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| author | Andi Kleen <ak@suse.de> | 2007-04-24 13:05:37 +0200 |
|---|---|---|
| committer | Andi Kleen <andi@basil.nowhere.org> | 2007-04-24 13:05:37 +0200 |
| commit | 9ce883becb83190061369940de9c415595836c9b (patch) | |
| tree | 61f2a1717e7d46751559a3dc897c05de8dfdb6d5 /Documentation | |
| parent | cf6387daf8858bdcb3e123034ca422e8979d73f1 (diff) | |
| download | lwn-9ce883becb83190061369940de9c415595836c9b.tar.gz lwn-9ce883becb83190061369940de9c415595836c9b.zip | |
[PATCH] x86: Remove noreplacement option
noreplacement is dangerous on modern systems because it will not replace the
context switch FNSAVE with SSE aware FXSAVE. But other places in the kernel still assume
SSE and do FXSAVE and the CPU will then access FXSAVE information with
FNSAVE and cause corruption.
Easiest way to avoid this is to remove the option. It was mostly for paranoia
reasons anyways and alternative()s have been stable for some time.
Thanks to Jeremy F. for reporting and helping debug it.
Signed-off-by: Andi Kleen <ak@suse.de>
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/x86_64/boot-options.txt | 4 |
1 files changed, 0 insertions, 4 deletions
diff --git a/Documentation/x86_64/boot-options.txt b/Documentation/x86_64/boot-options.txt index 625a21db0c2a..85f51e5a749f 100644 --- a/Documentation/x86_64/boot-options.txt +++ b/Documentation/x86_64/boot-options.txt @@ -293,7 +293,3 @@ Debugging stuck (default) Miscellaneous - - noreplacement Don't replace instructions with more appropriate ones - for the CPU. This may be useful on asymmetric MP systems - where some CPUs have less capabilities than others. |