diff options
author | Will Deacon <will.deacon@arm.com> | 2011-03-04 12:38:54 +0100 |
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committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2011-03-09 21:40:18 +0000 |
commit | 5dab26af1bacad9a7189d904fbc8b4fe8e95dd81 (patch) | |
tree | 246c70038035ee4a0505f2b043ecb3c73018b01b /Documentation | |
parent | fcbdc5fe6ebe07d502c9b652cb63376bcc4227ac (diff) |
ARM: 6784/1: errata: no automatic Store Buffer drain on Cortex-A9
On revisions of the Cortex-A9 prior to r2p0, the Store Buffer does not
have any automatic draining mechanism and therefore a livelock may occur
if an external agent continuously polls a memory location waiting to
observe an update.
This workaround defines cpu_relax() as smp_mb(), preventing correctly
written polling loops from denying visibility of updates to memory.
Acked-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>
Diffstat (limited to 'Documentation')
0 files changed, 0 insertions, 0 deletions