| From cd8869f4cb257f22b89495ca40f5281e58ba359c Mon Sep 17 00:00:00 2001 |
| From: Max Filippov <jcmvbkbc@gmail.com> |
| Date: Mon, 12 Aug 2019 15:01:30 -0700 |
| Subject: xtensa: add missing isync to the cpu_reset TLB code |
| |
| 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 |
| @@ -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" |
