diff options
| -rw-r--r-- | arch/x86/Kconfig.cpu | 11 |
1 files changed, 10 insertions, 1 deletions
diff --git a/arch/x86/Kconfig.cpu b/arch/x86/Kconfig.cpu index 86fd2a0e459..6d50064db18 100644 --- a/arch/x86/Kconfig.cpu +++ b/arch/x86/Kconfig.cpu @@ -377,9 +377,18 @@ config X86_OOSTORE def_bool y depends on (MWINCHIP3D || MWINCHIP2 || MWINCHIPC6) && MTRR +# +# P6_NOPs are a relatively minor optimization that require a family >= +# 6 processor, except that it is broken on certain VIA chips. +# Furthermore, AMD chips prefer a totally different sequence of NOPs +# (which work on all CPUs). As a result, disallow these if we're +# compiling X86_GENERIC but not X86_64 (these NOPs do work on all +# x86-64 capable chips); the list of processors in the right-hand clause +# are the cores that benefit from this optimization. +# config X86_P6_NOP def_bool y - depends on (M686 || MPENTIUMII || MPENTIUMIII || MPENTIUMM || MCORE2 || PENTIUM4) + depends on (X86_64 || !X86_GENERIC) && (M686 || MPENTIUMII || MPENTIUMIII || MPENTIUMM || MCORE2 || PENTIUM4) config X86_TSC def_bool y |