13 Sep, 2015
1 commit
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After commit:
654672d4ba1a ("locking/atomics: Add _{acquire|release|relaxed}() variants of some atomic operations")
Architectures may only provide {cmp,}xchg_relaxed definitions in
asm/cmpxchg.h. Other variants, such as {cmp,}xchg, may be built in
linux/atomic.h, which means simply including asm/cmpxchg.h may not get
the definitions of all the{cmp,}xchg variants.Therefore, we should privatize the inclusions of asm/cmpxchg.h to
keep it only included in arch/* and replace the inclusions outside
with linux/atomic.hSigned-off-by: Boqun Feng
Signed-off-by: Peter Zijlstra (Intel)
Acked-by: Greg Kroah-Hartman
Acked-by: Will Deacon
Cc: Andrew Morton
Cc: Aybuke Ozdemir
Cc: Chris Brannon
Cc: Davidlohr Bueso
Cc: Greg Kroah-Hartman
Cc: Jonathan Corbet
Cc: Kirk Reiser
Cc: Kishon Vijay Abraham I
Cc: Linus Torvalds
Cc: Paul E. McKenney
Cc: Peter Zijlstra
Cc: Samuel Thibault
Cc: Shradha Shah
Cc: Thomas Gleixner
Cc: William Hubbs
Cc: devel@driverdev.osuosl.org
Cc: linux-net-drivers@solarflare.com
Cc: speakup@linux-speakup.org
Link: http://lkml.kernel.org/r/1440589966-26280-1-git-send-email-boqun.feng@gmail.com
Signed-off-by: Ingo Molnar
03 Aug, 2015
1 commit
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A failed cmpxchg does not provide any memory ordering guarantees, a
property that is used to optimise the cmpxchg implementations on Alpha,
PowerPC and arm64.This patch updates atomic_ops.txt and memory-barriers.txt to reflect
this.Signed-off-by: Will Deacon
Signed-off-by: Peter Zijlstra (Intel)
Cc: Andrew Morton
Cc: Davidlohr Bueso
Cc: Douglas Hatch
Cc: H. Peter Anvin
Cc: Jonathan Corbet
Cc: Linus Torvalds
Cc: Paul E. McKenney
Cc: Peter Zijlstra
Cc: Scott J Norton
Cc: Thomas Gleixner
Cc: Waiman Long
Link: http://lkml.kernel.org/r/20150716151006.GH26390@arm.com
Signed-off-by: Ingo Molnar
27 Feb, 2015
1 commit
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All value-returning atomic read-modify-write operations must provide full
memory-barrier semantics on both sides of the operation. This commit
clarifies the documentation to make it clear that these memory-barrier
semantics are provided by the operations themselves, not by their callers.Reported-by: Peter Hurley
Signed-off-by: Paul E. McKenney
14 Nov, 2014
1 commit
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Signed-off-by: Paul E. McKenney
Reviewed-by: Pranith Kumar
18 Apr, 2014
1 commit
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Update the documentation to reflect the change of barrier primitives.
Signed-off-by: Peter Zijlstra
Reviewed-by: Paul E. McKenney
Acked-by: David Howells
Link: http://lkml.kernel.org/n/tip-xslfehiga1twbk5uk94rij1e@git.kernel.org
Cc: Linus Torvalds
Cc: Randy Dunlap
Cc: linux-doc@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Ingo Molnar
09 Jan, 2013
1 commit
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Add atomic_xchg() to documentation for atomic operations and
memory barriers.Signed-off-by: Richard Braun
Signed-off-by: Paul E. McKenney
Reviewed-by: Josh Triplett
12 Dec, 2011
1 commit
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An IRC discussion uncovered many conflicting opinions on what types
of data may be atomically loaded and stored. This commit therefore
calls this out the official set: pointers, longs, ints, and chars (but
not shorts). This commit also gives some examples of compiler mischief
that can thwart atomicity.Please note that this discussion is relevant to !SMP kernels if
CONFIG_PREEMPT=y: preemption can cause almost as much trouble as can SMP.Signed-off-by: Paul E. McKenney
Cc: Richard Henderson
Cc: Ivan Kokshaysky
Cc: Matt Turner
Cc: Russell King
Cc: Haavard Skinnemoen
Cc: Hans-Christian Egtvedt
Cc: Mike Frysinger
Cc: Mikael Starvik
Cc: Jesper Nilsson
Cc: David Howells
Cc: Yoshinori Sato
Cc: Richard Kuo
Cc: Jes Sorensen
Cc: Hirokazu Takata
Cc: Geert Uytterhoeven
Cc: Michal Simek
Cc: Ralf Baechle
Cc: Koichi Yasutake
Cc: Jonas Bonn
Cc: Kyle McMartin
Cc: Helge Deller
Cc: "James E.J. Bottomley"
Cc: Benjamin Herrenschmidt
Cc: Paul Mackerras
Cc: Martin Schwidefsky
Cc: Heiko Carstens
Cc: Chen Liqin
Cc: Lennox Wu
Cc: Paul Mundt
Cc: "David S. Miller"
Cc: Chris Metcalf
Cc: Jeff Dike
Cc: Richard Weinberger
Cc: Guan Xuetao
Cc: Thomas Gleixner
Cc: Ingo Molnar
Cc: "H. Peter Anvin"
Cc: Chris Zankel
27 May, 2011
1 commit
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As declaring counter as volatile is discouraged, it is best not to use it
in sample code as well.Signed-off-by: Nikanth Karthikesan
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds
23 Apr, 2010
1 commit
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Fix obvious cases of "it's" being used when "its" was meant.
Signed-off-by: Francis Galiegue
Acked-by: Randy Dunlap
Signed-off-by: Jiri Kosina
17 Jun, 2009
1 commit
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list_add() lost a parameter in sample code.
Signed-off-by: Figo.zhang
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds
24 Feb, 2008
1 commit
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(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
19 Oct, 2007
1 commit
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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
17 Oct, 2007
2 commits
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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 -
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
09 Jun, 2007
1 commit
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Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds
27 Jun, 2006
1 commit
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Spelling and typo fixes for Documentation/atomic_ops.txt
Signed-off-by: Adrian Bunk
14 Nov, 2005
2 commits
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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 -
Introduce an atomic_cmpxchg operation.
Signed-off-by: Nick Piggin
Cc: "Paul E. McKenney"
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds
17 Apr, 2005
1 commit
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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!
