Commit 8dd0ee65 authored by Will Deacon's avatar Will Deacon

arm64: cpufeature: Fix CPU_OUT_OF_SPEC taint for uniform systems

Commit 3fde2999 ("arm64: cpufeature: Don't dump useless backtrace on
CPU_OUT_OF_SPEC") changed the cpufeature detection code to use add_taint
instead of WARN_TAINT_ONCE when detecting a heterogeneous system with
mismatched feature support. Unfortunately, this resulted in all systems
getting the taint, regardless of any feature mismatch.

This patch fixes the problem by conditionalising the taint on detecting
a feature mismatch.
Acked-by: default avatarMark Rutland <mark.rutland@arm.com>
Reported-by: default avatarHeiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: default avatarWill Deacon <will.deacon@arm.com>
parent 1151f838
......@@ -639,8 +639,10 @@ void update_cpu_features(int cpu,
* Mismatched CPU features are a recipe for disaster. Don't even
* pretend to support them.
*/
if (taint) {
pr_warn_once("Unsupported CPU feature variation detected.\n");
add_taint(TAINT_CPU_OUT_OF_SPEC, LOCKDEP_STILL_OK);
}
}
u64 read_sanitised_ftr_reg(u32 id)
......
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