ARM: 6389/1: errata: incorrect hazard handling in the SCU may lead to data corruption
commita672e99b129e286df2e2697a1b603d82321117f3
authorWill Deacon <will.deacon@arm.com>
Tue, 14 Sep 2010 08:53:02 +0000 (14 09:53 +0100)
committerRussell King <rmk+kernel@arm.linux.org.uk>
Fri, 17 Sep 2010 09:16:52 +0000 (17 10:16 +0100)
tree3307cdb68df62a67d78309ecdf6c35cab7321892
parent9f05027c7cb3cfe56a31892bd83391138d41a667
ARM: 6389/1: errata: incorrect hazard handling in the SCU may lead to data corruption

On the r2p0, r2p1 and r2p2 versions of the Cortex-A9, data corruption
can occur if a shared cache line is replaced on one CPU as another CPU
is accessing it.

This workaround sets two bits in the diagnostic register of the Cortex-A9,
reducing the linefill issuing capabilities of the processor and
avoiding the erroneous behaviour.

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>
arch/arm/Kconfig
arch/arm/mm/proc-v7.S