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authorSuresh Siddha <suresh.b.siddha@intel.com>2012-09-07 01:58:52 +0400
committerH. Peter Anvin <hpa@linux.intel.com>2012-09-19 02:52:22 +0400
commit5d2bd7009f306c82afddd1ca4d9763ad8473c216 (patch)
tree772bc888c48766b892e216c19e938c82657e2b0e /Documentation/kernel-parameters.txt
parent304bceda6a18ae0b0240b8aac9a6bdf8ce2d2469 (diff)
downloadlinux-5d2bd7009f306c82afddd1ca4d9763ad8473c216.tar.xz
x86, fpu: decouple non-lazy/eager fpu restore from xsave
Decouple non-lazy/eager fpu restore policy from the existence of the xsave feature. Introduce a synthetic CPUID flag to represent the eagerfpu policy. "eagerfpu=on" boot paramter will enable the policy. Requested-by: H. Peter Anvin <hpa@zytor.com> Requested-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com> Link: http://lkml.kernel.org/r/1347300665-6209-2-git-send-email-suresh.b.siddha@intel.com Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
Diffstat (limited to 'Documentation/kernel-parameters.txt')
-rw-r--r--Documentation/kernel-parameters.txt4
1 files changed, 4 insertions, 0 deletions
diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index ad7e2e5088c1..741d064fdc6a 100644
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -1833,6 +1833,10 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
and restore using xsave. The kernel will fallback to
enabling legacy floating-point and sse state.
+ eagerfpu= [X86]
+ on enable eager fpu restore
+ off disable eager fpu restore
+
nohlt [BUGS=ARM,SH] Tells the kernel that the sleep(SH) or
wfi(ARM) instruction doesn't work correctly and not to
use it. This is also useful when using JTAG debugger.