• Paul Burton's avatar
    locking/qspinlock: Include linux/prefetch.h · d40e0d4f
    Paul Burton authored
    
    
    kernel/locking/qspinlock.c makes use of prefetchw() but hasn't included
    linux/prefetch.h up until now, instead relying upon indirect inclusion
    of some header that defines prefetchw().
    
    In the case of MIPS we generally obtain a definition of prefetchw() from
    asm/processor.h, included by way of linux/mutex.h, but only for
    configurations which select CONFIG_CPU_HAS_PREFETCH. For configurations
    which don't this leaves prefetchw() undefined leading to the following
    build failure:
    
      CC      kernel/locking/qspinlock.o
      kernel/locking/qspinlock.c: In function ‘queued_spin_lock_slowpath’:
      kernel/locking/qspinlock.c:549:4: error: implicit declaration of
          function ‘prefetchw’ [-Werror=implicit-function-declaration]
        prefetchw(next);
        ^~~~~~~~~
    
    Fix this by including linux/prefetch.h in order to ensure that we get a
    definition of prefetchw().
    Signed-off-by: default avatarPaul Burton <paul.burton@imgtec.com>
    Cc: Ingo Molnar <mingo@redhat.com>
    Cc: Peter Zijlstra <peterz@infradead.org>
    Cc: linux-kernel@vger.kernel.org
    Cc: linux-mips@linux-mips.org
    Signed-off-by: default avatarRalf Baechle <ralf@linux-mips.org>
    d40e0d4f
qspinlock.c 17.9 KB