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authorSuresh Siddha <suresh.b.siddha@intel.com>2011-06-30 17:19:32 -0700
committerH. Peter Anvin <hpa@linux.intel.com>2011-06-30 17:29:47 -0700
commit3e7cf5b00dd5b577b4ee9b2a66e40fb670ef210b (patch)
treef49eaaae16aee9f36fe85384fa3e8c8feeb997ab /arch/x86/kernel/cpu/bugs.c
parentb0af8dfdd67699e25083478c63eedef2e72ebd85 (diff)
x86-32, fpu: Fix DNA exception during check_fpu()
Before check_fpu() is called, we have cr0.TS bit set and hence the floating point code to check the FDIV bug was generating a DNA exception. Use kernel_fpu_begin()/kernel_fpu_end() around the floating point code to avoid this unnecessary device not available exception during boot. Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com> Link: http://lkml.kernel.org/r/1309479572.2665.1372.camel@sbsiddha-MOBL3.sc.intel.com Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
Diffstat (limited to 'arch/x86/kernel/cpu/bugs.c')
-rw-r--r--arch/x86/kernel/cpu/bugs.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/arch/x86/kernel/cpu/bugs.c b/arch/x86/kernel/cpu/bugs.c
index 525514cf33c3..46674fbb62ba 100644
--- a/arch/x86/kernel/cpu/bugs.c
+++ b/arch/x86/kernel/cpu/bugs.c
@@ -62,6 +62,8 @@ static void __init check_fpu(void)
return;
}
+ kernel_fpu_begin();
+
/*
* trap_init() enabled FXSR and company _before_ testing for FP
* problems here.
@@ -80,6 +82,8 @@ static void __init check_fpu(void)
: "=m" (*&fdiv_bug)
: "m" (*&x), "m" (*&y));
+ kernel_fpu_end();
+
boot_cpu_data.fdiv_bug = fdiv_bug;
if (boot_cpu_data.fdiv_bug)
printk(KERN_WARNING "Hmm, FPU with FDIV bug.\n");