From: Max Filippov jcmvbkbc@gmail.com
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@vger.kernel.org Signed-off-by: Max Filippov jcmvbkbc@gmail.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- arch/xtensa/kernel/setup.c | 1 + 1 file changed, 1 insertion(+)
--- a/arch/xtensa/kernel/setup.c +++ b/arch/xtensa/kernel/setup.c @@ -508,6 +508,7 @@ 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"