[PATCH 4.9 058/103] xtensa: add missing isync to the cpu_reset TLB code

[Greg Kroah-Hartman]

From: Max Filippov <jcmvbkbc@xxxxxxxxx>

commit cd8869f4cb257f22b89495ca40f5281e58ba359c upstream.

ITLB entry modifications must be followed by the isync instruction
before the new entries are possibly used. cpu_reset lacks one isync
between ITLB way 6 initialization and jump to the identity mapping.
Add missing isync to xtensa cpu_reset.

Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Max Filippov <jcmvbkbc@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
 arch/xtensa/kernel/setup.c |    1 +
 1 file changed, 1 insertion(+)

--- a/arch/xtensa/kernel/setup.c
+++ b/arch/xtensa/kernel/setup.c
@@ -626,6 +626,7 @@ void cpu_reset(void)
 				      "add	%2, %2, %7\n\t"
 				      "addi	%0, %0, -1\n\t"
 				      "bnez	%0, 1b\n\t"
+				      "isync\n\t"
 				      /* Jump to identity mapping */
 				      "jx	%3\n"
 				      "2:\n\t"