[PATCH] arm64: mte: fix prctl(PR_GET_TAGGED_ADDR_CTRL) if TCF0=NONE

[Peter Collingbourne]

Previously we were always returning a tag inclusion mask of zero via
PR_GET_TAGGED_ADDR_CTRL if TCF0 was set to NONE. Fix it by making
the code for the NONE case match the others.

Signed-off-by: Peter Collingbourne <pcc at google.com>
Link: https://linux-review.googlesource.com/id/Iefbea66cf7d2b4c80b82f9639b9ea7f33f7fac53
---
 arch/arm64/kernel/mte.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/arch/arm64/kernel/mte.c b/arch/arm64/kernel/mte.c
index 52a0638ed967..ef15c8a2a49d 100644
--- a/arch/arm64/kernel/mte.c
+++ b/arch/arm64/kernel/mte.c
@@ -189,7 +189,8 @@ long get_mte_ctrl(struct task_struct *task)
 
 	switch (task->thread.sctlr_tcf0) {
 	case SCTLR_EL1_TCF0_NONE:
-		return PR_MTE_TCF_NONE;
+		ret |= PR_MTE_TCF_NONE;
+		break;
 	case SCTLR_EL1_TCF0_SYNC:
 		ret |= PR_MTE_TCF_SYNC;
 		break;
-- 
2.29.2.454.gaff20da3a2-goog