIMER_FUNC_TYPE)_callback
       ;
      |
       _E._timer.function =
      -&_callback;
      +(TIMER_FUNC_TYPE)_callback
       ;
      |
       _E._timer.function =
      -(_cast_func)_callback
      +(TIMER_FUNC_TYPE)_callback
       ;
      |
       _E._timer.function =
      -(_cast_func)&_callback
      +(TIMER_FUNC_TYPE)_callback
       ;
      )
      
      // Sometimes timer functions are called directly. Replace matched args.
      @change_timer_function_calls
       depends on change_timer_function_usage &&
                  (change_callback_handle_cast ||
                   change_callback_handle_cast_no_arg ||
                   change_callback_handle_arg)@
      expression _E;
      identifier change_timer_function_usage._timer;
      identifier change_timer_function_usage._callback;
      type _cast_data;
      @@
      
       _callback(
      (
      -(_cast_data)_E
      +&_E->_timer
      |
      -(_cast_data)&_E
      +&_E._timer
      |
      -_E
      +&_E->_timer
      )
       )
      
      // If a timer has been configured without a data argument, it can be
      // converted without regard to the callback argument, since it is unused.
      @match_timer_function_unused_data@
      expression _E;
      identifier _timer;
      identifier _callback;
      @@
      
      (
      -setup_timer(&_E->_timer, _callback, 0);
      +timer_setup(&_E->_timer, _callback, 0);
      |
      -setup_timer(&_E->_timer, _callback, 0L);
      +timer_setup(&_E->_timer, _callback, 0);
      |
      -setup_timer(&_E->_timer, _callback, 0UL);
      +timer_setup(&_E->_timer, _callback, 0);
      |
      -setup_timer(&_E._timer, _callback, 0);
      +timer_setup(&_E._timer, _callback, 0);
      |
      -setup_timer(&_E._timer, _callback, 0L);
      +timer_setup(&_E._timer, _callback, 0);
      |
      -setup_timer(&_E._timer, _callback, 0UL);
      +timer_setup(&_E._timer, _callback, 0);
      |
      -setup_timer(&_timer, _callback, 0);
      +timer_setup(&_timer, _callback, 0);
      |
      -setup_timer(&_timer, _callback, 0L);
      +timer_setup(&_timer, _callback, 0);
      |
      -setup_timer(&_timer, _callback, 0UL);
      +timer_setup(&_timer, _callback, 0);
      |
      -setup_timer(_timer, _callback, 0);
      +timer_setup(_timer, _callback, 0);
      |
      -setup_timer(_timer, _callback, 0L);
      +timer_setup(_timer, _callback, 0);
      |
      -setup_timer(_timer, _callback, 0UL);
      +timer_setup(_timer, _callback, 0);
      )
      
      @change_callback_unused_data
       depends on match_timer_function_unused_data@
      identifier match_timer_function_unused_data._callback;
      type _origtype;
      identifier _origarg;
      @@
      
       void _callback(
      -_origtype _origarg
      +struct timer_list *unused
       )
       {
      	... when != _origarg
       }
      Signed-off-by: 's avatarKees Cook <keescook@chromium.org>
      e99e88a9
  3. 07 Oct, 2017 3 commits
    • Mathias Krause's avatar
      padata: ensure padata_do_serial() runs on the correct CPU · 350ef88e
      Mathias Krause authored
      If the algorithm we're parallelizing is asynchronous we might change
      CPUs between padata_do_parallel() and padata_do_serial(). However, we
      don't expect this to happen as we need to enqueue the padata object into
      the per-cpu reorder queue we took it from, i.e. the same-cpu's parallel
      queue.
      
      Ensure we're not switching CPUs for a given padata object by tracking
      the CPU within the padata object. If the serial callback gets called on
      the wrong CPU, defer invoking padata_reorder() via a kernel worker on
      the CPU we're expected to run on.
      Signed-off-by: 's avatarMathias Krause <minipli@googlemail.com>
      Signed-off-by: 's avatarHerbert Xu <herbert@gondor.apana.org.au>
      350ef88e
    • Mathias Krause's avatar
      padata: ensure the reorder timer callback runs on the correct CPU · cf5868c8
      Mathias Krause authored
      The reorder timer function runs on the CPU where the timer interrupt was
      handled which is not necessarily one of the CPUs of the 'pcpu' CPU mask
      set.
      
      Ensure the padata_reorder() callback runs on the correct CPU, which is
      one in the 'pcpu' CPU mask set and, preferrably, the next expected one.
      Do so by comparing the current CPU with the expected target CPU. If they
      match, call padata_reorder() right away. If they differ, schedule a work
      item on the target CPU that does the padata_reorder() call for us.
      Signed-off-by: 's avatarMathias Krause <minipli@googlemail.com>
      Signed-off-by: 's avatarHerbert Xu <herbert@gondor.apana.org.au>
      cf5868c8
    • Mathias Krause's avatar
      padata: set cpu_index of unused CPUs to -1 · 1bd845bc
      Mathias Krause authored
      The parallel queue per-cpu data structure gets initialized only for CPUs
      in the 'pcpu' CPU mask set. This is not sufficient as the reorder timer
      may run on a different CPU and might wrongly decide it's the target CPU
      for the next reorder item as per-cpu memory gets memset(0) and we might
      be waiting for the first CPU in cpumask.pcpu, i.e. cpu_index 0.
      
      Make the '__this_cpu_read(pd->pqueue->cpu_index) == next_queue->cpu_index'
      compare in padata_get_next() fail in this case by initializing the
      cpu_index member of all per-cpu parallel queues. Use -1 for unused ones.
      Signed-off-by: 's avatarMathias Krause <minipli@googlemail.com>
      Signed-off-by: 's avatarHerbert Xu <herbert@gondor.apana.org.au>
      1bd845bc
  4. 26 May, 2017 2 commits
  5. 21 Apr, 2017 1 commit
  6. 10 Apr, 2017 1 commit
  7. 24 Mar, 2017 1 commit
    • Jason A. Donenfeld's avatar
      padata: avoid race in reordering · de5540d0
      Jason A. Donenfeld authored
      Under extremely heavy uses of padata, crashes occur, and with list
      debugging turned on, this happens instead:
      
      [87487.298728] WARNING: CPU: 1 PID: 882 at lib/list_debug.c:33
      __list_add+0xae/0x130
      [87487.301868] list_add corruption. prev->next should be next
      (ffffb17abfc043d0), but was ffff8dba70872c80. (prev=ffff8dba70872b00).
      [87487.339011]  [<ffffffff9a53d075>] dump_stack+0x68/0xa3
      [87487.342198]  [<ffffffff99e119a1>] ? console_unlock+0x281/0x6d0
      [87487.345364]  [<ffffffff99d6b91f>] __warn+0xff/0x140
      [87487.348513]  [<ffffffff99d6b9aa>] warn_slowpath_fmt+0x4a/0x50
      [87487.351659]  [<ffffffff9a58b5de>] __list_add+0xae/0x130
      [87487.354772]  [<ffffffff9add5094>] ? _raw_spin_lock+0x64/0x70
      [87487.357915]  [<ffffffff99eefd66>] padata_reorder+0x1e6/0x420
      [87487.361084]  [<ffffffff99ef0055>] padata_do_serial+0xa5/0x120
      
      padata_reorder calls list_add_tail with the list to which its adding
      locked, which seems correct:
      
      spin_lock(&squeue->serial.lock);
      list_add_tail(&padata->list, &squeue->serial.list);
      spin_unlock(&squeue->serial.lock);
      
      This therefore leaves only place where such inconsistency could occur:
      if padata->list is added at the same time on two different threads.
      This pdata pointer comes from the function call to
      padata_get_next(pd), which has in it the following block:
      
      next_queue = per_cpu_ptr(pd->pqueue, cpu);
      padata = NULL;
      reorder = &next_queue->reorder;
      if (!list_empty(&reorder->list)) {
             padata = list_entry(reorder->list.next,
                                 struct padata_priv, list);
             spin_lock(&reorder->lock);
             list_del_init(&padata->list);
             atomic_dec(&pd->reorder_objects);
             spin_unlock(&reorder->lock);
      
             pd->processed++;
      
             goto out;
      }
      out:
      return padata;
      
      I strongly suspect that the problem here is that two threads can race
      on reorder list. Even though the deletion is locked, call to
      list_entry is not locked, which means it's feasible that two threads
      pick up the same padata object and subsequently call list_add_tail on
      them at the same time. The fix is thus be hoist that lock outside of
      that block.
      Signed-off-by: 's avatarJason A. Donenfeld <Jason@zx2c4.com>
      Acked-by: 's avatarSteffen Klassert <steffen.klassert@secunet.com>
      Signed-off-by: 's avatarHerbert Xu <herbert@gondor.apana.org.au>
      de5540d0
  8. 25 Oct, 2016 1 commit
  9. 19 Sep, 2016 1 commit
  10. 20 May, 2016 2 commits
    • Arnd Bergmann's avatar
      kernel/padata.c: hide unused functions · 19d795b6
      Arnd Bergmann authored
      A recent cleanup removed some exported functions that were not used
      anywhere, which in turn exposed the fact that some other functions in
      the same file are only used in some configurations.
      
      We now get a warning about them when CONFIG_HOTPLUG_CPU is disabled:
      
        kernel/padata.c:670:12: error: '__padata_remove_cpu' defined but not used [-Werror=unused-function]
         static int __padata_remove_cpu(struct padata_instance *pinst, int cpu)
                    ^~~~~~~~~~~~~~~~~~~
        kernel/padata.c:650:12: error: '__padata_add_cpu' defined but not used [-Werror=unused-function]
         static int __padata_add_cpu(struct padata_instance *pinst, int cpu)
      
      This rearranges the code so the __padata_remove_cpu/__padata_add_cpu
      functions are within the #ifdef that protects the code that calls them.
      
      [akpm@linux-foundation.org: coding-style fixes]
      Fixes: 4ba6d78c671e ("kernel/padata.c: removed unused code")
      Signed-off-by: 's avatarArnd Bergmann <arnd@arndb.de>
      Cc: Richard Cochran <rcochran@linutronix.de>
      Cc: Steffen Klassert <steffen.klassert@secunet.com>
      Signed-off-by: 's avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: 's avatarLinus Torvalds <torvalds@linux-foundation.org>
      19d795b6
    • Richard Cochran's avatar
      kernel/padata.c: removed unused code · 815613da
      Richard Cochran authored
      By accident I stumbled across code that has never been used.  This
      driver has EXPORT_SYMBOL functions, and the only user of the code is
      pcrypt.c, but this only uses a subset of the exported symbols.
      
      According to 'git log -G', the functions, padata_set_cpumasks,
      padata_add_cpu, and padata_remove_cpu have never been used since they
      were first introduced.  This patch removes the unused code.
      
      On one 64 bit build, with CRYPTO_PCRYPT built in, the text is more than
      4k smaller.
      
        kbuild_hp> size $KBUILD_OUTPUT/vmlinux
            text    data     bss      dec hex    filename
        10566658 4678360 1122304 16367322 f9beda vmlinux
        10561984 4678360 1122304 16362648 f9ac98 vmlinux
      
      On another config, 32 bit, the saving is about 0.5k bytes.
      
        kbuild_hp-x86> size $KBUILD_OUTPUT/vmlinux
        6012005 2409513 2785280 11206798 ab008e vmlinux
        6011491 2409513 2785280 11206284 aafe8c vmlinux
      Signed-off-by: 's avatarRichard Cochran <rcochran@linutronix.de>
      Cc: Steffen Klassert <steffen.klassert@secunet.com>
      Cc: Herbert Xu <herbert@gondor.apana.org.au>
      Cc: "David S. Miller" <davem@davemloft.net>
      Signed-off-by: 's avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: 's avatarLinus Torvalds <torvalds@linux-foundation.org>
      815613da
  11. 14 Feb, 2015 1 commit
  12. 05 Dec, 2013 1 commit
  13. 30 Oct, 2013 1 commit
  14. 29 Aug, 2013 2 commits
  15. 06 Dec, 2012 1 commit
  16. 29 Mar, 2012 3 commits
  17. 14 Mar, 2012 2 commits
  18. 31 Oct, 2011 1 commit
    • Paul Gortmaker's avatar
      kernel: Map most files to use export.h instead of module.h · 9984de1a
      Paul Gortmaker authored
      The changed files were only including linux/module.h for the
      EXPORT_SYMBOL infrastructure, and nothing else.  Revector them
      onto the isolated export header for faster compile times.
      
      Nothing to see here but a whole lot of instances of:
      
        -#include <linux/module.h>
        +#include <linux/export.h>
      
      This commit is only changing the kernel dir; next targets
      will probably be mm, fs, the arch dirs, etc.
      Signed-off-by: 's avatarPaul Gortmaker <paul.gortmaker@windriver.com>
      9984de1a
  19. 31 Mar, 2011 1 commit
  20. 31 Jul, 2010 4 commits
  21. 26 Jul, 2010 3 commits
  22. 19 Jul, 2010 2 commits
    • Dan Kruchinin's avatar
      padata: Added sysfs primitives to padata subsystem · 5e017dc3
      Dan Kruchinin authored
      Added sysfs primitives to padata subsystem. Now API user may
      embedded kobject each padata instance contains into any sysfs
      hierarchy. For now padata sysfs interface provides only
      two objects:
          serial_cpumask   [RW] - cpumask for serial workers
          parallel_cpumask [RW] - cpumask for parallel workers
      Signed-off-by: 's avatarDan Kruchinin <dkruchinin@acm.org>
      Signed-off-by: 's avatarHerbert Xu <herbert@gondor.apana.org.au>
      5e017dc3
    • Dan Kruchinin's avatar
      padata: Make two separate cpumasks · e15bacbe
      Dan Kruchinin authored
      The aim of this patch is to make two separate cpumasks
      for padata parallel and serial workers respectively.
      It allows user to make more thin and sophisticated configurations
      of padata framework. For example user may bind parallel and serial workers to non-intersecting
      CPU groups to gain better performance. Also each padata instance has notifiers chain for its
      cpumasks now. If either parallel or serial or both masks were changed all
      interested subsystems will get notification about that. It's especially useful
      if padata user uses algorithm for callback CPU selection according to serial cpumask.
      Signed-off-by: 's avatarDan Kruchinin <dkruchinin@acm.org>
      Signed-off-by: 's avatarHerbert Xu <herbert@gondor.apana.org.au>
      e15bacbe
  23. 14 Jul, 2010 4 commits