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arm64: cpufeature: Don't dump useless backtrace on CPU_OUT_OF_SPEC

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Unfortunately, it turns out that mismatched CPU features in big.LITTLE
systems are starting to appear in the wild. Whilst we should continue to
taint the kernel with CPU_OUT_OF_SPEC for features that differ in ways
that we can't fix up, dumping a useless backtrace out of the cpufeature
code is pointless and irritating.

This patch removes the backtrace from the taint.

Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
This commit is contained in:
Will Deacon 2017-05-18 16:10:34 +01:00
parent 6efd8499d9
commit 3fde2999fa
1 changed files with 2 additions and 2 deletions
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4
arch/arm64/kernel/cpufeature.c
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@ -639,8 +639,8 @@ void update_cpu_features(int cpu,
* Mismatched CPU features are a recipe for disaster. Don't even
* pretend to support them.
*/
WARN_TAINT_ONCE(taint, TAINT_CPU_OUT_OF_SPEC,
"Unsupported CPU feature variation.\n");
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)