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* [PATCH v2 4/6] x86/fpu: Fix "x86/fpu: Legacy x87 FPU detected" message
  2017-01-18 19:15 [PATCH v2 0/6] CPUID and FPU fixes Andy Lutomirski
@ 2017-01-18 19:15 ` Andy Lutomirski
  0 siblings, 0 replies; 1+ messages in thread
From: Andy Lutomirski @ 2017-01-18 19:15 UTC (permalink / raw)
  To: X86 ML
  Cc: One Thousand Gnomes, Borislav Petkov, linux-kernel, Brian Gerst,
	Matthew Whitehead, Andy Lutomirski

That message isn't at all clear -- what does "Legacy x87" even
mean?

Clarify it.  If there's no FPU, say "x86/fpu: No FPU detected".  If
there's an FPU that doesn't have XSAVE, say "x86/fpu: x87 FPU will use
FSAVE|FXSAVE".

Signed-off-by: Andy Lutomirski <luto@kernel.org>
---
 arch/x86/kernel/fpu/xstate.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/arch/x86/kernel/fpu/xstate.c b/arch/x86/kernel/fpu/xstate.c
index 1d7770447b3e..1691311e5b23 100644
--- a/arch/x86/kernel/fpu/xstate.c
+++ b/arch/x86/kernel/fpu/xstate.c
@@ -705,8 +705,14 @@ void __init fpu__init_system_xstate(void)
 	WARN_ON_FPU(!on_boot_cpu);
 	on_boot_cpu = 0;
 
+	if (!boot_cpu_has(X86_FEATURE_FPU)) {
+		pr_info("x86/fpu: No FPU detected.\n");
+		return;
+	}
+
 	if (!boot_cpu_has(X86_FEATURE_XSAVE)) {
-		pr_info("x86/fpu: Legacy x87 FPU detected.\n");
+		pr_info("x86/fpu: x87 FPU will use %s.\n",
+			boot_cpu_has(X86_FEATURE_FXSR) ? "FXSAVE" : "FSAVE");
 		return;
 	}
 
-- 
2.9.3

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2017-01-18 19:15 [PATCH v2 0/6] CPUID and FPU fixes Andy Lutomirski
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