sparc32: Implement xchg and atomic_xchg using ATOMIC_HASH locks

Browse source

commit 1a17fdc4f4 upstream.

Atomicity between xchg and cmpxchg cannot be guaranteed when xchg is
implemented with a swap and cmpxchg is implemented with locks.
Without this, e.g. mcs_spin_lock and mcs_spin_unlock are broken.

Signed-off-by: Andreas Larsson <andreas@gaisler.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Luis Henriques <luis.henriques@canonical.com>

...

This commit is contained in:

Andreas Larsson 2014-11-05 15:52:08 +01:00 • committed by Luis Henriques

parent 816dcf66cc

commit 4f7e7dca2b

3 changed files with 30 additions and 11 deletions

Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL

Download patch file Download diff file Expand all files Collapse all files

2

arch/sparc/include/asm/atomic_32.h

View file

12

arch/sparc/include/asm/cmpxchg_32.h

View file

27

arch/sparc/lib/atomic32.c

View file