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x86/fpu: Improve FPU detection kernel messages

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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>
This commit is contained in:
Ingo Molnar 2015-04-24 03:25:18 +02:00
parent 7b302e6731
commit 32d4d9ccb0
1 changed files with 14 additions and 12 deletions
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26
arch/x86/kernel/fpu/xsave.c
View File

@ -3,9 +3,6 @@
*
* Author: Suresh Siddha <suresh.b.siddha@intel.com>
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/bootmem.h>
#include <linux/compat.h>
#include <linux/cpu.h>
@ -615,7 +612,7 @@ static void /* __init */ xstate_enable_boot_cpu(void)
unsigned int eax, ebx, ecx, edx;
if (boot_cpu_data.cpuid_level < XSTATE_CPUID) {
WARN(1, KERN_ERR "XSTATE_CPUID missing\n");
WARN(1, "x86/fpu: XSTATE_CPUID missing!\n");
return;
}
@ -623,8 +620,7 @@ static void /* __init */ xstate_enable_boot_cpu(void)
pcntxt_mask = eax + ((u64)edx << 32);
if ((pcntxt_mask & XSTATE_FPSSE) != XSTATE_FPSSE) {
pr_err("FP/SSE not shown under xsave features 0x%llx\n",
pcntxt_mask);
pr_err("x86/fpu: FP/SSE not present amongst the CPU's xstate features: 0x%llx.\n", pcntxt_mask);
BUG();
}
@ -650,17 +646,18 @@ static void /* __init */ xstate_enable_boot_cpu(void)
if (pcntxt_mask & XSTATE_EAGER) {
if (eagerfpu == DISABLE) {
pr_err("eagerfpu not present, disabling some xstate features: 0x%llx\n",
pcntxt_mask & XSTATE_EAGER);
pr_err("x86/fpu: eagerfpu switching disabled, disabling the following xstate features: 0x%llx.\n",
pcntxt_mask & XSTATE_EAGER);
pcntxt_mask &= ~XSTATE_EAGER;
} else {
eagerfpu = ENABLE;
}
}
pr_info("enabled xstate_bv 0x%llx, cntxt size 0x%x using %s\n",
pcntxt_mask, xstate_size,
cpu_has_xsaves ? "compacted form" : "standard form");
pr_info("x86/fpu: Enabled xstate features 0x%llx, context size is 0x%x bytes, using '%s' format.\n",
pcntxt_mask,
xstate_size,
cpu_has_xsaves ? "compacted" : "standard");
}
/*
@ -671,8 +668,13 @@ void xsave_init(void)
{
static char on_boot_cpu = 1;
if (!cpu_has_xsave)
if (!cpu_has_xsave) {
if (on_boot_cpu) {
on_boot_cpu = 0;
pr_info("x86/fpu: Legacy x87 FPU detected.\n");
}
return;
}
if (on_boot_cpu) {
on_boot_cpu = 0;