Chris Metcalf df29ccb6c0 arch/tile: allow nonatomic stores to interoperate with fast atomic syscalls ... This semantic was already true for atomic operations within the kernel, and this change makes it true for the fast atomic syscalls (__NR_cmpxchg and __NR_atomic_update) as well. Previously, user-space had to use the fast atomic syscalls exclusively to update memory, since raw stores could lose a race with the atomic update code even when the atomic update hadn't actually modified the value. With this change, we no longer write back the value to memory if it hasn't changed. This allows certain types of idioms in user space to work as expected, e.g. "atomic exchange" to acquire a spinlock, followed by a raw store of zero to release the lock. Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>		2011-05-04 14:40:07 -04:00
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configs	kconfig: rename CONFIG_EMBEDDED to CONFIG_EXPERT	2011-01-20 17:02:05 -08:00
include	arch/tile: improve support for PCI hotplug	2011-05-04 14:39:53 -04:00
kernel	arch/tile: allow nonatomic stores to interoperate with fast atomic syscalls	2011-05-04 14:40:07 -04:00
kvm	arch/tile: parameterize system PLs to support KVM port	2010-10-15 15:38:09 -04:00
lib	arch/tile: allow nonatomic stores to interoperate with fast atomic syscalls	2011-05-04 14:40:07 -04:00
mm	arch/tile: support TIF_NOTIFY_RESUME	2011-05-02 18:53:35 -04:00
Kbuild	arch/tile: core support for Tilera 32-bit chips.	2010-06-04 17:11:18 -04:00
Kconfig	arch/tile: improve support for PCI hotplug	2011-05-04 14:39:53 -04:00
Kconfig.debug	kconfig: rename CONFIG_EMBEDDED to CONFIG_EXPERT	2011-01-20 17:02:05 -08:00
Makefile	arch/tile: parameterize system PLs to support KVM port	2010-10-15 15:38:09 -04:00