powerpc/fsl: Fix the flush of branch predictor.

[Michael Ellerman]

On Tue, 2019-02-26 at 18:18:48 UTC, Christophe Leroy wrote:
> The commit identified below adds MC_BTB_FLUSH macro only when
> CONFIG_PPC_FSL_BOOK3E is defined. This results in the following error
> on some configs (seen several times with kisskb randconfig_defconfig)
> 
> arch/powerpc/kernel/exceptions-64e.S:576: Error: Unrecognized opcode: `mc_btb_flush'
> make[3]: *** [scripts/Makefile.build:367: arch/powerpc/kernel/exceptions-64e.o] Error 1
> make[2]: *** [scripts/Makefile.build:492: arch/powerpc/kernel] Error 2
> make[1]: *** [Makefile:1043: arch/powerpc] Error 2
> make: *** [Makefile:152: sub-make] Error 2
> 
> This patch adds a blank definition of MC_BTB_FLUSH for other cases.
> 
> Fixes: 10c5e83afd4a ("powerpc/fsl: Flush the branch predictor at each kernel entry (64bit)")
> Cc: Diana Craciun <diana.craciun at nxp.com>
> Signed-off-by: Christophe Leroy <christophe.leroy at c-s.fr>
> Reviewed-by: Daniel Axtens <dja at axtens.net>
> Reviewed-by: Diana Craciun <diana.craciun at nxp.com>

Applied to powerpc next, thanks.

https://git.kernel.org/powerpc/c/27da80719ef132cf8c80eb406d5aeb37

cheers