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Processors with coherent icache require the sequence sync ; icbi ; isync
to entire store->execute coherency. icbi (to any address) must be
executed to ensure isync flushes the pipeline. See "POWER9 Processor
User's Manual, 4.6.2.2 Instruction Cache Block Invalidate (icbi)" for
details.
__kernel_sync_dicache is missing icbi for the coherent icache path.
Add it.
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20220520123649.258440-1-npiggin@gmail.com
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