Commit-ID: 32d4d9ccb0f3209425d6e8aefa484bf00a5dc183
Gitweb: http://git.kernel.org/tip/32d4d9ccb0f3209425d6e8aefa484bf00a5dc183
Author: Ingo Molnar <mingo@xxxxxxxxxx>
AuthorDate: Fri, 24 Apr 2015 03:25:18 +0200
Committer: Ingo Molnar <mingo@xxxxxxxxxx>
CommitDate: Tue, 19 May 2015 15:47:32 +0200
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@xxxxxxxxx>
Cc: Andy Lutomirski <luto@xxxxxxxxxxxxxx>
Cc: Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>
Cc: Fenghua Yu <fenghua.yu@xxxxxxxxx>
Cc: H. Peter Anvin <hpa@xxxxxxxxx>
Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Cc: Oleg Nesterov <oleg@xxxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx>
---
arch/x86/kernel/fpu/xsave.c | 26 ++++++++++++++------------
1 file changed, 14 insertions(+), 12 deletions(-)
diff --git a/arch/x86/kernel/fpu/xsave.c b/arch/x86/kernel/fpu/xsave.c
index 6c1cbb2..bfe92f7 100644
--- a/arch/x86/kernel/fpu/xsave.c
+++ b/arch/x86/kernel/fpu/xsave.c
@@ -3,9 +3,6 @@
*
* Author: Suresh Siddha <suresh.b.siddha@xxxxxxxxx>
*/
-
-#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;
--
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