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 @@ -515,6 +515,7 @@ 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"
