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x86/fpu: Improve FPU detection kernel messages
Standardize the various boot time messages printed during FPU detection: - Use a common 'x86/fpu: ' prefix for consistency and to make it easy to grep boot logs for FPU related messages - Correct speling errors - Add printout for the legacy FPU case as well - Clarify messages Reviewed-by: Borislav Petkov <bp@alien8.de> Cc: Andy Lutomirski <luto@amacapital.net> Cc: Dave Hansen <dave.hansen@linux.intel.com> Cc: Fenghua Yu <fenghua.yu@intel.com> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Oleg Nesterov <oleg@redhat.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Ingo Molnar <mingo@kernel.org>
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@ -3,9 +3,6 @@
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*
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* Author: Suresh Siddha <suresh.b.siddha@intel.com>
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/bootmem.h>
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#include <linux/compat.h>
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#include <linux/cpu.h>
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@ -615,7 +612,7 @@ static void /* __init */ xstate_enable_boot_cpu(void)
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unsigned int eax, ebx, ecx, edx;
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if (boot_cpu_data.cpuid_level < XSTATE_CPUID) {
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WARN(1, KERN_ERR "XSTATE_CPUID missing\n");
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WARN(1, "x86/fpu: XSTATE_CPUID missing!\n");
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return;
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}
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@ -623,8 +620,7 @@ static void /* __init */ xstate_enable_boot_cpu(void)
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pcntxt_mask = eax + ((u64)edx << 32);
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if ((pcntxt_mask & XSTATE_FPSSE) != XSTATE_FPSSE) {
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pr_err("FP/SSE not shown under xsave features 0x%llx\n",
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pcntxt_mask);
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pr_err("x86/fpu: FP/SSE not present amongst the CPU's xstate features: 0x%llx.\n", pcntxt_mask);
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BUG();
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}
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@ -650,17 +646,18 @@ static void /* __init */ xstate_enable_boot_cpu(void)
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if (pcntxt_mask & XSTATE_EAGER) {
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if (eagerfpu == DISABLE) {
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pr_err("eagerfpu not present, disabling some xstate features: 0x%llx\n",
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pcntxt_mask & XSTATE_EAGER);
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pr_err("x86/fpu: eagerfpu switching disabled, disabling the following xstate features: 0x%llx.\n",
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pcntxt_mask & XSTATE_EAGER);
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pcntxt_mask &= ~XSTATE_EAGER;
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} else {
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eagerfpu = ENABLE;
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}
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}
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pr_info("enabled xstate_bv 0x%llx, cntxt size 0x%x using %s\n",
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pcntxt_mask, xstate_size,
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cpu_has_xsaves ? "compacted form" : "standard form");
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pr_info("x86/fpu: Enabled xstate features 0x%llx, context size is 0x%x bytes, using '%s' format.\n",
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pcntxt_mask,
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xstate_size,
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cpu_has_xsaves ? "compacted" : "standard");
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}
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/*
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@ -671,8 +668,13 @@ void xsave_init(void)
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{
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static char on_boot_cpu = 1;
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if (!cpu_has_xsave)
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if (!cpu_has_xsave) {
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if (on_boot_cpu) {
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on_boot_cpu = 0;
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pr_info("x86/fpu: Legacy x87 FPU detected.\n");
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}
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return;
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}
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if (on_boot_cpu) {
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on_boot_cpu = 0;
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