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Date:   Mon, 15 Apr 2019 20:44:07 +0200
From:   Greg Kroah-Hartman <>
Cc:     Greg Kroah-Hartman <>,, Diana Craciun <>,
        Christophe Leroy <>,
        Daniel Axtens <>,
        Michael Ellerman <>,
        Sasha Levin <>
Subject: [PATCH 4.9 43/76] powerpc/fsl: Fix the flush of branch predictor.

commit 27da80719ef132cf8c80eb406d5aeb37dddf78cc upstream.

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/ arch/powerpc/kernel/exceptions-64e.o] Error 1
make[2]: *** [scripts/ 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 <>
Signed-off-by: Christophe Leroy <>
Reviewed-by: Daniel Axtens <>
Reviewed-by: Diana Craciun <>
Signed-off-by: Michael Ellerman <>
Signed-off-by: Sasha Levin <>
 arch/powerpc/kernel/exceptions-64e.S | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/powerpc/kernel/exceptions-64e.S b/arch/powerpc/kernel/exceptions-64e.S
index 79c6fee6368d..423b5257d3a1 100644
--- a/arch/powerpc/kernel/exceptions-64e.S
+++ b/arch/powerpc/kernel/exceptions-64e.S
@@ -348,6 +348,7 @@ ret_from_mc_except:
 #define GEN_BTB_FLUSH
 #define DBG_BTB_FLUSH
+#define MC_BTB_FLUSH

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