linux-kernel - [PATCH 5.0 037/146] powerpc/fsl: Fix the flush of branch predictor.

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Date:   Mon,  1 Apr 2019 19:00:49 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Diana Craciun <diana.craciun@....com>,
        Christophe Leroy <christophe.leroy@....fr>,
        Daniel Axtens <dja@...ens.net>,
        Michael Ellerman <mpe@...erman.id.au>
Subject: [PATCH 5.0 037/146] powerpc/fsl: Fix the flush of branch predictor.

5.0-stable review patch.  If anyone has any objections, please let me know.

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

From: Christophe Leroy <christophe.leroy@....fr>

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/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@....com>
Signed-off-by: Christophe Leroy <christophe.leroy@....fr>
Reviewed-by: Daniel Axtens <dja@...ens.net>
Reviewed-by: Diana Craciun <diana.craciun@....com>
Signed-off-by: Michael Ellerman <mpe@...erman.id.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 arch/powerpc/kernel/exceptions-64e.S |    1 +
 1 file changed, 1 insertion(+)

--- a/arch/powerpc/kernel/exceptions-64e.S
+++ b/arch/powerpc/kernel/exceptions-64e.S
@@ -349,6 +349,7 @@ ret_from_mc_except:
 #define GEN_BTB_FLUSH
 #define CRIT_BTB_FLUSH
 #define DBG_BTB_FLUSH
+#define MC_BTB_FLUSH
 #define GDBELL_BTB_FLUSH
 #endif