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Subject[PATCH 4.19 034/134] powerpc/fsl: Add macro to flush the branch predictor
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4.19-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Diana Craciun <diana.craciun@nxp.com>

commit 1cbf8990d79ff69da8ad09e8a3df014e1494462b upstream.

The BUCSR register can be used to invalidate the entries in the
branch prediction mechanisms.

Signed-off-by: Diana Craciun <diana.craciun@nxp.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
arch/powerpc/include/asm/ppc_asm.h | 10 ++++++++++
1 file changed, 10 insertions(+)

--- a/arch/powerpc/include/asm/ppc_asm.h
+++ b/arch/powerpc/include/asm/ppc_asm.h
@@ -821,4 +821,14 @@ END_FTR_SECTION_IFCLR(CPU_FTR_601)
stringify_in_c(.long (_target) - . ;) \
stringify_in_c(.previous)

+#ifdef CONFIG_PPC_FSL_BOOK3E
+#define BTB_FLUSH(reg) \
+ lis reg,BUCSR_INIT@h; \
+ ori reg,reg,BUCSR_INIT@l; \
+ mtspr SPRN_BUCSR,reg; \
+ isync;
+#else
+#define BTB_FLUSH(reg)
+#endif /* CONFIG_PPC_FSL_BOOK3E */
+
#endif /* _ASM_POWERPC_PPC_ASM_H */

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