Commit-ID: 84567995612258c23bc55795575babe7ef605dd9 Gitweb: http://git.kernel.org/tip/84567995612258c23bc55795575babe7ef605dd9 Author: Boqun Feng <boqun.f...@gmail.com> AuthorDate: Wed, 26 Aug 2015 19:52:46 +0800 Committer: Ingo Molnar <mi...@kernel.org> CommitDate: Sun, 13 Sep 2015 10:35:46 +0200
locking/atomics, cmpxchg: Privatize the inclusion of asm/cmpxchg.h 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.h Signed-off-by: Boqun Feng <boqun.f...@gmail.com> Signed-off-by: Peter Zijlstra (Intel) <pet...@infradead.org> Acked-by: Greg Kroah-Hartman <gre...@linuxfoundation.org> Acked-by: Will Deacon <will.dea...@arm.com> Cc: Andrew Morton <a...@linux-foundation.org> Cc: Aybuke Ozdemir <aybuke....@gmail.com> Cc: Chris Brannon <ch...@the-brannons.com> Cc: Davidlohr Bueso <d...@stgolabs.net> Cc: Greg Kroah-Hartman <gre...@linuxfoundation.org> Cc: Jonathan Corbet <cor...@lwn.net> Cc: Kirk Reiser <k...@reisers.ca> Cc: Kishon Vijay Abraham I <kis...@ti.com> Cc: Linus Torvalds <torva...@linux-foundation.org> Cc: Paul E. McKenney <paul...@linux.vnet.ibm.com> Cc: Peter Zijlstra <pet...@infradead.org> Cc: Samuel Thibault <samuel.thiba...@ens-lyon.org> Cc: Shradha Shah <ss...@solarflare.com> Cc: Thomas Gleixner <t...@linutronix.de> Cc: William Hubbs <w.d.hu...@gmail.com> Cc: de...@driverdev.osuosl.org Cc: linux-net-driv...@solarflare.com Cc: spea...@linux-speakup.org Link: http://lkml.kernel.org/r/1440589966-26280-1-git-send-email-boqun.f...@gmail.com Signed-off-by: Ingo Molnar <mi...@kernel.org> --- Documentation/atomic_ops.txt | 4 ++++ drivers/net/ethernet/sfc/mcdi.c | 2 +- drivers/phy/phy-rcar-gen2.c | 3 +-- drivers/staging/speakup/selection.c | 2 +- 4 files changed, 7 insertions(+), 4 deletions(-) diff --git a/Documentation/atomic_ops.txt b/Documentation/atomic_ops.txt index b19fc34..c9d1cac 100644 --- a/Documentation/atomic_ops.txt +++ b/Documentation/atomic_ops.txt @@ -542,6 +542,10 @@ The routines xchg() and cmpxchg() must provide the same exact memory-barrier semantics as the atomic and bit operations returning values. +Note: If someone wants to use xchg(), cmpxchg() and their variants, +linux/atomic.h should be included rather than asm/cmpxchg.h, unless +the code is in arch/* and can take care of itself. + Spinlocks and rwlocks have memory barrier expectations as well. The rule to follow is simple: diff --git a/drivers/net/ethernet/sfc/mcdi.c b/drivers/net/ethernet/sfc/mcdi.c index 98d172b..a9b9460 100644 --- a/drivers/net/ethernet/sfc/mcdi.c +++ b/drivers/net/ethernet/sfc/mcdi.c @@ -9,7 +9,7 @@ #include <linux/delay.h> #include <linux/moduleparam.h> -#include <asm/cmpxchg.h> +#include <linux/atomic.h> #include "net_driver.h" #include "nic.h" #include "io.h" diff --git a/drivers/phy/phy-rcar-gen2.c b/drivers/phy/phy-rcar-gen2.c index 6e0d9fa..c7a0599 100644 --- a/drivers/phy/phy-rcar-gen2.c +++ b/drivers/phy/phy-rcar-gen2.c @@ -17,8 +17,7 @@ #include <linux/phy/phy.h> #include <linux/platform_device.h> #include <linux/spinlock.h> - -#include <asm/cmpxchg.h> +#include <linux/atomic.h> #define USBHS_LPSTS 0x02 #define USBHS_UGCTRL 0x80 diff --git a/drivers/staging/speakup/selection.c b/drivers/staging/speakup/selection.c index 98af3b1..aa5ab6c 100644 --- a/drivers/staging/speakup/selection.c +++ b/drivers/staging/speakup/selection.c @@ -7,7 +7,7 @@ #include <linux/workqueue.h> #include <linux/tty.h> #include <linux/tty_flip.h> -#include <asm/cmpxchg.h> +#include <linux/atomic.h> #include "speakup.h" -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/