On Fri, Jun 21, 2013 at 05:31:04PM +0200, Gregory CLEMENT wrote:
> This commit fixes the regression on Armada 370 (the kernal hang during
> boot) introduced by the commit: "ARM: 7691/1: mm: kill unused
> TLB_CAN_READ_FROM_L1_CACHE and use ALT_SMP instead".
>
> When coming out of either a Wait for Interrupt (WFI) or a Wait for
> Event (WFE) IDLE states, a specific timing sensitivity exists between
> the retiring WFI/WFE instructions and the newly issued subsequent
> instructions. This sensitivity can result in a CPU hang scenario. The
> workaround is to insert either a Data Synchronization Barrier (DSB) or
> Data Memory Barrier (DMB) command immediately after the WFI/WFE
> instruction.
>
> This commit was based on the work of Lior Amsalem, but heavily
> modified to apply the errata fix dynamically according to the
> processor type thanks to the suggestions of Russell King and Nicolas
> Pitre.
>
> Signed-off-by: Gregory CLEMENT <gregory.clement@xxxxxxxxxxxxxxxxxx>
> Reviewed-by: Will Deacon <will.deacon@xxxxxxx>
> Cc: <stable@xxxxxxxxxxxxxxx>
Works fine here, kudos Greg! Feel free to add my Tested-by if you
want :
Tested-By: Willy Tarreau <w@xxxxxx>
Best regards,
Willy
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