diff options
| author |   Will Deacon <will.deacon@arm.com> | 2017-06-05 11:40:23 +0100 |
|---|---|---|
| committer | Will Deacon <will.deacon@arm.com> | 2017-06-05 11:40:23 +0100 |
| commit | 8dd0ee651d8aefdc2d8ae0fcc9c68dfc943c9e4c (patch) | |
| tree | 4433eaf6241c70a08e09a8f9d766f67d3867acb5 /arch/arm64/kernel/cpufeature.c | |
| parent | arm64: kernel: restrict /dev/mem read() calls to linear region (diff) | |
| download | linux-dev-8dd0ee651d8aefdc2d8ae0fcc9c68dfc943c9e4c.tar.xz linux-dev-8dd0ee651d8aefdc2d8ae0fcc9c68dfc943c9e4c.zip | |
arm64: cpufeature: Fix CPU_OUT_OF_SPEC taint for uniform systems
Commit 3fde2999fac5 ("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: Mark Rutland <mark.rutland@arm.com>
Reported-by: Heiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Diffstat (limited to '')
| -rw-r--r-- | arch/arm64/kernel/cpufeature.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/arch/arm64/kernel/cpufeature.c b/arch/arm64/kernel/cpufeature.c index 22f554320581..55d5c72a507d 100644 --- a/arch/arm64/kernel/cpufeature.c +++ b/arch/arm64/kernel/cpufeature.c @@ -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. */ - pr_warn_once("Unsupported CPU feature variation detected.\n"); - add_taint(TAINT_CPU_OUT_OF_SPEC, LOCKDEP_STILL_OK); + 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) |