mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
synced 2026-05-09 03:10:30 -04:00
d40e0d4fb5
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: Paul 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: Ralf Baechle <ralf@linux-mips.org>
Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. Please read the Documentation/process/changes.rst file, as it contains the requirements for building and running the kernel, and information about the problems which may result by upgrading your kernel.