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powerpc/security: Allow for processors that flush the link stack usin…
…g the special bcctr If both count cache and link stack are to be flushed, and can be flushed with the special bcctr, patch that in directly to the flush/branch nop site. Signed-off-by: Nicholas Piggin <npiggin@gmail.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20200609070610.846703-7-npiggin@gmail.com
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