diff options
author | Tony Lindgren <tony@atomide.com> | 2014-09-16 13:50:01 -0700 |
---|---|---|
committer | Tony Luck <tony.luck@intel.com> | 2014-12-11 13:38:31 -0800 |
commit | 027bc8b08242c59e19356b4b2c189f2d849ab660 (patch) | |
tree | 4bd5ad81fef12692af2c9d278f14903d15ddfb60 /Documentation/input | |
parent | 7ae9cb81933515dc7db1aa3c47ef7653717e3090 (diff) | |
download | op-kernel-dev-027bc8b08242c59e19356b4b2c189f2d849ab660.zip op-kernel-dev-027bc8b08242c59e19356b4b2c189f2d849ab660.tar.gz |
pstore-ram: Allow optional mapping with pgprot_noncached
On some ARMs the memory can be mapped pgprot_noncached() and still
be working for atomic operations. As pointed out by Colin Cross
<ccross@android.com>, in some cases you do want to use
pgprot_noncached() if the SoC supports it to see a debug printk
just before a write hanging the system.
On ARMs, the atomic operations on strongly ordered memory are
implementation defined. So let's provide an optional kernel parameter
for configuring pgprot_noncached(), and use pgprot_writecombine() by
default.
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Rob Herring <robherring2@gmail.com>
Cc: Randy Dunlap <rdunlap@infradead.org>
Cc: Anton Vorontsov <anton@enomsg.org>
Cc: Colin Cross <ccross@android.com>
Cc: Olof Johansson <olof@lixom.net>
Cc: Russell King <linux@arm.linux.org.uk>
Cc: stable@vger.kernel.org
Acked-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>
Diffstat (limited to 'Documentation/input')
0 files changed, 0 insertions, 0 deletions