diff options
| author | Suresh Siddha <suresh.b.siddha@intel.com> | 2012-09-06 15:05:18 -0700 |
|---|---|---|
| committer | H. Peter Anvin <hpa@linux.intel.com> | 2012-09-18 15:52:23 -0700 |
| commit | 212b02125f3725127148475059a70031bd031bdb (patch) | |
| tree | 9505ae1f2d35ee9c803c0d3e64451b41db9ccb8b /arch/x86/kernel | |
| parent | 5d2bd7009f306c82afddd1ca4d9763ad8473c216 (diff) | |
x86, fpu: enable eagerfpu by default for xsaveopt
xsaveopt/xrstor support optimized state save/restore by tracking the
INIT state and MODIFIED state during context-switch.
Enable eagerfpu by default for processors supporting xsaveopt.
Can be disabled by passing "eagerfpu=off" boot parameter.
Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com>
Link: http://lkml.kernel.org/r/1347300665-6209-3-git-send-email-suresh.b.siddha@intel.com
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
Diffstat (limited to 'arch/x86/kernel')
| -rw-r--r-- | arch/x86/kernel/xsave.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/arch/x86/kernel/xsave.c b/arch/x86/kernel/xsave.c index c0afd2c4376..e99f75439f6 100644 --- a/arch/x86/kernel/xsave.c +++ b/arch/x86/kernel/xsave.c @@ -557,6 +557,9 @@ static void __init xstate_enable_boot_cpu(void) prepare_fx_sw_frame(); setup_init_fpu_buf(); + if (cpu_has_xsaveopt && !disable_eagerfpu) + setup_force_cpu_cap(X86_FEATURE_EAGER_FPU); + pr_info("enabled xstate_bv 0x%llx, cntxt size 0x%x\n", pcntxt_mask, xstate_size); } |