[PATCH stable 4.9 13/23] powerpc/64s: Move cpu_show_meltdown()

[Michael Ellerman]

commit 8ad33041563a10b34988800c682ada14b2612533 upstream.

This landed in setup_64.c for no good reason other than we had nowhere
else to put it. Now that we have a security-related file, that is a
better place for it so move it.

[mpe: Add extern for rfi_flush to fix bisection break]
Signed-off-by: Michael Ellerman <mpe at ellerman.id.au>
---
 arch/powerpc/include/asm/security_features.h |  1 +
 arch/powerpc/kernel/security.c               | 11 +++++++++++
 arch/powerpc/kernel/setup_64.c               |  8 --------
 3 files changed, 12 insertions(+), 8 deletions(-)

diff --git a/arch/powerpc/include/asm/security_features.h b/arch/powerpc/include/asm/security_features.h
index db00ad2c72c2..400a9050e035 100644
--- a/arch/powerpc/include/asm/security_features.h
+++ b/arch/powerpc/include/asm/security_features.h
@@ -10,6 +10,7 @@
 
 
 extern unsigned long powerpc_security_features;
+extern bool rfi_flush;
 
 static inline void security_ftr_set(unsigned long feature)
 {
diff --git a/arch/powerpc/kernel/security.c b/arch/powerpc/kernel/security.c
index 4ccba00d224c..564e7f182a16 100644
--- a/arch/powerpc/kernel/security.c
+++ b/arch/powerpc/kernel/security.c
@@ -5,6 +5,8 @@
 // Copyright 2018, Michael Ellerman, IBM Corporation.
 
 #include <linux/kernel.h>
+#include <linux/device.h>
+
 #include <asm/security_features.h>
 
 
@@ -13,3 +15,12 @@ unsigned long powerpc_security_features __read_mostly = \
 	SEC_FTR_L1D_FLUSH_PR | \
 	SEC_FTR_BNDS_CHK_SPEC_BAR | \
 	SEC_FTR_FAVOUR_SECURITY;
+
+
+ssize_t cpu_show_meltdown(struct device *dev, struct device_attribute *attr, char *buf)
+{
+	if (rfi_flush)
+		return sprintf(buf, "Mitigation: RFI Flush\n");
+
+	return sprintf(buf, "Vulnerable\n");
+}
diff --git a/arch/powerpc/kernel/setup_64.c b/arch/powerpc/kernel/setup_64.c
index eaa6039edddc..eda7eefe4927 100644
--- a/arch/powerpc/kernel/setup_64.c
+++ b/arch/powerpc/kernel/setup_64.c
@@ -805,12 +805,4 @@ static __init int rfi_flush_debugfs_init(void)
 }
 device_initcall(rfi_flush_debugfs_init);
 #endif
-
-ssize_t cpu_show_meltdown(struct device *dev, struct device_attribute *attr, char *buf)
-{
-	if (rfi_flush)
-		return sprintf(buf, "Mitigation: RFI Flush\n");
-
-	return sprintf(buf, "Vulnerable\n");
-}
 #endif /* CONFIG_PPC_BOOK3S_64 */
-- 
2.14.1