John David Anglin 2e56b37b1d parisc: Define mb() and add memory barriers to assembler unlock sequences ... commit fedb8da963 upstream. For years I thought all parisc machines executed loads and stores in order. However, Jeff Law recently indicated on gcc-patches that this is not correct. There are various degrees of out-of-order execution all the way back to the PA7xxx processor series (hit-under-miss). The PA8xxx series has full out-of-order execution for both integer operations, and loads and stores. This is described in the following article: http://web.archive.org/web/20040214092531/http://www.cpus.hp.com/technical_references/advperf.shtml For this reason, we need to define mb() and to insert a memory barrier before the store unlocking spinlocks. This ensures that all memory accesses are complete prior to unlocking. The ldcw instruction performs the same function on entry. 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> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2018-08-15 18:12:46 +02:00
..
boot	parisc: Fix indenting in puts()	2017-12-29 17:53:47 +01:00
configs	net: Remove CONFIG_NETFILTER_DEBUG and _ASSERT() macros.	2017-09-04 13:25:20 +02:00
include	parisc: Define mb() and add memory barriers to assembler unlock sequences	2018-08-15 18:12:46 +02:00
kernel	parisc: Define mb() and add memory barriers to assembler unlock sequences	2018-08-15 18:12:46 +02:00
lib	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
math-emu	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
mm	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
oprofile	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
Kconfig	parisc: Enable CONFIG_MLONGCALLS by default	2018-08-15 18:12:46 +02:00
Kconfig.debug	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
Makefile	parisc: Reintroduce option to gzip-compress the kernel	2017-09-22 22:26:41 +02:00
defpalo.conf	parisc: switch to gzip-compressed vmlinuz kernel	2013-07-09 22:09:20 +02:00
install.sh	parisc: make "make install" not depend on vmlinux	2013-11-07 22:28:06 +01:00
nm	…