Commit d40e0d4f authored by Paul Burton's avatar Paul Burton Committed by Ralf Baechle
Browse files

locking/qspinlock: Include linux/prefetch.h

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]

Fix this by including linux/prefetch.h in order to ensure that we get a
definition of prefetchw().
Signed-off-by: default avatarPaul Burton <>
Cc: Ingo Molnar <>
Cc: Peter Zijlstra <>
Signed-off-by: default avatarRalf Baechle <>
parent e5f5a5b0
......@@ -28,6 +28,7 @@
#include <linux/percpu.h>
#include <linux/hardirq.h>
#include <linux/mutex.h>
#include <linux/prefetch.h>
#include <asm/byteorder.h>
#include <asm/qspinlock.h>
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