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| author |   John David Anglin <dave.anglin@bell.net> | 2018-08-12 16:31:17 -0400 |
|---|---|---|
| committer |   Helge Deller <deller@gmx.de> | 2018-08-13 09:31:25 +0200 |
| commit | 3b885ac1dc35b87a39ee176a6c7e2af9c789d8b8 (patch) | |
| tree | 02d868f6c7430cec3e2f66eac338056dbd6908c4 /arch/parisc/kernel | |
| parent | parisc: Remove ordered stores from syscall.S (diff) | |
| download | linux-dev-3b885ac1dc35b87a39ee176a6c7e2af9c789d8b8.tar.xz linux-dev-3b885ac1dc35b87a39ee176a6c7e2af9c789d8b8.zip | |
parisc: Remove unnecessary barriers from spinlock.h
Now that mb() is an instruction barrier, it will slow performance if we issue
unnecessary barriers.
The spinlock defines have a number of unnecessary barriers. The __ldcw()
define is both a hardware and compiler barrier. The mb() barriers in the
routines using __ldcw() serve no purpose.
The only barrier needed is the one in arch_spin_unlock(). We need to ensure
all accesses are complete prior to releasing the lock.
Signed-off-by: John David Anglin <dave.anglin@bell.net>
Cc: stable@vger.kernel.org # 4.0+
Signed-off-by: Helge Deller <deller@gmx.de>
Diffstat (limited to '')
0 files changed, 0 insertions, 0 deletions