kernel/git/stable/linux.git/Documentation/volatile-considered-harmful.txt, branch master

docs-rst: add documents to development-process

2016-10-24T10:12:35+00:00

Add several documents to the development-process ReST book. As we don't want renames, use symlinks instead, keeping those documents on their original place. Acked-by: Greg Kroah-Hartman Signed-off-by: Mauro Carvalho Chehab

Documentation/volatile-considered-harmful.txt: convert to ReST markup

2016-10-24T10:12:35+00:00

- Fix document section markups; - use quote blocks where needed; - adjust spaces and blank lines; - add it to the development-processs book. Signed-off-by: Mauro Carvalho Chehab

Documentation/volatile-considered-harmful.txt: correct cpu_relax() documentation

2010-03-24T23:31:20+00:00

cpu_relax() is documented in volatile-considered-harmful.txt to be a memory barrier. However, everyone with the exception of Blackfin and possibly ia64 defines cpu_relax() to be a compiler barrier. Make the documentation reflect the general concensus. Linus sayeth: : I don't think it was ever the intention that it would be seen as anything : but a compiler barrier, although it is obviously implied that it might : well perform some per-architecture actions that have "memory barrier-like" : semantics. : : After all, the whole and only point of the "cpu_relax()" thing is to tell : the CPU that we're busy-looping on some event. : : And that "event" might be (and often is) about reading the same memory : location over and over until it changes to what we want it to be. So it's : quite possible that on various architectures the "cpu_relax()" could be : about making sure that such a tight loop on loads doesn't starve cache : transactions, for example - and as such look a bit like a memory barrier : from a CPU standpoint. : : But it's not meant to have any kind of architectural memory ordering : semantics as far as the kernel is concerned - those must come from other : sources. Signed-off-by: Russell King Cc: Acked-by: Linus Torvalds Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

Documentation cleanup: trivial misspelling, punctuation, and grammar corrections.

2008-07-26T19:00:06+00:00

Cc: Randy Dunlap Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

"volatile considered harmful"

2007-06-24T15:59:11+00:00

Encourage developers to avoid the volatile type class in kernel code. Signed-off-by: Jonathan Corbet Signed-off-by: Jesper Juhl Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds