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    SLOW_WORK: Fix the CONFIG_MODULES=n case · fa1dae49
    David Howells 提交于
    Commits 3d7a641e ("SLOW_WORK: Wait for outstanding work items belonging to a
    module to clear") introduced some code to make sure that all of a module's
    slow-work items were complete before that module was removed, and commit
    3bde31a4 ("SLOW_WORK: Allow a requeueable work item to sleep till the thread is
    needed") further extended that, breaking it in the process if CONFIG_MODULES=n:
    
        CC      kernel/slow-work.o
      kernel/slow-work.c: In function 'slow_work_execute':
      kernel/slow-work.c:313: error: 'slow_work_thread_processing' undeclared (first use in this function)
      kernel/slow-work.c:313: error: (Each undeclared identifier is reported only once
      kernel/slow-work.c:313: error: for each function it appears in.)
      kernel/slow-work.c: In function 'slow_work_wait_for_items':
      kernel/slow-work.c:950: error: 'slow_work_unreg_sync_lock' undeclared (first use in this function)
      kernel/slow-work.c:951: error: 'slow_work_unreg_wq' undeclared (first use in this function)
      kernel/slow-work.c:961: error: 'slow_work_unreg_work_item' undeclared (first use in this function)
      kernel/slow-work.c:974: error: 'slow_work_unreg_module' undeclared (first use in this function)
      kernel/slow-work.c:977: error: 'slow_work_thread_processing' undeclared (first use in this function)
      make[1]: *** [kernel/slow-work.o] Error 1
    
    Fix this by:
    
     (1) Extracting the bits of slow_work_execute() that are contingent on
         CONFIG_MODULES, and the bits that should be, into inline functions and
         placing them into the #ifdef'd section that defines the relevant variables
         and adding stubs for moduleless kernels.  This allows the removal of some
         #ifdefs.
    
     (2) #ifdef'ing out the contents of slow_work_wait_for_items() in moduleless
         kernels.
    
    The four functions related to handling module unloading synchronisation (and
    their associated variables) could be offloaded into a separate .c file, but
    each function is only used once and three of them are tiny, so doing so would
    prevent them from being inlined.
    Reported-by: NIngo Molnar <mingo@elte.hu>
    Signed-off-by: NDavid Howells <dhowells@redhat.com>
    Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
    fa1dae49
slow-work.c 30.4 KB