[PATCH v2 1/2] arm64: add an MTE support check to the top of mte_thread_switch()
flat view
STALE1857d
From: Peter Collingbourne <hidden>
Date: 2021-09-14 21:56:35
Subsystem:
arm64 port (aarch64 architecture), the rest · Maintainers:
Catalin Marinas, Will Deacon, Linus Torvalds
This lets us avoid doing unnecessary work on hardware that does not support MTE, and will allow us to freely use MTE instructions in the code called by mte_thread_switch(). Signed-off-by: Peter Collingbourne <redacted> Link: https://linux-review.googlesource.com/id/I02fd000d1ef2c86c7d2952a7f099b254ec227a5d --- arch/arm64/kernel/mte.c | 3 +++ 1 file changed, 3 insertions(+)
diff --git a/arch/arm64/kernel/mte.c b/arch/arm64/kernel/mte.c
index 9d314a3bad3b..8fc2d90eeb00 100644
--- a/arch/arm64/kernel/mte.c
+++ b/arch/arm64/kernel/mte.c@@ -199,6 +199,9 @@ void mte_thread_init_user(void) void mte_thread_switch(struct task_struct *next) { + if (!system_supports_mte()) + return; + mte_update_sctlr_user(next); /*
--
2.33.0.309.g3052b89438-goog
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