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ARM: 7687/1: atomics: don't use exclusives for atomic64 read/set with LPAE
authorWill Deacon <will.deacon@arm.com>
Thu, 28 Mar 2013 10:25:03 +0000 (11:25 +0100)
committerRussell King <rmk+kernel@arm.linux.org.uk>
Wed, 3 Apr 2013 16:00:00 +0000 (17:00 +0100)
commit4fd75911f6970478444eece952dacb2db9d1e5a5
tree310800b1a6ad447f697f1dccd12d3e6cf11179cftree | snapshot (tar.gz zip)
parent029baf14a027a44b3ac8a9fe5cb1e516cbb9007ecommit | diff
ARM: 7687/1: atomics: don't use exclusives for atomic64 read/set with LPAE

To ease page table updates with 64-bit descriptors, CPUs implementing
LPAE are required to implement ldrd/strd as atomic operations.

This patch uses these accessors instead of the exclusive variants when
performing atomic64_{read,set} on LPAE systems.

Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
arch/arm/include/asm/atomic.h diff | blob | blame | history