linux.git/Documentation/atomic_ops.txt, branch v2.6.26

documentation: atomic_add_unless() doesn't imply mb() on failure

2008-02-24T01:52:36+00:00

(sorry for being offtpoic, but while experts are here...)

A "typical" implementation of atomic_add_unless() can return 0 immediately
after the first atomic_read() (before doing cmpxchg). In that case it doesn't
provide any barrier semantics. See include/asm-ia64/atomic.h as an example.

We should either change the implementation, or fix the docs.

Signed-off-by: Oleg Nesterov 
Acked-by: Nick Piggin 
Signed-off-by: Linus Torvalds

bitops: introduce lock ops

2007-10-18T21:37:29+00:00

Introduce test_and_set_bit_lock / clear_bit_unlock bitops with lock semantics.
Convert all architectures to use the generic implementation.

Signed-off-by: Nick Piggin 
Acked-By: David Howells 
Cc: Richard Henderson 
Cc: Ivan Kokshaysky 
Cc: Russell King 
Cc: Haavard Skinnemoen 
Cc: Bryan Wu 
Cc: Mikael Starvik 
Cc: David Howells 
Cc: Yoshinori Sato 
Cc: "Luck, Tony" 
Cc: Hirokazu Takata 
Cc: Geert Uytterhoeven 
Cc: Roman Zippel 
Cc: Greg Ungerer 
Cc: Ralf Baechle 
Cc: Kyle McMartin 
Cc: Matthew Wilcox 
Cc: Paul Mackerras 
Cc: Benjamin Herrenschmidt 
Cc: Heiko Carstens 
Cc: Martin Schwidefsky 
Cc: Paul Mundt 
Cc: Kazumoto Kojima 
Cc: Richard Curnow 
Cc: William Lee Irwin III 
Cc: "David S. Miller" 
Cc: Jeff Dike 
Cc: Paolo 'Blaisorblade' Giarrusso 
Cc: Miles Bader 
Cc: Andi Kleen 
Cc: Chris Zankel 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

atomic_ops.txt has incorrect, misleading and insufficient information [Bug 9020]

2007-10-17T15:42:58+00:00

atomic_ops.txt has incorrect, misleading and insufficient information about
semantics of initializer, atomic_set, atomic_read and atomic_xchg.

It also incorrectly implies that operations mentioned above are not actual
atomic operations.

Included is most of the patch Document non-semantics of atomic_read() and
atomic_set() by Chris Snook, except the word "assignment".

Signed-off-by: Matti Linnanvuori 
Cc: Nick Piggin 
Cc: "Paul E. McKenney" 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

atomic_ops.txt: mention local_t

2007-10-17T15:42:56+00:00

local_t is a variant of atomic_t and has related ops to match.
Add reference for local_t documentation to atomic_ops.txt.

Signed-off-by: Grant Grundler 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

Documentation/atomic_ops.txt typo fix

2007-06-09T00:23:33+00:00

Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

Spelling fixes for Documentation/atomic_ops.txt

2006-06-26T16:27:35+00:00

Spelling and typo fixes for Documentation/atomic_ops.txt

Signed-off-by: Adrian Bunk

[PATCH] atomic: inc_not_zero

2005-11-14T02:14:16+00:00

Introduce an atomic_inc_not_zero operation.  Make this a special case of
atomic_add_unless because lockless pagecache actually wants
atomic_inc_not_negativeone due to its offset refcount.

Signed-off-by: Nick Piggin 
Cc: "Paul E. McKenney" 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

[PATCH] atomic: cmpxchg

2005-11-14T02:14:16+00:00

Introduce an atomic_cmpxchg operation.

Signed-off-by: Nick Piggin 
Cc: "Paul E. McKenney" 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

Linux-2.6.12-rc2

2005-04-16T22:20:36+00:00

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!