From: Will Deacon Date: Thu, 18 May 2017 15:10:34 +0000 (+0100) Subject: arm64: cpufeature: Don't dump useless backtrace on CPU_OUT_OF_SPEC X-Git-Tag: v4.13-rc1~147^2~54 X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=3fde2999fac5;p=karo-tx-linux.git arm64: cpufeature: Don't dump useless backtrace on CPU_OUT_OF_SPEC 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 Signed-off-by: Will Deacon --- diff --git a/arch/arm64/kernel/cpufeature.c b/arch/arm64/kernel/cpufeature.c index 817ce3365e20..22f554320581 100644 --- a/arch/arm64/kernel/cpufeature.c +++ b/arch/arm64/kernel/cpufeature.c @@ -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)