kernel/Documentation/ramoops.txt, branch linux-rolling-stable

docs-rst: create an user's manual book

2016-10-24T10:12:35Z

Place README, REPORTING-BUGS, SecurityBugs and kernel-parameters on an user's manual book. As we'll be numbering the user's manual, remove the manual numbering from SecurityBugs. Signed-off-by: Mauro Carvalho Chehab

Documentation/ramoops.txt: convert it to ReST format

2016-10-24T10:12:35Z

- Fix document title; - use quote blocks where needed; - use monotonic fonts for config options and file names; - adjust whitespaces and blank lines; - add it to the user's book. Signed-off-by: Mauro Carvalho Chehab

ramoops: use DT reserved-memory bindings

2016-08-05T18:21:36Z

Instead of a ramoops-specific node, use a child node of /reserved-memory. This requires that of_platform_device_create() be explicitly called for the node, though, since "/reserved-memory" does not have its own "compatible" property. Suggested-by: Rob Herring Signed-off-by: Kees Cook Acked-by: Rob Herring

pstore/ram: add Device Tree bindings

2016-06-14T18:34:39Z

ramoops is one of the remaining places where ARM vendors still rely on board-specific shims. Device Tree lets us replace those shims with generic code. These bindings mirror the ramoops module parameters, with two small differences: (1) dump_oops becomes an optional "no-dump-oops" property, since ramoops sets dump_oops=1 by default. (2) mem_type=1 becomes the more self-explanatory "unbuffered" property. Signed-off-by: Greg Hackmann [fixed platform_get_drvdata() crash, thanks to Brian Norris] [switched from u64 to u32 to simplify code, various whitespace fixes] [use dev_of_node() to gain code-elimination for CONFIG_OF=n] Signed-off-by: Kees Cook

pstore-ram: Allow optional mapping with pgprot_noncached

2014-12-11T21:38:31Z

On some ARMs the memory can be mapped pgprot_noncached() and still be working for atomic operations. As pointed out by Colin Cross , 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 Cc: Rob Herring Cc: Randy Dunlap Cc: Anton Vorontsov Cc: Colin Cross Cc: Olof Johansson Cc: Russell King Cc: stable@vger.kernel.org Acked-by: Kees Cook Signed-off-by: Tony Lindgren Signed-off-by: Tony Luck

pstore/ftrace: Convert to its own enable/disable debugfs knob

2012-09-07T05:16:58Z

With this patch we no longer reuse function tracer infrastructure, now we register our own tracer back-end via a debugfs knob. It's a bit more code, but that is the only downside. On the bright side we have: - Ability to make persistent_ram module removable (when needed, we can move ftrace_ops struct into a module). Note that persistent_ram is still not removable for other reasons, but with this patch it's just one thing less to worry about; - Pstore part is more isolated from the generic function tracer. We tried it already by registering our own tracer in available_tracers, but that way we're loosing ability to see the traces while we record them to pstore. This solution is somewhere in the middle: we only register "internal ftracer" back-end, but not the "front-end"; - When there is only pstore tracing enabled, the kernel will only write to the pstore buffer, omitting function tracer buffer (which, of course, still can be enabled via 'echo function > current_tracer'). Suggested-by: Steven Rostedt Signed-off-by: Anton Vorontsov

pstore/ram: Add ftrace messages handling

2012-07-17T17:14:17Z

The ftrace log size is configurable via ramoops.ftrace_size module option, and the log itself is available via /ftrace-ramoops file. Signed-off-by: Anton Vorontsov Signed-off-by: Greg Kroah-Hartman

pstore/ram: Add some more documentation and examples

2012-06-13T23:59:28Z

Suggested-by: Shuah Khan Signed-off-by: Anton Vorontsov Acked-by: Kees Cook Acked-by: Colin Cross Signed-off-by: Greg Kroah-Hartman

pstore/ram: Add ECC support

2012-05-17T15:51:59Z

This is now straightforward: just introduce a module parameter and pass the needed value to persistent_ram_new(). Signed-off-by: Anton Vorontsov Acked-by: Marco Stornelli Acked-by: Kees Cook Signed-off-by: Greg Kroah-Hartman

ramoops: Move to fs/pstore/ram.c

2012-05-16T15:06:37Z

Since ramoops was converted to pstore, it has nothing to do with character devices nowadays. Instead, today it is just a RAM backend for pstore. The patch just moves things around. There are a few changes were needed because of the move: 1. Kconfig and Makefiles fixups, of course. 2. In pstore/ram.c we have to play a bit with MODULE_PARAM_PREFIX, this is needed to keep user experience the same as with ramoops driver (i.e. so that ramoops.foo kernel command line arguments would still work). Signed-off-by: Anton Vorontsov Acked-by: Marco Stornelli Acked-by: Kees Cook Signed-off-by: Greg Kroah-Hartman