x86: disable static NOPLs on 32 bits
On 32-bit, at least the generic nops are fairly reasonable, but the default nops for 64-bit really look pretty sad, and the P6 nops really do look better. So I would suggest perhaps moving the static P6 nop selection into the CONFIG_X86_64 thing. The alternative is to just get rid of that static nop selection, and just have two cases: 32-bit and 64-bit, and just pick obviously safe cases for them. Signed-off-by: H. Peter Anvin <hpa@zytor.com>
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@ -382,14 +382,17 @@ config X86_OOSTORE
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# P6_NOPs are a relatively minor optimization that require a family >=
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# 6 processor, except that it is broken on certain VIA chips.
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# Furthermore, AMD chips prefer a totally different sequence of NOPs
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# (which work on all CPUs). As a result, disallow these if we're
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# compiling X86_GENERIC but not X86_64 (these NOPs do work on all
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# x86-64 capable chips); the list of processors in the right-hand clause
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# are the cores that benefit from this optimization.
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# (which work on all CPUs). In addition, it looks like Virtual PC
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# does not understand them.
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#
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# As a result, disallow these if we're not compiling for X86_64 (these
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# NOPs do work on all x86-64 capable chips); the list of processors in
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# the right-hand clause are the cores that benefit from this optimization.
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#
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config X86_P6_NOP
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def_bool y
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depends on (X86_64 || !X86_GENERIC) && (M686 || MPENTIUMII || MPENTIUMIII || MPENTIUMM || MCORE2 || MPENTIUM4 || MPSC)
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depends on X86_64
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depends on (MCORE2 || MPENTIUM4 || MPSC)
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config X86_TSC
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def_bool y
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